SLaks
SLaks
采纳率60.5%
2013-03-19 06:55

onKeyDown() 不能在继承类上运行

已采纳

我创建了一个自定义 GalleryView,在 Samsung Galaxy S III 或者 Nexus 4 上都可以执行。当我在模拟器中运行的时候,出现下面的错误:

02-24 01:01:03.593: E/AndroidRuntime(3429): FATAL EXCEPTION: Thread-11
02-24 01:01:03.593: E/AndroidRuntime(3429): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
02-24 01:01:03.593: E/AndroidRuntime(3429):     at android.view.ViewRoot.checkThread(ViewRoot.java:2802)
02-24 01:01:03.593: E/AndroidRuntime(3429):     at android.view.ViewRoot.playSoundEffect(ViewRoot.java:2581)
02-24 01:01:03.593: E/AndroidRuntime(3429):     at android.view.View.playSoundEffect(View.java:8516)
02-24 01:01:03.593: E/AndroidRuntime(3429):     at android.widget.Gallery.onKeyDown(Gallery.java:1109)
02-24 01:01:03.593: E/AndroidRuntime(3429):     at com.example.coverflow.ui.galleryView$1.run(galleryView.java:55)
02-24 01:01:03.593: E/AndroidRuntime(3429):     at java.lang.Thread.run(Thread.java:1096)

这些错误涉及到下面的代码:

public void startSlideShow(final int periodTime)
{
    final Runnable __runnable = new Runnable()
    {
        @Override
        public void run() 
        {
            if (!isTouched) 
                galleryView.this.onKeyDown(KeyEvent.KEYCODE_DPAD_RIGHT, null);
            mHandler.postDelayed(this, periodTime);              
        }
    };
    new Thread(__runnable).start();

    this.setOnTouchListener(new View.OnTouchListener()
    {
        @Override
        public boolean onTouch(View view, MotionEvent event) 
        {
            int currentEvent = event.getAction();
            if (currentEvent == MotionEvent.ACTION_DOWN 
                    || currentEvent == MotionEvent.ACTION_MOVE)
                isTouched = true;
            else
            {
                isTouched = false;
                // Reset handler
                mHandler.removeCallbacks(__runnable);
                mHandler.postDelayed(__runnable, periodTime);
            }
            return false;
        }
    });
}

如何处理这个问题?

Line 55 是galleryView.this.onKeyDown(KeyEvent.KEYCODE_DPAD_RIGHT, null);

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2条回答

  • xialonghua xialonghua 8年前
     galleryView.this.onKeyDown(KeyEvent.KEYCODE_DPAD_RIGHT, null);
    

    你这一句是在你自己new的thread里面执行的。所以会报错。

    mHandler.post(__runnable);
    new Thread(__runnable).start();
    

    这个不需要

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  • xiaoyan_12 xiaoyan_12 8年前

    你可以从其他线程中更新 UI,而不是activity UI 线程。
    就比如错误提示:

    Only the original thread that created a view hierarchy can touch its views.
    

    使用 runOnUIThread(new Runnable{ ... }()) 将文件访问代码打包

    import android.app.Activity;
    import android.content.Intent;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Toast;
    public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        MainActivity.this.runOnUiThread(new Runnable() {
             public void run() {
                Toast.makeText(MainActivity.this, "This is Toast!!!", Toast.LENGTH_SHORT).show();
        }
        });
    }
    }
    
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