How to change a textview from a custom view's class

How to change a textview from a custom view's class - android

Let's say I have a custom view inside an activity and a TextView just below that custom view. I would like to change the TextView's text once the custom view was clicked but I seem to get a null pointer when I use findViewById(), so how can I do that?
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.yuvaleliav1gmail.quoridor_ye.MainActivity"
android:background="#dd7d23">
<com.yuvaleliav1gmail.quoridor_ye.ComBoardView
android:layout_width="900px"
android:layout_height="900px"
android:id="#+id/bview"
android:background="#drawable/game_board"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<RadioGroup
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/radioGroup"
android:layout_below="#+id/bview"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Move Pawn"
android:id="#+id/radioPawn"
android:checked="true"
android:onClick="radioButtonClick"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Set VERTICAL Wall"
android:id="#+id/verticalRdio"
android:checked="false"
android:onClick="radioButtonClick"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Set HORIZONTAL Wall"
android:id="#+id/horizontalRdio"
android:checked="false"
android:onClick="radioButtonClick"/>
</RadioGroup>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Your turn"
android:id="#+id/turnText34"
android:layout_gravity="center_horizontal"
android:layout_below="#+id/radioGroup"
android:layout_alignLeft="#+id/bview"
android:layout_alignStart="#+id/bview" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Your walls left: "
android:id="#+id/yourWallsText"
android:layout_gravity="center_horizontal"
android:layout_below="#+id/turnText34"
android:layout_alignLeft="#+id/turnText34"
android:layout_alignStart="#+id/turnText34" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="10"
android:id="#+id/yourNumText"
android:layout_gravity="center_horizontal"
android:layout_alignTop="#+id/yourWallsText"
android:layout_toRightOf="#+id/yourWallsText"
android:layout_toEndOf="#+id/yourWallsText" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Opponent&apos;s walls left:"
android:id="#+id/opWallsText"
android:layout_gravity="center_horizontal"
android:layout_below="#+id/yourWallsText"
android:layout_alignLeft="#+id/yourWallsText"
android:layout_alignStart="#+id/yourWallsText" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="10"
android:id="#+id/opNumText"
android:layout_gravity="center_horizontal"
android:layout_alignTop="#+id/opWallsText"
android:layout_toRightOf="#+id/opWallsText"
android:layout_toEndOf="#+id/opWallsText" />
</RelativeLayout>
comBoardView is the custom view's class
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.os.CountDownTimer;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.TextView;
import android.widget.Toast;
public class ComBoardView extends View {
private static final int ROWS = 9;
private static final int COLUMNS = 9;
public static Context con;
Paint paint;
GameService game;
TextView turns;
public static Point size = new Point();
/*
* constructor
*/
public ComBoardView(Context context, AttributeSet attrs) {
super(context, attrs);
con = context;
paint = new Paint();
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
display.getSize(size);
turns = (TextView) findViewById(R.id.turnText34);
}
/*
*/
public boolean onTouchEvent( MotionEvent event ) {
game = GameService.getInstance();
int x = (int)event.getX() / 100;
int y = (int)event.getY() / 100;
if ( event.getAction() != MotionEvent.ACTION_UP )
return true;
if(game.movePawn){
if(game.turn % 2 == 0){
if(game.isLegalMove(game.ai.MyLocation , y * ROWS + x)){
game.board.ClrPlayer(game.ai);
game.ai.MyLocation = y * ROWS + x;
game.board.SetPlayer(game.ai);
if(turns != null){
turns.setText("white's turn");
}
game.turn++;
}
}
else{
if(game.isLegalMove(game.player.MyLocation , y * ROWS + x)){
game.board.ClrPlayer(game.player);
game.player.MyLocation = y * ROWS + x;
game.board.SetPlayer(game.player);
if(turns != null){
turns.setText("black's turn");
}
game.turn++;
}
}
}
else {
if(((int)event.getX() % 100) < 50) x--;
if(((int)event.getY() % 100) < 50) y--;
if(game.setHWall){
game.board.SetHWall(y,x);
game.turn++;
}
else{
game.board.SetVWall(y,x);
game.turn++;
}
}
return true;
}
public void RestartTimer() {
new CountDownTimer(3500, 1000) {
public void onTick(long millisUntilFinished) {
final Toast toast = Toast.makeText(con, "restarting in: " + millisUntilFinished / 1000, Toast.LENGTH_LONG);
toast.show();
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
toast.cancel();
}
}, 1000);
}
public void onFinish() {
}
}.start();
}
protected void onDraw(Canvas canvas) {
paint.setAntiAlias(true);
paint.setColor(Color.BLACK);
GameService.getInstance().onDraw(canvas, paint);
}
}
and game is the activity's class
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.RadioButton;
import java.util.Timer;
public class Game extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game);
Timer timer = new Timer();
GameUpdateTimer ut = new GameUpdateTimer();
ut.boardView = (ComBoardView)this.findViewById(R.id.bview);
timer.schedule(ut, 200, 200);
RadioButton pawn = (RadioButton)findViewById(R.id.radioPawn);
RadioButton hWall = (RadioButton)findViewById(R.id.horizontalRdio);
RadioButton vWall = (RadioButton)findViewById(R.id.verticalRdio);
final GameService g = GameService.getInstance();
pawn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
g.movePawn = true;
g.setHWall = false;
}});
hWall.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
g.movePawn = false;
g.setHWall = true;
}
});
vWall.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
g.movePawn = false;
g.setHWall = false;
}
});
}
}

