Question

我有一个应用程序，允许用户通过该应用程序拍照，然后我希望将文件保存到外部存储中，然后加载该文件并将其放到imageview中。到目前为止，我拥有的代码会保存到外部存储中，但是当我尝试加载它时，它会指出该文件不存在。

public class MainActivity extends AppCompatActivity {

ImageView mImageView;
String fileName = "image.jpg";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Button cameraButton = findViewById(R.id.cameraButton);
    Button photoButton = findViewById(R.id.photoButton);
    mImageView = findViewById(R.id.photoViewer);

    if(!isExternalStorageWritable()) {
        out.println("NOT WRITABLE");
    }
    if(!isExternalStorageReadable()) {
        out.println("NOT READABLE");
    }

    cameraButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            startActivityForResult(cameraIntent, 0);
        }
    });

    photoButton.setOnClickListener(new View.OnClickListener() {
       @Override
        public void onClick(View view) {
           loadPhoto(fileName);
       }
    });
}

此方法保存拍摄的照片：

public File savePhoto() {
    File filePath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
    //Create a new folder in the sd card / emulated external storage
    File dir = new File(filePath.getAbsolutePath() + "/QuoteApp");

    ///storage/emulated/0/Pictures/QuoteApp/image.jpg

    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    File mediaFile = new File(dir + "image" + ".jpg");

    return mediaFile;
}

此方法将加载在上一个方法中保存的照片：

public void loadPhoto(String fileName) {
    File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/Pictures/QuoteApp/" + fileName);

    //File path is /storage/emulated/0/Pictures/QuoteApp/image.jpg
    String filePath = file.getAbsolutePath();

    Bitmap bitmapReturn = BitmapFactory.decodeFile(filePath);

    mImageView.setImageBitmap(bitmapReturn);
}

此方法创建图像并调用savePhoto方法：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    super.onActivityResult(requestCode, resultCode, data);
    Bitmap bitmap = (Bitmap) data.getExtras().get("data");

    savePhoto();
  }
}

我在做什么错了？

如何将通过相机拍摄的图像保存到Android应用程序的外部存储中？

0 个答案: