無法獲取捕獲的圖像 uri

Question

我正在嘗試獲取捕獲的圖像 Uri，但沒有在下面的代碼中獲取我如何獲取 uri。 Toast 消息給我 null 結果

 Button b=findViewById(R.id.button);
    b.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            startActivityForResult(i,2);
        }
    });
}

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    Toast.makeText(Authentication.this,""+data.getData(),Toast.LENGTH_LONG).show();
}

Answer 1

嘗試這個：

if (requestCode == CAPTURE_IMAGE && 
                              resultCode == RESULT_OK) {
        if (data != null) {
        Bitmap bitmap = (Bitmap) data.getExtras().get("data");

        Uri imageUri = getImageUri(getApplicationContext(), bitmap);
        }
    }

調用此方法從 bitmap 獲取 uri：

public Uri getImageUri(Context inContext, Bitmap myImage) {
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    myImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
    String path = Images.Media.insertImage(inContext.getContentResolver(), 
    myImage, "Title", null);
    return Uri.parse(path);
}

Answer 2

從 Android 版本 LOLLIPOP 出於安全原因，您無法直接獲取 URI 試試這個 -

    private static Uri getSharableImageUri(Context context) {
File outputDir = context.getCacheDir();
File imagePath = new File(outputDir, context.getString(R.string.app_name));
if (!imagePath.exists()) {
    imagePath.mkdir();
}
File tempFile = new File(imagePath, "image.jpg");
Uri uri = null;
try {
    if (!tempFile.exists()) {
        tempFile.createNewFile();
    }
    uri = FileProvider.getUriForFile(context, context.getPackageName() + ".fileprovider", tempFile);
} catch (Exception e) {
    e.printStackTrace();
}
return uri;
}

在你的按鈕的點擊監聽器中使用這個 -

     Button b=findViewById(R.id.button);
b.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
       Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
try {
    String state = Environment.getExternalStorageState();
    if (Environment.MEDIA_MOUNTED.equals(state)) {

        mImageCaptureUri = getSharableImageUri(context);
    }
    if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.LOLLIPOP) {
        intent.setClipData(ClipData.newRawUri("", mImageCaptureUri));

    }
    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
    intent.putExtra(MediaStore.EXTRA_OUTPUT, mImageCaptureUri);
    intent.putExtra("return-data", true);
    startActivityForResult(intent, 2);

} catch (Exception e) {
   e.printStackTrace();
}
    }
});

}

如果結果成功，則在 onActivityResult 中獲取 URI -

    public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
            if (resultCode == Activity.RESULT_OK && requestCode==2) {
    Toast.makeText(Authentication.this,""+data.getData(),Toast.LENGTH_LONG).show();
    }