You can't call turns = (TextView) findViewById(R.id.turnText34); from your custom view, it will always return Null because TextView exist in the activity xml and not in ComBoardView.
What you can do, is to instantiate your TextView in the activity, then add a clickListener to your ComBoardView.
TextView turns;
#Override
protected void onCreate(Bundle savedInstanceState) {
//...
turns = (TextView) findViewById(R.id.turnText34);
ut.boardView.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
turns.setText("ComBoardView was clicked!");
}});
//...
}

Related

Surface View and Linear layout and onClick event

I have a problem with adding my surface view to a linear layout, I have tried the already available answers and still cant seem to figure it out. My aim is to render an animation at the bottom of my login screen when my the next button is clicked. I tried adding a linear Layout to the Screen and then adding my gameView object on to that.
This is the loginActivity and game View Class for clarity I've also added the xml.
`package com.example.Combat;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.*;
import android.os.Bundle;
import android.util.Log;
import android.view.*;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MyActivity extends Activity {
/**
* Called when the activity is first created.
*/
public GameView gameView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//setting the font
Typeface myTypeFace = Typeface.createFromAsset(getAssets(),"Typo Oxin free promo.ttf");
TextView myTextView = (TextView) findViewById(R.id.nameTextView);
myTextView.setTypeface(myTypeFace);
gameView = new GameView(this);
// LinearLayout.LayoutParams lp =new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
// lp.gravity= Gravity.BOTTOM;
LinearLayout myLayout = new LinearLayout(this);
myLayout.findViewById(R.id.gameLayoutView);
myLayout.addView(gameView);
}
#Override
public void onResume(){
super.onResume();
gameView.resume();
}
#Override
protected void onPause(){
super.onPause();
gameView.pause();
}
public void beginMotion(View view) {
GameView.isMoving=!GameView.isMoving;
// startActivity(new Intent(getApplicationContext(),transitionActivity.class));
}
}
`
package com.example.Combat;
import android.content.Context;
import android.graphics.*;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
/**
* Created by vmuser on 2017/05/05.
*/
public class GameView extends SurfaceView implements Runnable{
private Thread gameThread;
private SurfaceHolder ourHolder;
public static volatile boolean playing=false;
private Canvas canvas;
private Bitmap bitmapRunningMan;
public static boolean isMoving=false;
private float runSpeedPerSecond = 150;
//LinearLayout screen=(LinearLayout)findViewById(R.id.theScreen);
private float manXPos = 1020, manYPos = 950;
private int frameWidth = 230, frameHeight = 274;
private int frameCount = 6;
private int currentFrame = 0;
private long fps;
private long timeThisFrame;
private long lastFrameChangeTime = 0;
private int frameLengthInMillisecond = 60;
private Rect frameToDraw = new Rect(0, 0, frameWidth, frameHeight);
private RectF whereToDraw = new RectF(manXPos, manYPos, manXPos + frameWidth, frameHeight);
public GameView(Context context) {
super(context);
ourHolder = getHolder();
bitmapRunningMan = BitmapFactory.decodeResource(getResources(),
R.drawable.perfectsoldier);
bitmapRunningMan = Bitmap.createScaledBitmap(bitmapRunningMan,
frameWidth * frameCount, frameHeight, false);
}
#Override
public void run() {
while (playing) {
long startFrameTime = System.currentTimeMillis();
update();
this.draw();
Log.d("theOne","its Happennig");
timeThisFrame = System.currentTimeMillis() - startFrameTime;
if (timeThisFrame >= 1) {
fps = 1000 / timeThisFrame;
}
}
}
public void update() {
if (isMoving) {
manXPos = manXPos - runSpeedPerSecond / fps;
if (manXPos > 0) {
//manYPos += (int) frameHeight;
//manXPos = 10;
isMoving=false;
}
if (manYPos + frameHeight > 0) {
// manYPos = 10;
isMoving=false;
}
}
}
public void manageCurrentFrame() {
long time = System.currentTimeMillis();
if (isMoving) {
if (time > lastFrameChangeTime + frameLengthInMillisecond) {
lastFrameChangeTime = time;
currentFrame++;
if (currentFrame >= frameCount) {
currentFrame = 0;
}
}
}
frameToDraw.left = currentFrame * frameWidth;
frameToDraw.right = frameToDraw.left + frameWidth;
}
public void draw() {
if (ourHolder.getSurface().isValid()) {
canvas = ourHolder.lockCanvas();
canvas.drawColor(Color.WHITE);
whereToDraw.set((int) manXPos, (int) manYPos, (int) manXPos
+ frameWidth, (int) manYPos + frameHeight);
manageCurrentFrame();
canvas.drawBitmap(bitmapRunningMan, frameToDraw, whereToDraw, null);
ourHolder.unlockCanvasAndPost(canvas);
}
}
public void pause() {
playing = false;
try {
gameThread.join();
} catch(InterruptedException e) {
Log.e("ERR", "Joining Thread");
}
}
public void resume() {
playing = true;
gameThread = new Thread(this);
gameThread.start();
}
// public boolean onTouchEvent(MotionEvent event) {
// switch (event.getActionMasked() & MotionEvent.ACTION_MASK) {
// case MotionEvent.ACTION_DOWN :
// isMoving = !isMoving;
// break;
// }
//
// return true;
// }
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:focusableInTouchMode="true"
android:color="#000000"
android:weightSum="1" android:background="#ffffff" android:orientation="vertical"
android:id="#+id/theScreen">
<ImageView
android:layout_width="113dp"
android:layout_height="130dp"
android:src="#drawable/thelogo"
android:id="#+id/imageView" android:layout_gravity="center_horizontal"/>
<TextView
android:layout_width="145dp"
android:layout_height="49dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="combat"
android:textSize="30sp"
android:textColor="#000000"
android:id="#+id/nameTextView" android:layout_gravity="right" android:layout_weight="0.06"/>
<EditText
android:layout_width="270dp"
android:layout_height="wrap_content"
android:hint="Username"
android:textColorHint="#808080"
android:textColor="#22272a"
android:id="#+id/userNameEditText" android:layout_gravity="center_horizontal"/>
<Button
android:layout_width="261dp"
android:layout_height="wrap_content"
android:text="Next"
android:drawableRight="#drawable/thearrow"
android:textColor="#000000"
android:onClick="beginMotion"
android:id="#+id/NextButton" android:layout_gravity="center_horizontal" android:background="#638455"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Create an account"
android:id="#+id/textView" android:layout_gravity="center_horizontal" android:layout_weight="0.07"
android:textColor="#22272A"/>
<LinearLayout
android:id="#+id/gameLayoutView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
>
</LinearLayout>
</LinearLayout>

