Android Camera 将位图从 Camera Intent 传递到 MainActivity

Question

我正在尝试拍照并将其在我的 MainActivity 中设置为 ImageView。 我想将我的相机活动作为一个单独的课程，所以我尝试了以下方法： 主要活动：

public void onClick(View v) {
    switch (v.getId()) {
        case R.id.action_button:
            Intent camera = new Intent(MainActivity.this,Camera.class);
            startActivityForResult(camera ,CAMERA_IDENTIFITER);
            break;
        default:
            break;
    }
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    //super.onActivityResult(requestCode, resultCode, data);
    Log.d("onActivityResult","Sucessfully callbacked!"); //This one wont be executed!
    switch(requestCode) {
        case (CAMERA_IDENTIFITER) : {
            if (resultCode == Activity.RESULT_OK) {
                Bitmap bitmap = (Bitmap) data.getParcelableExtra(MediaStore.EXTRA_OUTPUT);
                mImageView.setImageBitmap(bitmap);
            }
            break;
        }
    }
}

这是我的相机活动：

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_camera);
    takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    pm = getPackageManager();
}
@Override
protected void onStart() {
    super.onStart();
    if(!isFromActivityResult){
        dispatchTakePictureIntent();
    }
}
public void dispatchTakePictureIntent() {
    if (takePictureIntent.resolveActivity(pm) != null) {
        File photoFile = null;
        try {
            photoFile = createImageFile();
        } catch {...}
        if (photoFile != null) {
            pictureTaken = true;
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
                    Uri.fromFile(photoFile));
            startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
        }
    } 
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_TAKE_PHOTO && resultCode == RESULT_OK) {
        try {
            bitmap = ImageFileHandler.handleSamplingAndRotationBitmap(this, Uri.fromFile(new File(mCurrentPhotoPath)));
            //mImageView.setImageBitmap(bitmap);
            resultIntent = new Intent();
            resultIntent.putExtra(MediaStore.EXTRA_OUTPUT,
                    bitmap);
            setResult(Activity.RESULT_OK, resultIntent);
            Log.d("onActivityResult","finish() executed!"); //This one gets executed!
            finish();
        } catch {...}
    }
}

相机意图正常启动，但是当我拍照时，我没有回到 MainActivity 中的 onActivityResult ，我卡在相机意图中。

Answer 1

你的 onStart() 在 onActivityResult() 被执行后被调用。因此，一次又一次地启动相机意图。放置日志并测试自己。 解决问题 在您的活动中保留一个布尔变量 isFronActivityResult。保持默认值为 false 并执行 isFromActivityResult = true;在 onActivityResult() 中。在 onStart 中执行以下操作：

          @Override
        protected void onStart() {
            super.onStart();
            if(!isFromActivityResult)
              dispatchTakePictureIntent();
        }

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_TAKE_PHOTO && resultCode == RESULT_OK) {
        try {
            bitmap = ImageFileHandler.handleSamplingAndRotationBitmap(this, Uri.fromFile(new File(mCurrentPhotoPath)));
            //mImageView.setImageBitmap(bitmap);
            resultIntent = new Intent();
            resultIntent.putExtra(MediaStore.EXTRA_OUTPUT,
                    bitmap);
            setResult(Activity.RESULT_OK, resultIntent);
            isFromActivityResult = true;// add this line
            finish();
        } catch {...}
    }
}