Develop Reference

How to increase and decrease TextView font size in Android

I have 2 buttons for increasing and decreasing TextView font size:
btnZoomin.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
txtview.setTextSize(txtview.getTextSize()+1);
}
});
btnZoomout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
txtview.setTextSize(txtview.getTextSize()-1);
}
});
But are experiencing difficulty, as it will not work.

If anyone is still facing the text size issue. You can use this code:
To increase size: tvText.setTextSize(0, tvText.getTextSize() + 2.0f);
To decrease size tvText.setTextSize(0, tvText.getTextSize() - 2.0f);

txtview.setTextSize(TypedValue.COMPLEX_UNIT_PX,txtview.getTextSize()-1);
txtview.setTextSize(TypedValue.COMPLEX_UNIT_PX,txtview.getTextSize()+1);

How can you see in the DOCS setTextSize needs 2 arguments: the TypedValue and the new size.
Your code is fine, you just have to add the TypedValue :
txtview.setTextSize(TypedValue.COMPLEX_UNIT_SP,txtview.getTextSize()-1);
txtview.setTextSize(TypedValue.COMPLEX_UNIT_SP,txtview.getTextSize()+1);

Use this text.setTextSize(TypedValue.COMPLEX_UNIT_SP,14);

Sorry for the previous code, that was wrong but i think this will work for you,
package com.example.sample;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
int counter = 0;
private int size;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final TextView txt = (TextView) findViewById(R.id.txt);
Button btn = (Button) findViewById(R.id.button1);
counter = (int) txt.getTextSize();
btn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), txt.getTextSize() + "",
Toast.LENGTH_LONG).show();
size = counter++;
txt.setTextSize(size);
}
});
}
}

How to call onclicklistner of animated image android

i am working on android app
in which i have an animated image.
my code is
Display display = getWindowManager().getDefaultDisplay();
int width = display.getWidth()/2;
left = new TranslateAnimation(0, hight, width, hight);
left1= new TranslateAnimation( 480, 10, 0, 10);
left.setDuration(2000);
left.setAnimationListener(this);
b1 =(ImageView)findViewById( R.id.balloon);
b1.setOnClickListener(this);
b1.startAnimation(left);
#Override
public void onClick(View v) {
Toast.makeText(this, "Clicked", 27).show();
}
using this code i am able to animate ballon or my picture but i the onclick lisnter only works when animation is completed i want onclicklistner should work during animation how to do this.
sorry for bad english

Override onAnimationStart and onAnimationEnd functions in your AnimationListener. Keep a variable to check whether animation is playing when the image clicked.
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends Activity {
private ImageView imageView;
private boolean animationPlaying;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TranslateAnimation animation = new TranslateAnimation( 480, 10, 0, 10);
animation.setDuration(2000);
animation.setAnimationListener(new AnimationListener() {
#Override
public void onAnimationStart(Animation animation) {
animationPlaying = true;
}
#Override
public void onAnimationRepeat(Animation animation) {
}
#Override
public void onAnimationEnd(Animation animation) {
animationPlaying = false;
}
});
imageView = (ImageView) findViewById(R.id.imageView1);
imageView.startAnimation(animation);
imageView.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
if(animationPlaying) {
Toast.makeText(getBaseContext(), "Click", Toast.LENGTH_SHORT).show();
} else {
Log.d("ANIMATION", "click missed because animation was not playing");
}
}
});
}
}