You haven't attached myLayout to the activity main layout that you earlier set on setContentView(R.layout.main).
Instead of:
LinearLayout myLayout = new LinearLayout(this);
myLayout.findViewById(R.id.gameLayoutView);
myLayout.addView(gameView);
You should write this:
LinearLayout myLayout = (LinearLayout) findViewById(R.id.gameLayoutView);
myLayout.addView(gameView);

ExpandableLayout not working in android 6

I'm using ExpandableLayout from this library :
https://github.com/traex/ExpandableLayout
its work good , but in android 6 it does not work ! just show my data and Non-clickable layout .
i input library in my project
here is the Codes library i use it:
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Build;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.Transformation;
import android.widget.FrameLayout;
import android.widget.RelativeLayout;
public class ExpandableLayout extends RelativeLayout
{
private Boolean isAnimationRunning = false;
private Boolean isOpened = false;
private Integer duration;
private FrameLayout contentLayout;
private FrameLayout headerLayout;
private Animation animation;
public ExpandableLayout(Context context)
{
super(context);
}
public ExpandableLayout(Context context, AttributeSet attrs)
{
super(context, attrs);
init(context, attrs);
}
public ExpandableLayout(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
init(context, attrs);
}
private void init(final Context context, AttributeSet attrs)
{
final View rootView = View.inflate(context, R.layout.view_expandable, this);
headerLayout = (FrameLayout) rootView.findViewById(R.id.view_expandable_headerlayout);
final TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.ExpandableLayout);
final int headerID = typedArray.getResourceId(R.styleable.ExpandableLayout_el_headerLayout, -1);
final int contentID = typedArray.getResourceId(R.styleable.ExpandableLayout_el_contentLayout, -1);
contentLayout = (FrameLayout) rootView.findViewById(R.id.view_expandable_contentLayout);
if (headerID == -1 || contentID == -1)
throw new IllegalArgumentException("HeaderLayout and ContentLayout cannot be null!");
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.CUPCAKE) {
if (isInEditMode())
return;
}
duration = typedArray.getInt(R.styleable.ExpandableLayout_el_duration, getContext().getResources().getInteger(android.R.integer.config_shortAnimTime));
final View headerView = View.inflate(context, headerID, null);
headerView.setLayoutParams(new ViewGroup.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
headerLayout.addView(headerView);
final View contentView = View.inflate(context, contentID, null);
contentView.setLayoutParams(new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
contentLayout.addView(contentView);
contentLayout.setVisibility(GONE);
headerLayout.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v)
{
if (!isAnimationRunning)
{
if (contentLayout.getVisibility() == VISIBLE)
collapse(contentLayout);
else
expand(contentLayout);
isAnimationRunning = true;
new Handler().postDelayed(new Runnable()
{
#Override
public void run()
{
isAnimationRunning = false;
}
}, duration);
}
}
});
typedArray.recycle();
}
private void expand(final View v)
{
v.measure(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
final int targetHeight = v.getMeasuredHeight();
v.getLayoutParams().height = 0;
v.setVisibility(VISIBLE);
animation = new Animation()
{
#Override
protected void applyTransformation(float interpolatedTime, Transformation t)
{
if (interpolatedTime == 1)
isOpened = true;
v.getLayoutParams().height = (interpolatedTime == 1) ? LayoutParams.WRAP_CONTENT : (int) (targetHeight * interpolatedTime);
v.requestLayout();
}
#Override
public boolean willChangeBounds() {
return true;
}
};
animation.setDuration(duration);
v.startAnimation(animation);
}
private void collapse(final View v)
{
final int initialHeight = v.getMeasuredHeight();
animation = new Animation()
{
#Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
if(interpolatedTime == 1)
{
v.setVisibility(View.GONE);
isOpened = false;
}
else{
v.getLayoutParams().height = initialHeight - (int)(initialHeight * interpolatedTime);
v.requestLayout();
}
}
#Override
public boolean willChangeBounds() {
return true;
}
};
animation.setDuration(duration);
v.startAnimation(animation);
}
public Boolean isOpened()
{
return isOpened;
}
public void show()
{
if (!isAnimationRunning)
{
expand(contentLayout);
isAnimationRunning = true;
new Handler().postDelayed(new Runnable()
{
#Override
public void run()
{
isAnimationRunning = false;
}
}, duration);
}
}
public FrameLayout getHeaderLayout()
{
return headerLayout;
}
public FrameLayout getContentLayout()
{
return contentLayout;
}
public void hide()
{
if (!isAnimationRunning)
{
collapse(contentLayout);
isAnimationRunning = true;
new Handler().postDelayed(new Runnable()
{
#Override
public void run()
{
isAnimationRunning = false;
}
}, duration);
}
}
#Override
public void setLayoutAnimationListener(Animation.AnimationListener animationListener) {
animation.setAnimationListener(animationListener);
}
}
and where i use this library
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<expandablelayout.library.ExpandableLayout
xmlns:expandable="http://schemas.android.com/apk/res-auto"
android:id="#+id/firstshahr"
android:layout_width="match_parent"
android:layout_height="wrap_content"
expandable:el_headerLayout="#layout/view_headershahr"
expandable:el_contentLayout="#layout/view_contentshahr"
android:layout_marginBottom="10dp"
/>
<expandablelayout.library.ExpandableLayout
android:id="#+id/firststar"
xmlns:expandable="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
expandable:el_headerLayout="#layout/view_headerstar"
expandable:el_contentLayout="#layout/view_contentstar"
android:layout_marginBottom="10dp"
/>
<expandablelayout.library.ExpandableLayout
android:id="#+id/firsttarikh"
xmlns:expandable="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
expandable:el_headerLayout="#layout/view_headertarikh"
expandable:el_contentLayout="#layout/view_contenttarikh"
android:layout_marginBottom="10dp"
/>
<expandablelayout.library.ExpandableLayout
android:id="#+id/firstghaza"
android:layout_width="match_parent"
android:layout_height="wrap_content"
expandable:el_headerLayout="#layout/view_headerghaza"
expandable:el_contentLayout="#layout/view_contentghaza"
android:layout_marginBottom="10dp"
/>
<expandablelayout.library.ExpandableLayout
android:id="#+id/firsthavapeymaei"
android:layout_width="match_parent"
android:layout_height="wrap_content"
expandable:el_headerLayout="#layout/view_headerhavapeymaei"
expandable:el_contentLayout="#layout/view_contenthavapeyaei"
android:layout_marginBottom="10dp"
/>
<expandablelayout.library.ExpandableLayout
android:id="#+id/firstmodat"
android:layout_width="match_parent"
android:layout_height="wrap_content"
expandable:el_headerLayout="#layout/view_headermodat"
expandable:el_contentLayout="#layout/view_contentmodat"
android:layout_marginBottom="10dp"
/>
</LinearLayout>
view_headerstar.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="40dp"
android:id="#+id/header_text"
android:gravity="right"
android:contextClickable="true">
<TextView
android:id="#+id/turlahzeakhari"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:text="درجه هتل"
android:textColor="#ffffff"
android:textStyle="bold" />
<ImageView
android:id="#+id/tour_index"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:src="#mipmap/archive_star"
/>
</LinearLayout>
<ImageView
android:id="#+id/tour_index55"
android:layout_width="14dp"
android:layout_height="14dp"
android:src="#mipmap/archive_fp"
android:layout_gravity="left"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="10dp"
android:layout_marginTop="15dp"/>
</RelativeLayout>
view_contentstar.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/re12"
>
<ListView
android:paddingBottom="10dp"
android:id="#+id/listfilter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginTop="0dp"
android:divider="#color/list_divider"
android:dividerHeight="0dp"
android:gravity="right"
android:layoutDirection="rtl"
android:listSelector="#drawable/list_row_selector"
android:textAlignment="gravity"
android:textDirection="rtl" >
</ListView>
</RelativeLayout>

