Develop Reference

Custom EditText settext does not set the text

I am using a custom edittext but the problem is that I am unable to set a text for my custom edittext. Here is what all I tried from the available answers on SO,
setText not working for a Custom Edittext
This did not work still. I did not get any error,so no clued why it did not work.
Custom TextView - setText() called before constructor
This also did not work.
XML FILE
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:background="#FFFFFF"
android:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin" >
<com.random.practiceproject.LinedEditText
android:layout_width="301dp"
android:inputType="text"
android:layout_height="match_parent" />
</LinearLayout>
MainActivity
LinedEditText lt;
EditText et; //Normal edittext works
String s = "This is a sample string";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lt = new LinedEditText(this);
et = (EditText) findViewById(R.id.newt);
lt.setCursorVisible(true);
lt.setTextColor(Color.BLACK);
lt.setText(s,TextView.BufferType.EDITABLE);
et.setText(s, TextView.BufferType.EDITABLE);
}
Here is the code,
public class LinedEditText extends EditText {
private static Paint linePaint;
static {
linePaint = new Paint();
linePaint.setColor(Color.BLACK);
linePaint.setStyle(Paint.Style.STROKE);
}
public LinedEditText(Context context)
{
super(context);
}
public LinedEditText(Context context, AttributeSet attributes) {
super(context, attributes);
}
#Override
protected void onDraw(Canvas canvas) {
Rect bounds = new Rect();
int firstLineY = getLineBounds(0, bounds);
/*int firstLineY=0;
for(int i =0;i<getLineCount();i++)
{
firstLineY = (i + 1) * getLineHeight();
}*/
int lineHeight = getLineHeight();
int totalLines = Math.max(getLineCount(), getHeight() / lineHeight);
for (int i = 0; i < totalLines; i++) {
int lineY = firstLineY + i * lineHeight;
canvas.drawLine(bounds.left, lineY, bounds.right, lineY, linePaint);
}
super.onDraw(canvas);
}
}

The problem is that you create new instance of LineEditText in onCreate and working with it, but not adding to layout. In the layout there is another instance of LineEditText, that you don't use.
So you must either replace:
lt = new LinedEditText(this);
with:
lt = (LinedEditText) findViewById(/*provide your id*/)
or you need to add lt to layout through ViewGroup.addView(), but I think you need to use first variant.

Android Floating Button not showing

I try to make drawing page with canvas and add floating button in corner for some actions. But it is not appearing.
This is my classes
DrawView.java
public class DrawView extends View implements View.OnTouchListener {
private List<Point> points = new ArrayList<>();
private Paint paint = new Paint();
public DrawView(Context c) {
super(c);
setFocusable(true);
setFocusableInTouchMode(true);
this.setOnTouchListener(this);
paint.setColor(Color.BLACK);
}
#Override
public void onDraw(Canvas canvas) {
for (Point point : points) {
canvas.drawCircle(point.x, point.y, 30, paint);
}
}
public boolean onTouch(View view, MotionEvent event) {
Point point = new Point();
point.x = event.getX();
point.y = event.getY();
points.add(point);
invalidate();
return true;
}}
And Main activity
public class DrawingPage extends AppCompatActivity {
private DrawView drawView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_drawing_page);
drawView = new DrawView(getApplicationContext());
drawView.setBackgroundColor(Color.WHITE);
setContentView(drawView);
drawView.requestFocus();
}}
XML
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
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="reminder.com.picsartdrawing.DrawingPage">
<android.support.design.widget.FloatingActionButton
android:id="#+id/myFAB"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#mipmap/ic_launcher"
app:elevation="4dp"
android:layout_alignParentBottom="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>
But floating button is not appearing, any solutions?
Screenshot
EDIT!!!
in Activity's onCreate method I have changed this, and now I have drawing canvas page with button.
RelativeLayout layout = (RelativeLayout) findViewById(R.id.layout);
drawView = new DrawView(getApplicationContext());
drawView.setBackgroundColor(Color.WHITE);
drawView.requestFocus();
assert layout != null;
layout.addView(drawView);

