Question

每当我运行应用程序时，它都会出现“应用程序意外停止”的错误请帮忙。我是android开发新手。

好的，这是错误日志

这是否会产生问题：mPreview = (SurfaceView)findViewById(R.id.preview); 那是我的代码：

Camera mCamera = null;
private static final String TAG = "Preview";
SurfaceView mPreview = null;
SurfaceHolder mHolder = null;

@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

    setContentView(R.layout.activity_main);

               mPreview = (SurfaceView)findViewById(R.id.preview);
    if (mHolder == null) { 
        mHolder = mPreview.getHolder(); 
    }

    mHolder.addCallback(this);
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);


    mCamera = Camera.open();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}

@Override
protected void onDestroy() {
    super.onDestroy();
    mCamera.release();
    mCamera.stopPreview();

}
@Override
protected void onPause() {
    super.onPause();
}



@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
        int height) {
    Camera.Parameters params = mCamera.getParameters();
    List<Camera.Size> sizes = params.getSupportedPreviewSizes();
    Camera.Size selected = sizes.get(0);
    params.setPreviewSize(selected.width, selected.height);

    mCamera.setParameters(params);
    mCamera.startPreview();     
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
    try {
        if (mCamera != null) {
            mCamera = Camera.open();

            mCamera.setPreviewDisplay(mPreview.getHolder());
        }
    } catch (IOException exception) {
        Log.e(TAG, "IOException caused by setPreviewDisplay()", exception);
    }
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
    if (mCamera != null) {
        mCamera.stopPreview();
    }
}

Xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <SurfaceView
        android:id="@+id/preview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true" />

</RelativeLayout>

Android Camera Preview App意外关闭错误

0 个答案: