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POcreating a strobe, flashing background using handlers
 

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  1. POcreating a strobe, flashing background using handlers
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    <p>I am trying to make a strobe effect in the background of my app. I read that handlers would work the best, but I'm just not sure how to apply them. I saw <a href="https://stackoverflow.com/questions/12810705/how-do-i-make-a-layout-background-flashing-in-android">this post</a></p> <pre><code> public boolean onTouch(View v, MotionEvent event) { final int DELAY = 100; if(event.getAction() == MotionEvent.ACTION_UP) { RelativeLayout fondo = (RelativeLayout) findViewById(R.id.fondo); ColorDrawable f = new ColorDrawable(0xff00ff00); ColorDrawable f2 = new ColorDrawable(0xffff0000); ColorDrawable f3 = new ColorDrawable(0xff0000ff); ColorDrawable f4 = new ColorDrawable(0xff0000ff); AnimationDrawable a = new AnimationDrawable(); a.addFrame(f, DELAY); a.addFrame(f2, DELAY); a.addFrame(f3, DELAY); a.addFrame(f4, DELAY); a.setOneShot(false); fondo.setBackgroundDrawable(a); // This method is deprecated in API 16 // fondo.setBackground(a); // Use this method if you're using API 16 a.start(); } return true; } </code></pre> <p>What do I need to do to fix this? and is there a way to do this without handlers?</p> <pre><code> package com.example.converter; import android.app.Activity; import android.graphics.drawable.AnimationDrawable; import android.graphics.drawable.ColorDrawable; import android.view.MotionEvent; import android.view.View; import android.widget.RelativeLayout; public class Savannah extends Activity { RelativeLayout r = (RelativeLayout) findViewById(R.layout.activity_savannah); r.setOnTouchListener=(new OnTouchListener() { @Override public boolean onTouch(View view, MotionEvent event) { final int DELAY = 100; if (event.getAction() == MotionEvent.ACTION_UP) { RelativeLayout fondo = (RelativeLayout) findViewById(R.layout.activity_savannah); ColorDrawable f = new ColorDrawable(0xff00ff00); ColorDrawable f2 = new ColorDrawable(0xffff0000); ColorDrawable f3 = new ColorDrawable(0xff0000ff); ColorDrawable f4 = new ColorDrawable(0xff0000ff); AnimationDrawable a = new AnimationDrawable(); a.addFrame(f, DELAY); a.addFrame(f2, DELAY); a.addFrame(f3, DELAY); a.addFrame(f4, DELAY); a.setOneShot(false); fondo.setBackgroundDrawable(a); // This method is deprecated // in API // 16 // fondo.setBackground(a); // Use this method if you're // using API 16 a.start(); } return true; } }); } </code></pre> <p>this is what i have, but the seontouch listener is flagging errors as is the ontouch view view motion event.</p>
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    1. COI tried your code but to activate the animation i use the `onTouch()` event of the relative layout, and it worked perfectly. So what is your problem?
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      1. USAli Imran
    2. COWhat Happens when you run the code? Does it throw an exception or does it just not work?
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    3. COthe onTouch command and fondo flag as errors
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