Check this It is very simple and useful!

Custom view is being displayed as nested views in Component Tree

I have created custom view which extends FrameLayout. After adding it into RelativeLayout it's being displayed as two nested views:
Is it normal? It sometimes messes up with wrap_content flags but I couldn't figure out why. When I use View as a base class everything looks normal.
Here is my code:
MainActivity.java
package com.example.app;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.SeekBar;
import com.codersmill.tset.R;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.example.app.RateBar
android:layout_width="match_parent"
android:layout_height="48dp"
android:id="#+id/rateBar"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"/>
</RelativeLayout>
RateBar.java
package com.example.app;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.TextView;
import com.codersmill.tset.R;
public class RateBar extends FrameLayout {
TextView star1, star2, star3, star4, star5;
View dot;
private boolean isAnimating = false;
int radius = 36;
private int step = 100;
private int leftMargin = 50;
private int topMargin = 0;
private int currentPosition = 0;
public RateBar(Context context) {
this(context, null);
}
public RateBar(Context context, AttributeSet attrs) {
super(context, attrs);
View.inflate(context, R.layout.view_rate_bar, this);
star1 = (TextView) this.findViewById(R.id.star1);
star2 = (TextView) this.findViewById(R.id.star2);
star3 = (TextView) this.findViewById(R.id.star3);
star4 = (TextView) this.findViewById(R.id.star4);
star5 = (TextView) this.findViewById(R.id.star5);
star1.setOnClickListener(onClickListener);
star2.setOnClickListener(onClickListener);
star3.setOnClickListener(onClickListener);
star4.setOnClickListener(onClickListener);
star5.setOnClickListener(onClickListener);
dot = this.findViewById(R.id.selector);
}
public RateBar(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs);
}
private OnClickListener onClickListener = new OnClickListener() {
#Override public void onClick(View v) {
if(isAnimating) return;
switch (v.getId()) {
case R.id.star1:
animateToPosition(0);
break;
case R.id.star2:
animateToPosition(1);
break;
case R.id.star3:
animateToPosition(2);
break;
case R.id.star4:
animateToPosition(3);
break;
case R.id.star5:
animateToPosition(4);
break;
}
}
};
#Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
step = (int) (getMeasuredWidth() / 5.0f);
leftMargin = (int) (step / 2.0f - radius);
topMargin = (int) (getMeasuredHeight() / 2.0f - radius);
if(!isAnimating) {
FrameLayout.LayoutParams params = (LayoutParams) dot.getLayoutParams();
params.leftMargin = leftMargin + currentPosition * step;
params.topMargin = topMargin;
dot.setLayoutParams(params);
}
}
private void animateToPosition(final int position) {
final int from = currentPosition*step + leftMargin;
final int to = position*step + leftMargin;
ValueAnimator animation = ValueAnimator.ofInt(from, to);
animation.setDuration(250);
animation.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
#Override public void onAnimationUpdate(ValueAnimator animation) {
FrameLayout.LayoutParams params = (LayoutParams) dot.getLayoutParams();
params.leftMargin = (int) animation.getAnimatedValue();
params.topMargin = topMargin;
dot.setLayoutParams(params);
}
});
animation.addListener(new AnimatorListenerAdapter() {
#Override public void onAnimationStart(Animator animation) {
super.onAnimationStart(animation);
isAnimating = true;
FrameLayout.LayoutParams params = (LayoutParams) dot.getLayoutParams();
params.topMargin = topMargin;
params.leftMargin = currentPosition * step + leftMargin;
dot.setLayoutParams(params);
}
#Override public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
isAnimating = false;
currentPosition = position;
FrameLayout.LayoutParams params = (LayoutParams) dot.getLayoutParams();
params.leftMargin = currentPosition * step + leftMargin;
params.topMargin = topMargin;
dot.setLayoutParams(params);
}
});
animation.start();
}
private void updateDotPosition() {
}
}
view_rate_bar.xml
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="wrap_content">
<View
android:id="#+id/selector"
android:layout_width="24dp"
android:layout_height="24dp"
android:background="#drawable/oval"
/>
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="1"
android:id="#+id/star1"
android:layout_weight="1"
android:gravity="center"
android:padding="12dp"
android:background="#2200ff00"/>
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="2"
android:id="#+id/star2"
android:layout_weight="1"
android:gravity="center"
android:padding="12dp"
android:background="#22ff0000"/>
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="3"
android:id="#+id/star3"
android:layout_weight="1"
android:gravity="center"
android:padding="12dp"
android:background="#2200ff00"/>
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="4"
android:id="#+id/star4"
android:layout_weight="1"
android:gravity="center"
android:padding="12dp"
android:background="#22ff0000"/>
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="5"
android:id="#+id/star5"
android:layout_weight="1"
android:gravity="center"
android:padding="12dp"
android:background="#2200ff00" />
</LinearLayout>
</merge>