In onCreate() you replace 2 times with setContentView() the "main" view, so try with only this:
setContentView(R.layout.activity_drawing_page);

You need to add this in the onCreate method of your activity class:
FloatingActionButton fab = (FloatingActionButton) findViewById (R.id.fab);
fab.setOnClickListener (new View.OnClickListener () {
#Override
public void onClick (View view) {
Snackbar.make (view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction ("Action", null).show ();
}
});

Android Translate Animation like Swapping Two Views

I'm trying to simulate swapping two views (one goes up and ones go down) with Translate animation.
Basically, it swaps and re-swap again.
This is my activity.
LinearLayout topView, belowView;
TextView foo, bar;
int viewHeight;
boolean noSwap = true;
private static int ANIMATION_DURATION = 3000;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_slide);
topView = (LinearLayout) findViewById(R.id.top_view);
belowView = (LinearLayout) findViewById(R.id.below_view);
foo = (TextView) findViewById(R.id.foo);
bar = (TextView) findViewById(R.id.bar);
ImageButton btnSwitch = (ImageButton) findViewById(R.id.switch_btn);
ViewTreeObserver viewTreeObserver = foo.getViewTreeObserver();
if (viewTreeObserver.isAlive()) {
viewTreeObserver.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
foo.getViewTreeObserver().addOnGlobalLayoutListener(this);
viewHeight = foo.getHeight();
foo.getLayoutParams();
}
});
}
btnSwitch.setOnClickListener(new View.OnClickListener() {
#Override public void onClick(View v) {
if (noSwap) {
//Log.d("Swap Status", "Not Swapping yet ? " + true);
TranslateAnimation ta1 = new TranslateAnimation(0, 0, 0, viewHeight);
ta1.setDuration(ANIMATION_DURATION);
ta1.setFillAfter(true);
topView.startAnimation(ta1);
topView.bringToFront();
belowView.setY(0);
TranslateAnimation ta2 = new TranslateAnimation(0, 0, 0, -viewHeight);
ta2.setDuration(ANIMATION_DURATION);
ta2.setFillAfter(true);
belowView.startAnimation(ta2);
belowView.bringToFront();
noSwap = false;
} else {
//Log.d("Swap Status", "Swapped already ? " + true);
TranslateAnimation ta1 = new TranslateAnimation(0, 0, viewHeight, 0);
ta1.setDuration(ANIMATION_DURATION);
ta1.setFillAfter(true);
topView.startAnimation(ta1);
topView.bringToFront();
belowView.setY(0);
TranslateAnimation ta2 = new TranslateAnimation(0, 0, 0, viewHeight);
ta2.setDuration(ANIMATION_DURATION);
ta2.setFillAfter(true);
belowView.startAnimation(ta2);
belowView.bringToFront();
noSwap = true;
}
}
});
}
This is the layout.
<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="${packageName}.${activityClass}">
<LinearLayout
android:id="#+id/top_view"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/foo"
android:text="#string/foo"
android:textSize="30sp"
android:textColor="#android:color/holo_purple"
android:padding="10dp"
android:fontFamily="sans-serif-condensed"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:id="#+id/below_view"
android:layout_below="#+id/top_view"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/bar"
android:text="#string/bar"
android:textSize="30sp"
android:textColor="#android:color/holo_red_light"
android:padding="10dp"
android:fontFamily="sans-serif-condensed"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<ImageButton android:id="#+id/switch_btn"
style="?android:borderlessButtonStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:src="#drawable/ic_action_import_export"
android:contentDescription="#string/swap"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"/>
</RelativeLayout>
Everything seems fine until I click the Switch button for third times when the top view is supposed to go down and below view is to go up. But the starting position of the below view is not correct. I've tried setting several positions to below view but still can't get it right.
I've made a screencast about it here.

