可能重复但找不到任何解决方案。
我正在尝试使用MediaStore
修改图像并将其保存到设备。以下代码:
public class Utils {
private Utils() {
}
static Uri getUri(Context context, Bitmap bitmap) {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
String path = MediaStore.Images.Media.insertImage(context.getContentResolver(), bitmap, "Title", null); //returning null in some devices
Log.d("TAG", "getUri: "+path);
return Uri.parse(path); //this is returning null which cause the app crash
}
static Bitmap getBitmap(Context context, Uri uri) throws IOException {
return MediaStore.Images.Media.getBitmap(context.getContentResolver(), uri);
}
}
此代码在大多数设备中运行良好,但问题是MediaStore.Images.Media.insertImage
在某些设备中返回null,例如:
1 。三星J7(2016)
2 。lg magna lte
3 。Android Emulator API 21
我感到惊讶,这个应用程序正在 Android Emulator API 26 中使用。但是在上崩溃了Android Emulator API 21
我已经搜索过Google,在这里也发现了同样的问题,但找不到任何足够的答案。
注意 - :我使用了读/写入外部存储
的运行时许可,但仍在上述设备中崩溃。以下是我的崩溃日志 -
Fatal Exception: java.lang.RuntimeException: Failure delivering result ResultInfo{who=android:fragment:0, request=1, result=-1, data=Intent { dat=content://com.android.providers.media.documents/document/image:51 flg=0x1 }} to activity {com.example/com.scanlibrary.ScanActivity}: java.lang.NullPointerException: uriString
at android.app.ActivityThread.deliverResults(ActivityThread.java:3574)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3617)
at android.app.ActivityThread.access$1300(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1352)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Method.java)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by java.lang.NullPointerException: uriString
at android.net.Uri$StringUri.<init>(Uri.java:470)
at android.net.Uri$StringUri.<init>(Uri.java:460)
at android.net.Uri.parse(Uri.java:432)
at com.scanlibrary.Utils.getUri(Utils.java:24)
at com.scanlibrary.PickImageFragment.postImagePick(PickImageFragment.java:228)
at com.scanlibrary.PickImageFragment.onActivityResult(PickImageFragment.java:208)
at android.app.Activity.dispatchActivityResult(Activity.java:6196)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3570)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3617)
at android.app.ActivityThread.access$1300(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1352)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Method.java)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
谢谢
而不是使用以下代码 - :
String path = MediaStore.Media.insertImage(context.getContentResolver(),bitmap,"Title",null);
使用此代码(下图) - :
ContentValues values=new ContentValues();
values.put(MediaStore.Images.Media.TITLE,"Title");
values.put(MediaStore.Images.Media.DESCRIPTION,"From Camera");
Uri path=getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,values);
如果不起作用,则将值通过为null。
protected void onActivityResult(int requestCode, int resultCode,Intent data) {
if (requestCode == RequestPermissionCode && resultCode == RESULT_OK) {
try {
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, filePathColumn, null, null, null);
if (cursor == null)
return;
// find the file in the media area
cursor.moveToLast();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String filePath = "file:///"+cursor.getString(columnIndex);
cursor.close();
actualImage = FileUtil.from(this,Uri.parse(filePath));
actualImageView.setImageBitmap(BitmapFactory.decodeFile(actualImage.getAbsolutePath()));
} catch (Exception e) {
Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_LONG).show();
}
}
}
使用OnActVittyResult方法,我希望它能起作用。