Android 相机将位图从 Camera Intent 传递到 MainActivity

Question

我正在尝试拍照并在我的 MainActivity 中将其设置为 ImageView。我想将我的相机 activity 作为单独的 class 使用，所以我尝试了以下操作：主要Activity:

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Activity:

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 Intent 正常启动，但是当我拍照时，我没有返回到 ActivityResult 在我的 MainActivity 中，我卡在相机 Intent 中。

Answer 1

您的 onStart() 在 onActivityResult() 执行后被调用。因此一次又一次地启动相机意图。放置日志并测试你自己。解决问题在 activity isFronActivityResult 中保留一个布尔变量。保持默认值为 false 并执行 isFromActivityResult = true;在 onActivityResult() 里面。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 {...}
    }
}

Android 相机将位图从 Camera Intent 传递到 MainActivity

Android Camera passing bitmap from Camera Intent to MainActivity

camera

android

bitmap

callback

android-intent