Android AnimationDrawable，为什么总是拍两次？

Question

我的代码:

---

package net.tq5.bubbleexplosion;

import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.AnimationDrawable;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnTouchListener;
import android.widget.FrameLayout;
import android.widget.ImageView;

public class BubbleExplosionActivity extends Activity {
 public static final String TAG = "BubbleExplosionActivity";
 /** Called when the activity is first created. */
 private FrameLayout parent;
 private ExplosionView customView;
 private AnimationDrawable exal;

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  // set no title;
  requestWindowFeature(Window.FEATURE_NO_TITLE);
  getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
    WindowManager.LayoutParams.FLAG_FULLSCREEN);
  // Create a FrameLayout and set the background;
  parent = new FrameLayout(this);
  parent.setBackgroundResource(R.drawable.bg);

  customView = new ExplosionView(this);
  customView.setVisibility(View.INVISIBLE);
  customView.setBackgroundResource(R.anim.explosion);

  exal = (AnimationDrawable) customView.getBackground();

  parent.addView(customView);
  parent.setOnTouchListener(new LayoutListener());
  setContentView(parent);
 }

 class ExplosionView extends ImageView {
  public ExplosionView(Context context) {
   super(context);
  }

  // handle the location of the Explosion;
  public void setLocation(int left, int top) {
   this.setFrame(left, top, left + 40, top + 40);
  }
 }

 class LayoutListener implements OnTouchListener {
  @Override
  public boolean onTouch(View view, MotionEvent event) {

   // first you stop the animation
   // you can always restart it;

   customView.setVisibility(View.INVISIBLE);
   if (exal.isRunning())
    return false;
//    exal.stop();
   float x = event.getX();
   float y = event.getY();
   Log.i(TAG, "on Touch");
   customView.setLocation((int) x - 20, (int) y - 20);
   customView.setVisibility(View.VISIBLE);
   exal.start();
   return false;
  }

 }
}

---

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="true">
     <item android:drawable="@drawable/bubble0" android:duration="500" />
    <item android:drawable="@drawable/explode1" android:duration="500" />
    <item android:drawable="@drawable/explode2" android:duration="500" />
    <item android:drawable="@drawable/explode3" android:duration="500" />
    <item android:drawable="@drawable/explode4" android:duration="500" />
    <item android:drawable="@drawable/explode5" android:duration="500" />
</animation-list>

---

图像bubble0总是显示两次；看起来动画已经被触发了两次，但我尝试这样做以确保 start() 方法只被触发一次，但动画仍会执行两次:

---

public class BubbleExplosionActivity extends Activity {
 public static final String TAG = "BubbleExplosionActivity";
 /** Called when the activity is first created. */
 private FrameLayout parent;
 private ExplosionView customView;
 private AnimationDrawable exal;

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  // set no title;
  requestWindowFeature(Window.FEATURE_NO_TITLE);
  getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
    WindowManager.LayoutParams.FLAG_FULLSCREEN);
  // Create a FrameLayout and set the background;
  parent = new FrameLayout(this);
  parent.setBackgroundResource(R.drawable.bg);

  customView = new ExplosionView(this);
  customView.setVisibility(View.INVISIBLE);
  customView.setBackgroundResource(R.anim.explosion);

  exal = (AnimationDrawable) customView.getBackground();

  parent.addView(customView);
  parent.setOnTouchListener(new LayoutListener());
  setContentView(parent);

  (new Handler()).postDelayed(new Runnable() {

   @Override
   public void run() {
    customView.setLocation((int) 100 - 20, (int) 100 - 20);
    customView.setVisibility(View.VISIBLE);
    exal.start();
   }

  }, 3000);
 }
}

---

帮助!

Answer 1

这对你来说可能有点晚了，但是当我遇到同样的问题时，我遇到了这个问题。

动画运行两次的原因是将 View 的可见性更改为 VISIBLE 将从头开始重新启动动画。

解决方案是启动()动画或将 View 可见性更改为 View.VISIBLE，但不能同时进行。