XML Animation executing synced

I've made some simple animations which I called breath because the object slowly get bigger and smaller in a loop.
Then I associated this animation to 3 imagebuttons and everything works ok, but when I interact with a button, which do another "vibrate" animation, all of them restart the animation together, while the expected behaviour was that only the pressed button would have restarted the animation.
I would like to understand that a bit better, and maybe how to achieve that every button's animation have its own lifecycle.
That's the code:
breath.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="#android:anim/accelerate_decelerate_interpolator" >
<scale
android:duration="1500"
android:startOffset="0"
android:fromXScale="0.9"
android:fromYScale="0.9"
android:pivotX="50%"
android:pivotY="50%"
android:toXScale="1.0"
android:toYScale="1.0"
android:repeatMode="reverse"
android:repeatCount="infinite" />
</set>
and that's the java code:
package com.anesoft.android.citmania;
import com.anesoft.android.citmania.models.Defines;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Typeface;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class MenuActivity extends Activity implements OnClickListener, AnimationListener {
ImageButton opzioni;
ImageButton play;
ImageButton espansioni;
ImageView logo;
TextView title,title2;
Animation breath,rotate_r,rotate_l,vibrate;
int flag = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu);
logo = (ImageView)findViewById(R.id.logo);
title = (TextView)findViewById(R.id.title);
title2 = (TextView)findViewById(R.id.title2);
opzioni = (ImageButton)findViewById(R.id.options);
play = (ImageButton)findViewById(R.id.play);
espansioni = (ImageButton)findViewById(R.id.expansions);
breath = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.breath);
rotate_r = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.rotate_right);
rotate_l = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.rotate_left);
vibrate = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.vibrate);
vibrate.setAnimationListener(this);
Typeface tf = Typeface.createFromAsset(getAssets(), "font/Canter_Light.otf");
Typeface tf2 = Typeface.createFromAsset(getAssets(), "font/Canter Bold.otf");
title.setTypeface(tf);
title2.setTypeface(tf2);
title.setText("CIT");
title.setTextSize(Defines.TITLE_SIZE);
title2.setText(".MANIA");
title2.setTextSize(Defines.TITLE_SIZE);
opzioni.startAnimation(breath);
play.startAnimation(breath);
espansioni.startAnimation(breath);
logo.setOnClickListener(this);
opzioni.setOnClickListener(this);
play.setOnClickListener(this);
espansioni.setOnClickListener(this);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu, menu);
return true;
}
#Override
public void onClick(View v) {
int id = v.getId();
if (id == R.id.options) {
Intent i = new Intent(this, OptionsActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
startActivity(i);
} else if (id == R.id.play) {
Intent i = new Intent(this, LevelPickerActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
startActivity(i);
} else if(id == R.id.expansions){
espansioni.startAnimation(vibrate);
Toast.makeText(this, "Implementando", Toast.LENGTH_SHORT).show();
//espansioni.startAnimation(bounce);
}else if(id == R.id.logo){
if(flag==0){
logo.startAnimation(rotate_r);
flag=1;
}else{
logo.startAnimation(rotate_l);
flag=0;
}
}
}
#Override
public void onAnimationEnd(Animation arg0) {
if (arg0 == vibrate) {
espansioni.startAnimation(breath);
}
}
#Override
public void onAnimationRepeat(Animation animation) {
// TODO Auto-generated method stub
}
#Override
public void onAnimationStart(Animation animation) {
// TODO Auto-generated method stub
}
}
You can see how I start the vibrate animation and then when IT finishes I restart the breath one only in the button being tapped, but all of them restart the animation in a synced way.
Thanks in advance

If you want the animation to work independently on all 3 buttons, you'll need to create 3 instances of the animation.
Once the animation is halted, it gives its views a new state. If you gave 3 views the same animation, they will all receive the new state.

I can not pass the parameter i to the button[i]

I am trying to play a sound on button click and I am trying to make it call the .start() function only but the problem is I set the i parameter in the onclick function and so it does not pass the i to the onclicklistner function any ideas how to fix that ??
here is my code
package com.example.buttonsdemo;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.app.Activity;
import android.support.v4.widget.SimpleCursorAdapter.ViewBinder;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity implements View.OnClickListener{
//Creating Sound arrays
int i=0;
MediaPlayer[] mediaplayer = new MediaPlayer[120];
Button button[] = new Button [120];
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Initialize the mediaplayer
for(int z=0;z<120;z++)
{
mediaplayer[z]=null;
}
//Initialize Button Array
for(int x=0;x<120;x++)
{
button[x]=new Button(this);
button[x].setOnClickListener(this);
}
//Creating Media player array
mediaplayer[0]= MediaPlayer.create(this,R.raw.akali);
mediaplayer[1]= MediaPlayer.create(this,R.raw.alistar);
button[i].setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
switch(v.getId())
{
case R.id.akali:
i=0;
break;
case R.id.alistar:
i=1;
break;
}
mediaplayer[i].start();
}
} );
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
}

Inside your Listener, you want to use a variable which is declared inside your Listener.
You are trying to use a variable (i) which is declared in code which is not run when the Listener is run.
new View.OnClickListener() {
#Override
public void onClick(View v) {
int idx;
switch(v.getId()) {
case R.id.akali:
idx=0;
break;
case R.id.alistar:
idx=1;
break;
}
mediaplayer[idx].start();
}
}
Or invoke the respective start() method right in the case.

Dump the 'i' declared. Replace method with this (the "Button theButton" needs to stay 'final').
for(int z=0;z<120;z++)
{
final Button theButton = button[z];
theButton.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
// TODO Auto-generated method stub
// do what you want.
}
});
}

I believe your onCreate should be created like this:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Initialize the mediaplayer
for(int z=0;z<120;z++)
{
mediaplayer[z]=null;
}
mediaplayer[0]= MediaPlayer.create(this,R.raw.akali);
mediaplayer[1]= MediaPlayer.create(this,R.raw.alistar);
//Initialize Button Array
for( x=0;x<120;x++)
{
button[x]=new Button(this);
button[x].setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mediaplayer[x].start();
}
} );
}
}

So basically you just need to make several button on the fly which produces different sound when clicked. Try this code:
Button myButton[] = new Button[100];
MediaPlayer mySound = new MediaPlayer();
for (int i=0; i<100; i++) {
myButton[i] = new Button(this);
myButton[i].setId(i+1);
myButton[i].setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Resources res = context.getResources();
int soundId = res.getIdentifier("sound" + v.getId(), "raw", context.getPackageName());
mySound.create(getApplicationContext(), soundId);
mySound.start();
}
});
}

