当我在Android 7上运行我的应用程序时，我的应用程序崩溃了。 Android监视器抛出这个：
Caused by: android.os.FileUriExposedException: file:///storage/emulated/0/picture.jpg exposed beyond app through ClipData.Item.getUri()
代码是
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case REQUEST_WRITE_PERMISSION:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
takePicture();
} else {
Toast.makeText(MainActivity.this, "Permission Denied!", Toast.LENGTH_SHORT).show();
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == PHOTO_REQUEST && resultCode == RESULT_OK) {
Toast.makeText(this,"CLICK ON THE TEXT TO SAVE THE DATA",Toast.LENGTH_LONG).show();
launchMediaScanIntent();
try {
Bitmap bitmap = decodeBitmapUri(this, imageUri);
if (detector.isOperational() && bitmap != null) {
Frame frame = new Frame.Builder().setBitmap(bitmap).build();
SparseArray<TextBlock> textBlocks = detector.detect(frame);
String blocks = "";
String lines = "";
String words = "";
for (int index = 0; index < textBlocks.size(); index++) {
//extract scanned text blocks here
TextBlock tBlock = textBlocks.valueAt(index);
blocks = blocks + tBlock.getValue() + "\n" + "\n";
for (Text line : tBlock.getComponents()) {
//extract scanned text lines here
lines = lines + line.getValue() + "\n";
for (Text element : line.getComponents()) {
//extract scanned text words here
words = words + element.getValue() + ", ";
}
}
}
if (textBlocks.size() == 0) {
scanResults.setText("Scan Failed: Found nothing to scan");
} else {
scanResults.setText(scanResults.getText() + "\n");
scanResults.setText(scanResults.getText() + blocks + "\n");
}
} else {
scanResults.setText("Could not set up the detector!");
}
} catch (Exception e) {
Toast.makeText(this, "Failed to load Image", Toast.LENGTH_SHORT)
.show();
Log.e(LOG_TAG, e.toString());
}
}
}
private void takePicture() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File photo = new File(Environment.getExternalStorageDirectory(), "picture.jpg");
imageUri = Uri.fromFile(photo);
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intent, PHOTO_REQUEST);
scanResults.setText("");
}
@Override
protected void onSaveInstanceState(Bundle outState) {
if (imageUri != null) {
outState.putString(SAVED_INSTANCE_URI, imageUri.toString());
outState.putString(SAVED_INSTANCE_RESULT, scanResults.getText().toString());
}
super.onSaveInstanceState(outState);
}
private void launchMediaScanIntent() {
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
mediaScanIntent.setData(imageUri);
this.sendBroadcast(mediaScanIntent);
}
private Bitmap decodeBitmapUri(Context ctx, Uri uri) throws FileNotFoundException {
int targetW = 600;
int targetH = 600;
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeStream(ctx.getContentResolver().openInputStream(uri), null, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
int scaleFactor = Math.min(photoW / targetW, photoH / targetH);
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor;
return BitmapFactory.decodeStream(ctx.getContentResolver()
.openInputStream(uri), null, bmOptions);
}
public void store_in_database(View view) {
Intent i = new Intent(MainActivity.this , DbActivity.class);
i.putExtra("message",scanResults.getText().toString());
MainActivity.this.startActivity(i);
}
代码形式的任何帮助都会很棒。我理解这可能是由于与android 7相关的文件系统权限。任何代码形式的解释都是最受欢迎的。我正在尝试访问相机并将图像存储到android数据库中。
答案 0 :(得分：0)
在牛轧糖中你要做的就是使用FileProvider这样的路径：
在应用程序的清单中声明提供者：
<application
...> <provider android:name="android.support.v4.content.FileProvider" android:authorities="com.safetynetwork.provider" android:exported="false" android:grantUriPermissions="true"> <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/provider_paths" /> </provider> </application>
在资源下创建xml包，并在那里添加 provider_path.xml 。
<paths> <external-path name="SN" path="Android/data/com.packagename/files/Pictures/SN/"/> </paths>