even i was facing the same issue, it appears that new version of android studio comes up with two files content_main.xml and activity_mail.xml , when we select Activity_main.xml>Design view everything appears 'Custom View' , instead when we highlight content_main.xml>Design, everything is bac to normal. I dont know why it happens but that;s how i fix mine ( android nooob here )
More can be found here : https://teamtreehouse.com/community/i-cant-drag-widgets-onto-the-phone-mockup-component-tree-shows-customview-instead-of-the-relative-view-help

Textview alignment with seekbar

I have a seekbar above which i have a placed a textview which displays the value of the seekbar movement. My problem is the alignment of the Textview and the Seekbar initially are same but as dragging the alignment changes i have attached screen shots and code.
XML File
</LinearLayout>
<RelativeLayout
android:id="#+id/sliderAndPoints_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:gravity="top"
android:orientation="horizontal" >
<TextView
android:id="#+id/tv_minBonApps"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="5dp"
android:text="0" />
<TextView
android:id="#+id/tv_max_BonApps"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:text="7000" />
<SeekBar
android:id="#+id/sb_changes"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_toLeftOf="#+id/tv_max_BonApps"
android:layout_toRightOf="#+id/tv_minBonApps"
android:max="70"
android:maxHeight="2dip"
android:paddingLeft="8dp"
android:progressDrawable="#drawable/seek_bar"
android:thumb="#drawable/panier_vide_btn" />
</RelativeLayout>
</LinearLayout>
Java File
seekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
#Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
#Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
#SuppressLint("NewApi")
#Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
// TODO Auto-generated method stub
currentBonsPoints = progress * 100;
if (progress < 3500) {
int xPos = (((seekbar.getRight() - seekbar.getLeft()) * seekbar
.getProgress()) / seekbar.getMax())
+ seekbar.getLeft();
layout_bouns.setPadding(xPos - 25, 0, 0, 0);
bonsCount.setText("" + (progress * 100));
} else if (progress >= 3500 && progress < 4900) {
int xPos = (((seekbar.getRight() - seekbar.getLeft()) * seekbar
.getProgress()) / seekbar.getMax())
+ seekbar.getLeft();
layout_bouns.setPadding(xPos - 34, 0, 0, 0);
bonsCount.setText("" + (progress * 100));
} else {
int xPos = (((seekbar.getRight() - seekbar.getLeft()) * seekbar
.getProgress()) / seekbar.getMax())
+ seekbar.getLeft();
layout_bouns.setPadding(xPos - 37, 0, 0, 0);
bonsCount.setText("" + (progress * 100));
}
}
});