I want to change from an xml layout to surfaceview using java

OK so I'm using xml to set this menu which is supported by the following java code
package starting.rt;
import java.util.List;
import java.util.Random;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class Menu extends Activity implements OnClickListener{
View.OnTouchListener gestureListener;
TextView display;
Button begin;
Button random;
Button game;
TextView counter;
Button next;
Button previous;
Button moreapps;
Button rate;
Random myRandom;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(starting.rt.R.layout.menu);
begin = (Button) findViewById(starting.rt.R.id.Begin);
random = (Button) findViewById(starting.rt.R.id.Random);
display = (TextView) findViewById(starting.rt.R.id.tvResults);
counter = (TextView) findViewById(starting.rt.R.id.tvCounter);
next = (Button) findViewById(starting.rt.R.id.Next);
previous = (Button) findViewById(starting.rt.R.id.Previous);
moreapps = (Button)findViewById(R.id.More);
rate = (Button) findViewById(R.id.rate);
game = (Button) findViewById(R.id.game);
// display.setOnTouchListener(this.gestureListener);
begin.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent openStartingPoint = new Intent("starting.rt.RelationshipTipsActivity");
startActivity(openStartingPoint);
}});
moreapps.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent goToMarket;
goToMarket = new Intent(Intent.ACTION_VIEW, Uri.parse("market://search?q=pub:\"Wompa\""));
startActivity(goToMarket);
}});
game.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent openStartingPoint = new Intent("starting.rt.GameView");
startActivity(openStartingPoint);
}});
rate.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse("market://details?id=" + getPackageName()));
startActivity(i);
}});}
public void onClick(View v) {
// TODO Auto-generated method stub
}
}
Now what's supposed to be happening is when they click on the game which starts a new java class called GameView it crashes on clicked. Every other button works.
This is the code from GameView
package starting.rt;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class GameView extends SurfaceView {
private GameLoopThread gameLoopThread;
private List<Sprite> sprites = new ArrayList<Sprite>();
private List<TempSprite> temps = new ArrayList<TempSprite>();
private long lastClick;
private Bitmap bmpBlood;
public GameView(Context context) {
super(context);
gameLoopThread = new GameLoopThread(this);
getHolder().addCallback(new SurfaceHolder.Callback() {
public void surfaceDestroyed(SurfaceHolder holder) {
boolean retry = true;
gameLoopThread.setRunning(false);
while (retry) {
try {
gameLoopThread.join();
retry = false;
} catch (InterruptedException e) {}
}
}
public void surfaceCreated(SurfaceHolder holder) {
createSprites();
gameLoopThread.setRunning(true);
gameLoopThread.start();
}
public void surfaceChanged(SurfaceHolder holder, int format,
int width, int height) {
}
});
bmpBlood = BitmapFactory.decodeResource(getResources(), R.drawable.blood1);
}
private void createSprites() {
sprites.add(createSprite(R.drawable.bad1));
// sprites.add(createSprite(R.drawable.bad2));
// sprites.add(createSprite(R.drawable.bad3));
// sprites.add(createSprite(R.drawable.bad4));
// sprites.add(createSprite(R.drawable.bad5));
// sprites.add(createSprite(R.drawable.bad6));
// sprites.add(createSprite(R.drawable.good1));
// sprites.add(createSprite(R.drawable.good2));
// sprites.add(createSprite(R.drawable.good3));
// sprites.add(createSprite(R.drawable.good4));
// sprites.add(createSprite(R.drawable.good5));
// sprites.add(createSprite(R.drawable.good6));
}
private Sprite createSprite(int resouce) {
Bitmap bmp = BitmapFactory.decodeResource(getResources(), resouce);
return new Sprite(this, bmp);
}
#Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.BLACK);
for (int i = temps.size() - 1; i >= 0; i--) {
temps.get(i).onDraw(canvas);
}
for (Sprite sprite : sprites) {
sprite.onDraw(canvas);
}
}
#Override
public boolean onTouchEvent(MotionEvent event) {
if (System.currentTimeMillis() - lastClick > 300) {
lastClick = System.currentTimeMillis();
float x = event.getX();
float y = event.getY();
synchronized (getHolder()) {
for (int i = sprites.size() - 1; i >= 0; i--) {
Sprite sprite = sprites.get(i);
if (sprite.isCollition(x, y)) {
sprites.remove(sprite);
temps.add(new TempSprite(temps, this, x, y, bmpBlood));
break;
}
}
}
}
return true;
}
}
The GameView calls a few other classes for things part of the game but it crashes before it can start. I think it's crashing because it's switching from xml layout to the java surfaceview. Help would be appreciated :) Thanks!

First of all, you should always post in your questions the stacktrace with the exception from the Logcat if your app crashes.
You can't start a SurfaceView directly, instead your custom SurfaceView must be embedded in an Activity like any other view in android. For example:
public class GameViewActivity extends Activity {
#Override
public void onCreate(Bundle savedInstance) {
super.onCreate(savedInstance);
setContentView(new GameView(this));
}
}