android摄像头编程 onPictureTaken方法无法回调？？？？

最新推荐文章于 2025-06-02 15:29:00 发布

CenDor

最新推荐文章于 2025-06-02 15:29:00 发布

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分类专栏：移动开发文章标签： android Android camera Camera onPictureTaken

本文链接：https://blog.youkuaiyun.com/Axiem/article/details/8229125

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本文主要探讨了在Android应用中使用Camera API进行拍照时，遇到onPictureTaken方法无法正常回调的问题。通过分析代码，指出可能的原因及解决方案，包括检查SurfaceHolder设置、权限、相机初始化和配置等方面。

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public class MainActivity extends Activity implements SurfaceHolder.Callback {
protected static final int TAKE_PHOTO_WITH_DATA = 0;
private Button takeButton = null;
private Button identifyButton = null;
private SurfaceView cSurfaceView;
private SurfaceHolder sfh;
Camera camera;

@Override
protected void onDestroy() {
  camera.startPreview();
  camera.release();
  super.onDestroy();
}

@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  cSurfaceView = (SurfaceView) findViewById(R.id.surface_camera);
  sfh = cSurfaceView.getHolder();
  sfh.addCallback(this);
  sfh.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
  takeButton = (Button) findViewById(R.id.take_picture);
  takeButton.setOnClickListener(new ButtonListner());
  identifyButton = (Button) findViewById(R.id.identify_picture);
  identifyButton.setOnClickListener(new ButtonListner());
}

public void onPictureTaken(byte[] data, Camera camera) {
System.out.println(camera);
}

class ButtonListner implements OnClickListener, Camera.PictureCallback {

  public void onClick(View v) {
   switch (v.getId()) {
   case R.id.take_picture:
    camera.takePicture(null, this, this, this);
    break;
   case R.id.identify_picture:
    break;
   }

}

  public void onPictureTaken(byte[] data, Camera camera) {
   System.out.println("takenpicture");
  }

}

public void surfaceCreated(SurfaceHolder holder) {
  camera = Camera.open();
  try {
   Camera.Parameters parameters = camera.getParameters();
   if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {
    // 这是一个众所周知但未文档化的特性
    parameters.set("orientation", "portrait");

// 对于Android 2.2及以上版本
camera.setDisplayOrientation(90);

parameters.setRotation(90);
} else {

parameters.set("orientation", "landscape");

camera.setDisplayOrientation(0);

    parameters.setRotation(0);
   }
   camera.setParameters(parameters);
   camera.setPreviewDisplay(holder);
  } catch (IOException exception) {
   camera.release();

}
camera.startPreview();
}

public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
camera.startPreview();
}

public void surfaceDestroyed(SurfaceHolder holder) {

}
}