我正在从官方文档中测试Android示例。我的应用程序与api 21及更高版本一起工作正常，但总是在api低于21的情况下崩溃，例如KitKat（api 19）。我没有直接使用相机，只能通过其他应用程序（制作并发送Intent）。
我当前的appcompat lib：com.android.support:appcompat-v7:27.0.2
我如何解决这个问题？
在此找到解决方案： https://medium.com/@a1cooke/using-v4-support-library-fileprovider-and-camera-intent-a45f76879d61
https://developer.android.com/training/camera/photobasics.html#TaskPath
LogCat在这里：
01-29 15:51:14.414 3090-3090/com.android.camera D/AndroidRuntime: Shutting down VM
01-29 15:51:14.414 1573-1632/system_process E/SoundPool: error loading /system/media/audio/ui/Effect_Tick.ogg
01-29 15:51:14.414 1573-1632/system_process W/AudioService: Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
01-29 15:51:14.414 1573-1632/system_process E/SoundPool: error loading /system/media/audio/ui/Effect_Tick.ogg
01-29 15:51:14.414 1573-1632/system_process W/AudioService: Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
01-29 15:51:14.414 1573-1632/system_process E/SoundPool: error loading /system/media/audio/ui/Effect_Tick.ogg
01-29 15:51:14.414 1573-1632/system_process W/AudioService: Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
01-29 15:51:14.414 1573-1632/system_process E/SoundPool: error loading /system/media/audio/ui/Effect_Tick.ogg
01-29 15:51:14.414 1573-1632/system_process W/AudioService: Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
01-29 15:51:14.414 1573-1632/system_process E/SoundPool: error loading /system/media/audio/ui/Effect_Tick.ogg
01-29 15:51:14.414 1573-1632/system_process W/AudioService: Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
01-29 15:51:14.414 1573-1632/system_process E/SoundPool: error loading /system/media/audio/ui/KeypressStandard.ogg
01-29 15:51:14.414 1573-1632/system_process W/AudioService: Soundpool could not load file: /system/media/audio/ui/KeypressStandard.ogg
01-29 15:51:14.414 1573-1632/system_process E/SoundPool: error loading /system/media/audio/ui/KeypressSpacebar.ogg
01-29 15:51:14.414 1573-1632/system_process W/AudioService: Soundpool could not load file: /system/media/audio/ui/KeypressSpacebar.ogg
01-29 15:51:14.414 1573-1632/system_process E/SoundPool: error loading /system/media/audio/ui/KeypressDelete.ogg
01-29 15:51:14.414 1573-1632/system_process W/AudioService: Soundpool could not load file: /system/media/audio/ui/KeypressDelete.ogg
01-29 15:51:14.414 1573-1632/system_process E/SoundPool: error loading /system/media/audio/ui/KeypressReturn.ogg
01-29 15:51:14.414 1573-1632/system_process W/AudioService: Soundpool could not load file: /system/media/audio/ui/KeypressReturn.ogg
01-29 15:51:14.414 1573-1632/system_process E/SoundPool: error loading /system/media/audio/ui/KeypressInvalid.ogg
01-29 15:51:14.414 1573-1632/system_process W/AudioService: Soundpool could not load file: /system/media/audio/ui/KeypressInvalid.ogg
01-29 15:51:14.414 1573-1632/system_process W/AudioService: onLoadSoundEffects(), Error -1 while loading samples
01-29 15:51:14.414 3090-3090/com.android.camera W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0xa4d75b20)
01-29 15:51:14.414 1573-1915/system_process W/ActivityManager: Permission Denial: opening provider android.support.v4.content.FileProvider from ProcessRecord{a538ebb8 3090:com.android.camera/u0a32} (pid=3090, uid=10032) that is not exported from uid 10057
01-29 15:51:14.414 3090-3090/com.android.camera E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.android.camera, PID: 3090
java.lang.IllegalStateException: Could not execute method of the activity
at android.view.View$1.onClick(View.java:3823)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at android.view.View$1.onClick(View.java:3818)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.SecurityException: Permission Denial: opening provider android.support.v4.content.FileProvider from ProcessRecord{a538ebb8 3090:com.android.camera/u0a32} (pid=3090, uid=10032) that is not exported from uid 10057
at android.os.Parcel.readException(Parcel.java:1465)
at android.os.Parcel.readException(Parcel.java:1419)
at android.app.ActivityManagerProxy.getContentProvider(ActivityManagerNative.java:2848)
at android.app.ActivityThread.acquireProvider(ActivityThread.java:4415)
at android.app.ContextImpl$ApplicationContentResolver.acquireUnstableProvider(ContextImpl.java:2207)
at android.content.ContentResolver.acquireUnstableProvider(ContentResolver.java:1425)
at android.content.ContentResolver.openAssetFileDescriptor(ContentResolver.java:906)
at android.content.ContentResolver.openOutputStream(ContentResolver.java:669)
at android.content.ContentResolver.openOutputStream(ContentResolver.java:645)
at com.android.camera.Camera.doAttach(Camera.java:1385)
at com.android.camera.Camera.onReviewDoneClicked(Camera.java:1362)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at android.view.View$1.onClick(View.java:3818)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
这里的简单代码：
<application>
...
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.example.android.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>
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="my_images" path="Android/data/com.example.package.name/files/Pictures" />
</paths>
String mCurrentPhotoPath;
static final int REQUEST_TAKE_PHOTO = 1;
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
...
}
}
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
mCurrentPhotoPath = image.getAbsolutePath();
return image;
}
private void dispatchTakePictureIntent() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
// Error occurred while creating the File
...
}
// Continue only if the File was successfully created
if (photoFile != null) {
Uri photoURI = FileProvider.getUriForFile(this,
"com.example.android.fileprovider",
photoFile);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
}
}
}
private void setPic() {
// Get the dimensions of the View
int targetW = mImageView.getWidth();
int targetH = mImageView.getHeight();
// Get the dimensions of the bitmap
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
// Determine how much to scale down the image
int scaleFactor = Math.min(photoW/targetW, photoH/targetH);
// Decode the image file into a Bitmap sized to fill the View
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor;
bmOptions.inPurgeable = true;
Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
mImageView.setImageBitmap(bitmap);
}
答案 0 :(得分：0)
将FLAG_GRANT_READ_URI_PERMISSION添加到takePictureIntent。目前，相机应用程序无权使用Uri。
有关ACTION_IMAGE_CAPTURE与FileProvider一起使用的完整实施，请参见this sample app。