保存没有INTENT的Android CAMERA API

Question

你好，我有整个代码，但我想自动保存快照并释放相机回预览。我不知道怎么做:/它正在拍摄快照，但不要保存两个释放相机。

谢谢你们的帮助!!

package com.velcisribeiro.xcamera;
+imports
public class MainActivity extends Activity {
private Camera cameraObject;
private ShowCamera showCamera;
private ImageView pic;
public static Camera isCameraAvailiable(){
    Camera object = null;
    try {
        object = Camera.open();
    }
    catch (Exception e){
    }
    return object;
}
private PictureCallback capturedIt = new PictureCallback() {
    @Override
    public void onPictureTaken(byte[] data, Camera camera) {
        Bitmap bitmap = BitmapFactory.decodeByteArray(data , 0, data .length);
        if(bitmap==null){
            Toast.makeText(getApplicationContext(), "not taken", Toast.LENGTH_SHORT).show();
        }
        else
        {
            Toast.makeText(getApplicationContext(), "taken", Toast.LENGTH_SHORT).show();
        }
        cameraObject.release();
    }
};
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_camera);
    cameraObject = isCameraAvailiable();
    showCamera = new ShowCamera(this, cameraObject);
    FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
    preview.addView(showCamera);
}
public void snapIt(View view){
    cameraObject.takePicture(null, null, capturedIt);
}
}

另一个是:

public class ShowCamera extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder holdMe;
private Camera theCamera;
public ShowCamera(Context context,Camera camera) {
    super(context);
    theCamera = camera;
    holdMe = getHolder();
    holdMe.addCallback(this);
}
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
    try   {
        theCamera.setPreviewDisplay(holder);
        theCamera.setDisplayOrientation(90);
        theCamera.startPreview();
    } catch (IOException e) {
    }
}
@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
}
}

Answer 1

当我在构建自己的相机实现时，我只是使用了Zxing库提供的代码。它工作得很好，你可以很容易地修改它来做你想做的事情:https://github.com/zxing/zxing

Answer 2

你需要在surfaceDestroyed回调中添加以下两行来释放相机。

theCamera.stopPreview ();
theCamera.release ();对于保存图像更改onPictureTaken回调。
public void onPictureTaken(byte[] data, Camera Camera) {

    Bitmap bitmap = BitmapFactory.decodeByteArray(data , 0, data .length);
    if(bitmap==null){
        Toast.makeText(getApplicationContext(), "not taken", Toast.LENGTH_SHORT).show();
    }
    else
    {
        Toast.makeText(getApplicationContext(), "taken", Toast.LENGTH_SHORT).show();
    }
    //Add code to save image
    cameraObject.release();
}

还可以查看下面的URL以更好地理解。http://androidtrainningcenter.blogspot.in/2012/01/how-to-use-android-camera-to-take.html。