由于我已经使用FileProvider将我的应用程序迁移到Android N,因此无法在手机图库中看到我的图片(即使版本低于Android N)。所以我创建了一个小测试应用程序来调试它,但没有成功。
在我的清单中
<uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.camera"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MANAGE_DOCUMENTS"/>
<application
...>
...
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="${applicationId}.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths"></meta-data>
</provider>
</application>
在file_paths.xml
中<paths>
<external-files-path
name="test_images"
path="Pictures/TestPictures"/>
</paths>
我制作了一个显示最后拍摄照片的小活动,以确保URI正确无误:
private final static int REQUEST_CAMERA = 1102;
public static final String CAMERA_IMAGES_DIR = "TestPictures";
String mOutputFilePath;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
onCamera();
}
});
}
public void onCamera() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (intent.resolveActivity(getPackageManager()) != null) {
File photoFile = createImageFile();
Uri photoURI = FileProvider.getUriForFile(this,
getPackageName() + ".fileprovider",
photoFile);
mOutputFilePath = photoFile.getAbsolutePath();
intent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(intent, REQUEST_CAMERA);
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK && requestCode == REQUEST_CAMERA)
onCaptureImageResult();
}
private void onCaptureImageResult() {
if (mOutputFilePath != null) {
File f = new File(mOutputFilePath);
Uri finalUri = Uri.fromFile(f);
galleryAddPic(finalUri);
((ImageView) findViewById(R.id.imageView)).setImageURI(finalUri);
}
}
public File createImageFile() {
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = new File(getExternalFilesDir(Environment.DIRECTORY_PICTURES), CAMERA_IMAGES_DIR + "/");
if (!storageDir.exists())
storageDir.mkdir();
return new File(storageDir, imageFileName + ".jpg");
}
private void galleryAddPic(Uri contentUri) {
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, contentUri);
sendBroadcast(mediaScanIntent);
}
我的照片在我的应用程序和我的文件浏览器中就像预期的那样,但我无法在照片库中看到它。 我试图使用FileProvider Uri,这也不行。
答案 0 :(得分:2)
问题似乎是要添加到图库的文件的位置,而不是添加它的方式。
getExternalFilesDir(Environment.DIRECTORY_PICTURES)不适用于媒体扫描,但 Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)可以。但是,我们无法使用FileProvider中的最后一个,因此我需要在公共目录中创建拍摄照片的副本。
我更新了我的代码:
private void onCaptureImageResult() {
if (mOutputFilePath != null) {
File f = new File(mOutputFilePath);
try {
File publicFile = copyImageFile(f);
Uri finalUri = Uri.fromFile(publicFile);
galleryAddPic(finalUri);
((ImageView) findViewById(R.id.imageView)).setImageURI(finalUri);
} catch (IOException e) {
e.printStackTrace();
}
}
}
public File copyImageFile(File fileToCopy) throws IOException {
File storageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), CAMERA_IMAGES_DIR + "/");
if (!storageDir.exists())
storageDir.mkdir();
File copyFile = new File(storageDir, fileToCopy.getName());
copyFile.createNewFile();
copy(fileToCopy, copyFile);
return copyFile;
}
public static void copy(File src, File dst) throws IOException {
InputStream in = new FileInputStream(src);
OutputStream out = new FileOutputStream(dst);
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
in.close();
out.close();
}