BitmapFactory:无法解码流:React Native的java.io.FileNotFoundExcepti

Question

当我从图像选择器中选择图像时，我会收到这个错误。直到我开始在应用程序中使用权限，我才得到它。以下是我的sdk版本：

compileSdkVersion 27
buildToolsVersion "27.0.3"
configurations {
all*.exclude group: 'com.android.support', module: 'support-v4'
all*.exclude group: 'com.android.support', module: 'support-annotations'
compile.exclude group: "org.apache.httpcomponents", module: "httpclient"
}

defaultConfig {
applicationId "com.myapp"
minSdkVersion 16
targetSdkVersion 27
versionCode 1
versionName "1.0"
multiDexEnabled true
ndk {
abiFilters "armeabi-v7a", "x86"
}

dexOptions {
javaMaxHeapSize "4g"
preDexLibraries = false
incremental true
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation "com.github.hotchemi:permissionsdispatcher:4.0.0-alpha1"
annotationProcessor "com.github.hotchemi:permissionsdispatcher-processor:4.0.0-alpha1"
implementation 'com.android.support:support-v13:27+'
implementation 'com.android.support:appcompat-v7:27+'
implementation "com.facebook.react:react-native:+"  // From node_modules
}

我阅读了其他问题来帮助我解决这个问题，并找到了以下权限的java代码：

private static final int PICK_FROM_GALLERY = 1;
ChoosePhoto.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick (View v){
try {
if (ActivityCompat.checkSelfPermission(EditProfileActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(EditProfileActivity.this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}, PICK_FROM_GALLERY);
} else {
Intent galleryIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(galleryIntent, PICK_FROM_GALLERY);
}
} catch (Exception e) {
e.printStackTrace();
}
}
});

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults)
{
switch (requestCode) {
case PICK_FROM_GALLERY:
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Intent galleryIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(galleryIntent, PICK_FROM_GALLERY);
} else {
//do something like displaying a message that he didn`t allow the app to access gallery and you wont be able to let him select from gallery
}
break;
}
}

我把它放在我的mainactivity.java文件的类中，得到了这个错误：error: <identifier> expected ChoosePhoto.setOnClickListener(new View.OnClickListener()。我不确定这是否可以解决权限错误。

Stacktrace:

07-22 17:59:03.978  8497  8497 D ViewRootImpl@39eadf9[UCropActivity]: MSG_WINDOW_FOCUS_CHANGED 0
07-22 17:59:03.992  8497  8497 E BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /storage/emulated/0/DCIM/IMMQY/IMG_20180722175858_942.jpg (No such file or directory)
07-22 17:59:03.996  8497  8497 W System.err: java.lang.Exception: Invalid image selected

本地代码：

componentDidMount(){
async function requestCameraPermission() {
try {
const granted = await PermissionsAndroid.request(
PermissionsAndroid.PERMISSIONS.CAMERA,
{
'title': 'Cool Photo App Camera Permission',
'message': 'Cool Photo App needs access to your camera ' +
'so you can take awesome pictures.'
}
)
if (granted === PermissionsAndroid.RESULTS.GRANTED) {
console.log("You can use the camera")
} else {
console.log("Camera permission denied")
}
} catch (err) {
console.warn(err)
}
}
}

Answer 1

有两件事1。你需要在清单中为外部读取存储添加权限，然后在你能够使用它之后，如果你使用的是23以上的api，那么你必须使用Easy权限。

写入：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

阅读：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

23以上：

private String[] galleryPermissions = {Manifest.permission.READ_EXTERNAL_STORAGE, 
Manifest.permission.WRITE_EXTERNAL_STORAGE};
if (EasyPermissions.hasPermissions(this, galleryPermissions)) {
pickImageFromGallery();
} else {
EasyPermissions.requestPermissions(this, "Access for storage",
101, galleryPermissions);
}

2. 在Android 4.4及更高版本中，即将删除它们。而你得到的uri已经没有路径了

您仍然可以通过InputStream(ContentResolver#openInputStream(Uri-Uri((或文件描述符访问文件内容。

这也适用于旧的安卓版本

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK && requestCode == 1 && null != data) {
decodeUri(data.getData());
}
}
public void decodeUri(Uri uri) {
ParcelFileDescriptor parcelFD = null;
try {
parcelFD = getContentResolver().openFileDescriptor(uri, "r");
FileDescriptor imageSource = parcelFD.getFileDescriptor();
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeFileDescriptor(imageSource, null, o);
// the new size we want to scale to
final int REQUIRED_SIZE = 1024;
// Find the correct scale value. It should be the power of 2.
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp < REQUIRED_SIZE && height_tmp < REQUIRED_SIZE) {
break;
}
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
// decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
Bitmap bitmap = BitmapFactory.decodeFileDescriptor(imageSource, null, o2);
imageview.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
// handle errors
} catch (IOException e) {
// handle errors
} finally {
if (parcelFD != null)
try {
parcelFD.close();
} catch (IOException e) {
// ignored
}
}
}

我希望这将帮助你

Answer 2

查看此网站：https://developer.android.com/training/permissions/requesting您可能没有AndroidManifest.xml文件中的相机权限。

另请参阅：https://facebook.github.io/react-native/docs/permissionsandroid问题可能是您没有React Native的相机权限。