现在为您在provider_path.xml
中提到的图像设置路径public Uri getOutputMediaFileUri(int type) {
return Uri.fromFile(getOutputMediaFile(type));
}
/**
* returning image / video
*/
private File getOutputMediaFile(int type) {
// External sdcard location
File mediaStorageDir = new File(getExternalFilesDir(Environment.DIRECTORY_PICTURES),
"SN");
// Create the storage directory if it does not exist
if (!mediaStorageDir.exists()) {
if (!mediaStorageDir.mkdirs()) {
Log.d("FileName::", "Oops! Failed create "
+ "SN" + " directory");
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
Locale.getDefault()).format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_IMAGE) {
mediaFile = new File(mediaStorageDir.getPath() + File.separator
+ "IMG_" + timeStamp + ".jpg");
} else {
return null;
}
mCurrentPhotoPath = mediaFile.getAbsolutePath();
return mediaFile;
}
现在选择这样的照片：
private void selectImage（）{
final CharSequence[] options = {"Camera", "Choose from Gallery"};
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Add Photo!");
builder.setItems(options, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (options[item].equals("Camera")) {
isCamera = 1;
if (checkandRequestPermission()) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
fileUri = FileProvider.getUriForFile(ActivityModifyProfile.this, getPackageName() + ".provider", getOutputMediaFile(MEDIA_TYPE_IMAGE));
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
} else {
fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
}
startActivityForResult(intent, 1);
}
} else if (options[item].equals("Choose from Gallery")) {
isCamera = 0;
if (checkandRequestPermission()) {
Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, 2);
}
}
}
});
builder.show();
}
将路径设置为位图，如下所示：
@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (resultCode == RESULT_OK) { if (requestCode == 1) { Log.d("myPath1:", mCurrentPhotoPath); Log.d("myPath2:", fileUri.getPath()); try { BitmapFactory.Options bitmapOptions = new BitmapFactory.Options(); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { bitmap1 = BitmapFactory.decodeFile(mCurrentPhotoPath, bitmapOptions); } else { bitmap1 = BitmapFactory.decodeFile(fileUri.getPath(), bitmapOptions); } imgProfile.setImageBitmap(bitmap1); } catch (Exception e) { e.printStackTrace(); } } else if (requestCode == 2) { Uri selectedImage = data.getData(); String[] filePath = {MediaStore.Images.Media.DATA}; Cursor c = getContentResolver().query(selectedImage, filePath, null, null, null); c.moveToFirst(); int columnIndex = c.getColumnIndex(filePath[0]); imagePath = c.getString(columnIndex); c.close(); bitmap1 = (BitmapFactory.decodeFile(imagePath)); imgProfile.setImageBitmap(bitmap1); } } }
答案 1 :(得分：0)
在oncreate（）
中的MainActivity.java中添加此代码 if (ContextCompat.checkSelfPermission(GoogleMapsActivity.this,
android.Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if ActivityCompat.shouldShowRequestPermissionRationale(GoogleMapsActivity.this,
android.Manifest.permission.READ_EXTERNAL_STORAGE)) {
} else {
ActivityCompat.requestPermissions(GoogleMapsActivity.this,
new String[]{android.Manifest.permission.READ_EXTERNAL_STORAGE},
MY_PERMISSIONS_REQUEST_READ_CONTACTS);
}
}
答案 2 :(得分：0)
最后我成功运行了应用程序。
1.在应用程序清单中声明提供者。
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.example.abhijeet.demo11.MainActivity.GenericFileProvider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths"/>
</provider>
2。在resource下创建xml包，并在那里添加provider_path.xml。
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="external_files" path="."/>
</paths>
3。改变
imageUri = Uri.fromFile(photo);
到
imageUri = FileProvider.getUriForFile(getApplicationContext(),"com.example.abhijeet.demo11.MainActivity.GenericFileProvider",photo);