Question

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我有一个线程来运行硬币旋转动画，这是

    public class MainActivity extends Activity {
static AnimationDrawable frameAnimation;

public boolean currentSpin = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //is this where you want me to do it
    ImageView coinAnima = (ImageView) findViewById(R.id.imageView1);


    Button bt = (Button) findViewById(R.id.button1);
      bt.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
        spinCoin1();
        }
    });

}
//end of onCreate

public void spinCoin1(){
    coinAnima = (ImageView) findViewById(R.id.imageView1);
    coinAnima.setBackgroundResource(R.anim.coin_spin_heads); 

        new Thread(new Runnable() {
                    public void run() {
                        frameAnimation = (AnimationDrawable) coinAnima.getBackground();
                        frameAnimation.start();

                        try {
                            Thread.sleep(5000);
                          } catch (InterruptedException e) {
                            e.printStackTrace();
                          }    

                          frameAnimation.stop();

                    //end of run
                    }

        //starts the thread        
         }).start();

//end of method      
}
//end of class
}

它从按下按钮开始运行，当我第二次点击按钮时会导致错误

是

    03-10 23:33:28.804: E/AndroidRuntime(13689): FATAL EXCEPTION: Thread-12
03-10 23:33:28.804: E/AndroidRuntime(13689): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
03-10 23:33:28.804: E/AndroidRuntime(13689):    at android.view.ViewRoot.checkThread(ViewRoot.java:2936)
03-10 23:33:28.804: E/AndroidRuntime(13689):    at android.view.ViewRoot.invalidateChild(ViewRoot.java:642)
03-10 23:33:28.804: E/AndroidRuntime(13689):    at android.view.ViewRoot.invalidateChildInParent(ViewRoot.java:668)
03-10 23:33:28.804: E/AndroidRuntime(13689):    at android.view.ViewGroup.invalidateChild(ViewGroup.java:2511)
03-10 23:33:28.804: E/AndroidRuntime(13689):    at android.view.View.invalidate(View.java:5272)
03-10 23:33:28.804: E/AndroidRuntime(13689):    at android.view.View.invalidateDrawable(View.java:7310)
03-10 23:33:28.804: E/AndroidRuntime(13689):    at android.widget.ImageView.invalidateDrawable(ImageView.java:176)
03-10 23:33:28.804: E/AndroidRuntime(13689):    at android.graphics.drawable.Drawable.invalidateSelf(Drawable.java:300)
03-10 23:33:28.804: E/AndroidRuntime(13689):    at android.graphics.drawable.DrawableContainer.selectDrawable(DrawableContainer.java:227)
03-10 23:33:28.804: E/AndroidRuntime(13689):    at android.graphics.drawable.AnimationDrawable.setFrame(AnimationDrawable.java:211)
03-10 23:33:28.804: E/AndroidRuntime(13689):    at android.graphics.drawable.AnimationDrawable.nextFrame(AnimationDrawable.java:203)
03-10 23:33:28.804: E/AndroidRuntime(13689):    at android.graphics.drawable.AnimationDrawable.run(AnimationDrawable.java:140)
03-10 23:33:28.804: E/AndroidRuntime(13689):    at android.graphics.drawable.AnimationDrawable.start(AnimationDrawable.java:107)
03-10 23:33:28.804: E/AndroidRuntime(13689):    at com.example.testanima.MainActivity$2.run(MainActivity.java:61)
03-10 23:33:28.804: E/AndroidRuntime(13689):    at java.lang.Thread.run(Thread.java:1019)

任何人都可以告诉我这个错误的修复程序，再次感谢您的回复

Answer 1

你不能在另一个线程中使用gui元素。这在文档中明确说明。

您可以使用以下命令更新run（）中的gui元素：

 public void run()
 ...
  runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            update gui elements
                        }
                 });
 ....

在第一个动画完成后，也可以在动画上调用clear（）。然后你可以多次使用它。

Answer 2

您可以在UI线程上创建coinAnima，在创建视图的其余部分时创建它，然后设置为变量。或者您可以使用使用UI线程的Handler来运行您的runnable。有关如何在UI线程http://developer.android.com/training/multiple-threads/communicate-ui.html

上设置处理程序，请参阅此链接

Answer 3

试试这个，

public class MainActivity extends Activity {
static AnimationDrawable frameAnimation;

public boolean currentSpin = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //is this where you want me to do it
    ImageView coinAnima = (ImageView) findViewById(R.id.imageView1);
    coinAnima.setBackgroundResource(R.anim.coin_spin_heads);
    frameAnimation = (AnimationDrawable) coinAnima.getBackground();

Button bt = (Button) findViewById(R.id.button1);
  bt.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
    spinCoin1();
    }
});

}
//end of onCreate

public void spinCoin1(){  

    new Thread(new Runnable() {
                public void run() {

                    frameAnimation.start();

                    try {
                        Thread.sleep(5000);
                      } catch (InterruptedException e) {
                        e.printStackTrace();
                      }    

                      frameAnimation.stop();

                //end of run
                }

    //starts the thread        
     }).start();

  //end of method      
  }
//end of class
}

并检查this。

为什么在第二次点击按钮后不会再运行animationDrawable

3 个答案: