java - 无法获取捕获的图像 uri

Question

我正在尝试获取捕获的图像 Uri，但没有在下面的代码中获取如何获取 uri。 Toast 消息给我空结果

 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

从 Android 版本 LOLLIPOP 中，出于安全原因，您无法直接获取 URI，请尝试此操作 -

    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;
}

并在按钮的点击监听器中使用此-

     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();
}
    }
});

}

如果结果成功，则在onActivityResult中获取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();
    }