package com.example.seekbarwithtextviewsample;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.AbsoluteLayout;
import android.widget.SeekBar;
import android.widget.TextView;
public class MainActivity extends Activity {
TextView mTxvSeekBarValue;
SeekBar mSkbSample;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTxvSeekBarValue = (TextView) this.findViewById(R.id.txvSeekBarValue);
mSkbSample = (SeekBar) this.findViewById(R.id.skbSample);
mSkbSample.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_DOWN)
{
ShowSeekValue((int)event.getX(), mTxvSeekBarValue.getTop());
mTxvSeekBarValue.setVisibility(View.VISIBLE);
}
else if(event.getAction() == MotionEvent.ACTION_MOVE)
{
ShowSeekValue((int)event.getX(), mTxvSeekBarValue.getTop());
}
else if(event.getAction() == MotionEvent.ACTION_UP)
{
mTxvSeekBarValue.setVisibility(View.INVISIBLE);
}
return false;
}
});
}
private void ShowSeekValue(int x, int y)
{
if(x > 0 && x < mSkbSample.getWidth())
{
AbsoluteLayout.LayoutParams lp = new AbsoluteLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, x, y);
mTxvSeekBarValue.setLayoutParams(lp);
mTxvSeekBarValue.setText(""+mSkbSample.getProgress());
}
}
}
and in the layout
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<!-- Main context -->
<LinearLayout android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<SeekBar android:id="#+id/skbSample"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dip"
android:layout_marginRight="10dip"
android:layout_marginTop="25dp"
android:max="10000">
</SeekBar>
</LinearLayout>
<!-- For display value -->
<AbsoluteLayout android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="#+id/txvSeekBarValue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FFFFFFFF"
android:background="#drawable/infowindow"
>
</TextView>
</AbsoluteLayout>
</RelativeLayout>
You will get what you are looking for...

how to clear view in android?

I have created a simple demo application in android for drawing ,now can any one say me how can i remove view and clear screen in just one click .I have tried as below:please help me to do it....thanx in advance..!
main.java
package com.example.singletouch;
import com.example.singletouch.R.attr;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
public class MainActivity extends Activity {
ImageView pen;
SingleTouchView mDrawView;
ImageView remove;
LinearLayout pens;
LinearLayout pen1, pen2, pen3, pen4;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mDrawView = (SingleTouchView) findViewById(R.id.myview);
pen = (ImageView) findViewById(R.id.pen);
pens = (LinearLayout) findViewById(R.id.linear);
pens.setVisibility(View.GONE);
pen1 = (LinearLayout) findViewById(R.id.pen1);
pen2 = (LinearLayout) findViewById(R.id.pen2);
pen3 = (LinearLayout) findViewById(R.id.pen3);
pen4 = (LinearLayout) findViewById(R.id.pen4);
remove=(ImageView)findViewById(R.id.remove);
/*
* pen1.setOnClickListener(this); pen2.setOnClickListener(this);
* pen3.setOnClickListener(this); pen4.setOnClickListener(this);
*/
pen.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
pens.setVisibility(View.VISIBLE);
}
});pens.setVisibility(View.GONE);
pen1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
mDrawView.setPen(SingleTouchView.DrawingPens.PEN_1);
pens.setVisibility(View.GONE);
}
});
pen2.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
mDrawView.setPen(SingleTouchView.DrawingPens.PEN_2);
pens.setVisibility(View.GONE);
}
});
pen3.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
pens.setVisibility(View.GONE);
mDrawView.setPen(SingleTouchView.DrawingPens.PEN_3);
}
});
pen4.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
pens.setVisibility(View.GONE);
mDrawView.setPen(SingleTouchView.DrawingPens.PEN_4);
}
});
remove.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
}
});
}
}
SingleTouchView.java
package com.example.singletouch;
import java.util.AbstractMap;
import java.util.Map;
import java.util.concurrent.ConcurrentLinkedQueue;
import android.R.color;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff.Mode;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.Switch;
public class SingleTouchView extends View{
public int width;
public int height;
public Bitmap mBitmap;
public Canvas mCanvas;
public Path mPath;
public Paint mBitmapPaint;
Context context;