I think I get it right. Here's the working class.
LinearLayout topView, belowView;
TextView foo, bar;
int viewHeight;
boolean noSwap = true;
private static int ANIMATION_DURATION = 300;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_slide);
topView = (LinearLayout) findViewById(R.id.top_view);
belowView = (LinearLayout) findViewById(R.id.below_view);
foo = (TextView) findViewById(R.id.foo);
bar = (TextView) findViewById(R.id.bar);
ImageButton btnSwitch = (ImageButton) findViewById(R.id.switch_btn);
ViewTreeObserver viewTreeObserver = foo.getViewTreeObserver();
if (viewTreeObserver.isAlive()) {
viewTreeObserver.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
foo.getViewTreeObserver().addOnGlobalLayoutListener(this);
viewHeight = foo.getHeight();
foo.getLayoutParams();
}
});
}
btnSwitch.setOnClickListener(new View.OnClickListener() {
#Override public void onClick(View v) {
if (noSwap) {
TranslateAnimation ta1 = new TranslateAnimation(0, 0, 0, viewHeight);
ta1.setDuration(ANIMATION_DURATION);
ta1.setFillAfter(true);
topView.startAnimation(ta1);
topView.bringToFront();
TranslateAnimation ta2 = new TranslateAnimation(0, 0, 0, -viewHeight);
ta2.setDuration(ANIMATION_DURATION);
ta2.setFillAfter(true);
belowView.startAnimation(ta2);
belowView.bringToFront();
noSwap = false;
} else {
TranslateAnimation ta1 = new TranslateAnimation(0, 0, viewHeight, 0);
ta1.setDuration(ANIMATION_DURATION);
ta1.setFillAfter(true);
topView.startAnimation(ta1);
topView.bringToFront();
TranslateAnimation ta2 = new TranslateAnimation(0, 0, -viewHeight, 0);
ta2.setDuration(ANIMATION_DURATION);
ta2.setFillAfter(true);
belowView.startAnimation(ta2);
belowView.bringToFront();
noSwap = true;
}
}
});
}

How to instantiate a view inside a Frame layout?

This is my MainActivity:
public class MainActivity extends Activity {
PieMenu pieMenu;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pieMenu = new PieMenu(getApplicationContext());
}
#Override
public boolean onTouchEvent(MotionEvent event) {
int x = (int)event.getX();
int y = (int)event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
{
pieMenu.addPieMenu(x,y);
}
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
}
return false;
}
}
PieMenu:
public class PieMenu extends FrameLayout{
private Context _context;
public PieMenu(Context context) {
super(context);
_context = context;
// TODO Auto-generated constructor stub
}
public void addPieMenu(int x, int y){
Toast.makeText(_context, "text",Toast.LENGTH_LONG).show();
PieItem pieView = new PieItem(_context,x,y,2);
//FrameLayout.LayoutParams lyp = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT);
//pieView.setLayoutParams(lyp);
addView(pieView);
invalidate();
}
}
PieItem.java:
public class PieItem extends View{
private final float x;
private final float y;
private final int r;
private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
public PieItem(Context context, float x, float y, int r) {
super(context);
mPaint.setColor(0xFFFF0000);
this.x = x;
this.y = y;
this.r = r;
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawCircle(x, y, r, mPaint);
}
}
MainActivity.xml:
<FrameLayout 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" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="#string/hello_world" />
</FrameLayout>
Everytime I touch the scree, the toast is being called but the circle isn't being instantiated. Where am I going wrong?

easiest way to fix this, add view in onCreate:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pieMenu = new PieMenu(getApplicationContext());
FrameLayout fl = (FrameLayout)findViewById(R.id.layout);
fl.addView(pieMenu);
}
and add id to your main activity xml:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >

You aren't adding pieMenu to any of the views in your layout (R.layout.activity_main)
What does your activity_main.xml look like?