public Paint circlePaint;
public Path circlePath;
public enum DrawingPens {
PEN_1(6),
PEN_2(4),
PEN_3(2),
PEN_4(1);
final public Paint mPaint;
/**
* Constructor
*
* #param width width of stroke
* #param color color of stroke
*/
private DrawingPens(final int width) {
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setStrokeWidth(width);
//mPaint.setColor(color);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
}
/**
* #return corresponding paint
*/
Paint getPaint() {
return mPaint;
}
}
public SingleTouchView(final Context context) {
super(context);
init(context);
}
public SingleTouchView(final Context context, final AttributeSet attrs) {
super(context, attrs);
init(context);
}
public SingleTouchView(final Context context, final AttributeSet attrs, final int defStyle) {
super(context, attrs, defStyle);
init(context);
}
/** To store Paint - Path relation */
// TODO: depending on exact limits, more optimal ways can be found
private ConcurrentLinkedQueue<Map.Entry<Path, DrawingPens>> mPaths = new ConcurrentLinkedQueue<Map.Entry<Path, DrawingPens>>();
/** Cached current path, <b>NOTE:</b> this field is tail at mPaths and is used it only for caching, not drawing */
private Path mCurrentPath;
/**
* Inits internal views data, should be called from every constructor
*
* #param context {#link Context}
*/
private void init(final Context context) {
/* TODO: if some values of paints cannot be determined in static context (in enum),
then Paints should be created here and used via EnumMap */
// Initial pen
setPen(DrawingPens.PEN_1);
}
#Override
public void onDraw(Canvas canvas){
// just to draw background
super.onDraw(canvas);
// Draw all paths
for (Map.Entry<Path, DrawingPens> entry : mPaths) {
canvas.drawPath(entry.getKey(), entry.getValue().getPaint());
}
}
#Override
public boolean onTouchEvent(MotionEvent me){
float eventX = me.getX();
float eventY = me.getY();
switch (me.getAction()) {
case MotionEvent.ACTION_DOWN:
mCurrentPath.moveTo(eventX, eventY);
return true;
case MotionEvent.ACTION_MOVE:
mCurrentPath.lineTo(eventX, eventY);
break;
case MotionEvent.ACTION_UP:
break;
}
invalidate();
return true;
}
/**
* Setter for new pen
*
* #param pen {#link DrawingPens} to be used for next drawing
*/
public void setPen(final DrawingPens pen) {
// put latest item to the queue
mCurrentPath = new Path();
mPaths.add(new AbstractMap.SimpleImmutableEntry<Path, DrawingPens>(mCurrentPath, pen));
}
public void clear(View v){
}
}
main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:context=".MainActivity" >
<com.example.singletouch.SingleTouchView
android:id="#+id/myview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_above="#+id/pen" />
<LinearLayout
android:id="#+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#drawable/menubar"
android:padding="2dp"
android:weightSum="4" >
<ImageView
android:id="#+id/pen"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:layout_weight="1"
android:gravity="center"
android:src="#drawable/pen" />
<ImageView
android:id="#+id/eraser"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:layout_weight="1"
android:src="#drawable/eraser" />
<ImageView
android:id="#+id/color"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:layout_weight="1"
android:src="#drawable/color" />
<ImageView
android:id="#+id/remove"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:layout_weight="1"
android:src="#drawable/remove" />
</LinearLayout>
<LinearLayout
android:id="#+id/linear"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_above="#+id/linearLayout1"
android:layout_alignParentLeft="true"
android:background="#eeeeee"
android:orientation="horizontal"
android:visibility="gone"
android:weightSum="4" >
<LinearLayout
android:id="#+id/pen1"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center" >
<ImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:src="#drawable/pen1" />
</LinearLayout>
<LinearLayout
android:id="#+id/pen2"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:src="#drawable/pen2" />
</LinearLayout>
<LinearLayout
android:id="#+id/pen3"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:src="#drawable/pen3" />
</LinearLayout>
<LinearLayout
android:id="#+id/pen4"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:src="#drawable/pen4" />
</LinearLayout>
</LinearLayout>
</RelativeLayout>

Jus use ...
mCanvas.drawColor(Color.BLACK);
... for clearing the canvas or any other color you want to have in background. E.g.
remove.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// clear canvas contents
mCanvas.drawColor(Color.BLACK);
// create new path list; old one will be garbage collected
ConcurrentLinkedQueue<Map.Entry<Path, DrawingPens>> mPaths =
new ConcurrentLinkedQueue<Map.Entry<Path, DrawingPens>>();
pens.setVisibility(View.VISIBLE);
}
p.s.: for removing a view dynamically from its container use removeView(....), e.g.
((ViewGroup)viewToRemove.getParent()).removeView(viewToRemove);
Hope this helps ... Cheers!

remove.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
layout.removeView(mDrawView);
mDrawView = new SingleTouchView(MainActivity.this);
layout.addView(mDrawView);
}
});

Put the portion of the screen you want cleared in a single layout in xml eg
<RelativeLayout
android:id="#+id/layout"
android:layout_width="wrap_content"
android:layout_height= "wrap_content">
The Views that have to be gone on click
</RelativeLayout>
Then in your code in onClick() of the button give
((RelativeLayout) findViewById(R.id.layout)).setVisiblity(View.GONE));
EDIT :
If you want the ImageView cleared use :
((ImageView) findViewById(R.id.imageView)).setImageDrawable(null);

instead of drawing solid color you can draw transparent color this help you don't cover the other views if you use them as a background for the canvas
mCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
I got this from this answer: https://stackoverflow.com/a/10882301/8113211

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

How to change a textview from a custom view's class - android

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