You didn't add created PieMenu to activity layout. You need to call something like this in onCreate method:
view.addView(pieMenu);
Or add your PieMenu to you activity_main layout.

Not able to add custom view into the layout programmatically

Hi I am creating a custom view in android.I have a LinerarLayout to which I am adding the custom views.I manage to add one custom view programmatically but if I add another it's not getting added into the layout.I don't know where am going wrong.My Main activity.
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
LinearLayout container = (LinearLayout) findViewById(R.id.container);
final MyAnimationView animView = new MyAnimationView(this);
container.addView(animView);
final MyAnimationView animView1 = new MyAnimationView(this);
container.addView(animView1);
}
and my custom view class
public class MyAnimationView extends TextView implements ValueAnimator.AnimatorUpdateListener {
public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>();
AnimatorSet animation = null;
private float mDensity;
public MyAnimationView(Context context) {
super(context);
mDensity = getContext().getResources().getDisplayMetrics().density;
ShapeHolder ball0 = addBall(75f, 400f);
}
public MyAnimationView(Context context,float x,float y) {
super(context);
mDensity = getContext().getResources().getDisplayMetrics().density;
ShapeHolder ball0 = addBall(105f, 400f);
}
private void createAnimation() {
if (animation == null) {
ObjectAnimator anim0=ObjectAnimator.ofFloat(balls.get(0),"y",getHeight(),500f).setDuration(500);
animation = new AnimatorSet();
animation.playTogether(anim0);
anim0.addUpdateListener(this);
}
}
private ShapeHolder addBall(float x, float y) {
OvalShape circle = new OvalShape();
circle.resize(100f * mDensity, 100f * mDensity);
ShapeDrawable drawable = new ShapeDrawable(circle);
ShapeHolder shapeHolder = new ShapeHolder(drawable);
shapeHolder.setX(x - 25f);
shapeHolder.setY(y - 25f);
int red = (int)(100 + Math.random() * 155);
int green = (int)(100 + Math.random() * 155);
int blue = (int)(100 + Math.random() * 155);
int color = 0xff000000 | red << 16 | green << 8 | blue;
Paint paint = drawable.getPaint(); //new Paint(Paint.ANTI_ALIAS_FLAG);
int darkColor = 0xff000000 | red/4 << 16 | green/4 << 8 | blue/4;
RadialGradient gradient = new RadialGradient(37.5f, 12.5f,
50f, color, darkColor, Shader.TileMode.CLAMP);
paint.setShader(gradient);
shapeHolder.setPaint(paint);
balls.add(shapeHolder);
return shapeHolder;
}
#Override
protected void onDraw(Canvas canvas) {
for (int i = 0; i < balls.size(); ++i) {
ShapeHolder shapeHolder = balls.get(i);
canvas.save();
canvas.translate(shapeHolder.getX(), shapeHolder.getY());
shapeHolder.getShape().draw(canvas);
canvas.restore();
}
}
public void startAnimation() {
createAnimation();
animation.start();
}
public void onAnimationUpdate(ValueAnimator animation) {
invalidate();
}
}
EDIT:here is my linear layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<Button
android:id="#+id/startButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
any help will be greatly appreciated.

Just an assumption, don´t know if it works. Try to do this in Your main:
LinearLayout container = (LinearLayout) findViewById(R.id.container);
final MyAnimationView animView = new MyAnimationView(this);
animView.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.
WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 1f));
container.addView(animView);
final MyAnimationView animView1 = new MyAnimationView(this);
animView1.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.
WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 1f));
container.addView(animView1);
does it work?

No it will be added but you can't see it. because your first view will take the full space of your screen. And your second will be added in below of your first view so it will be hidden from visible part of your device. I also met the same problem. I solved this with two layouts. see here for my solution.
I assume this is the problem that is why I provided this solution if not kindly let me know..