我正在开发一个使用网格视图包含图像库的应用程序，我尝试了许多代码。我已在清单中获得许可。但这给了我这条线的错误，它告诉我托管已弃用了。
光标= Managedquery (MediaStore.images.thumbnails.external_content_uri，投影，null， null，mediastore.images.thumbnails.image_id(;
弃用的方法是导致错误还是由于光标造成的？
public class MainActivity extends Activity {
// Cursor used to access the results from querying for images on the SD card.
private Cursor cursor;
// Column index for the Thumbnails Image IDs.
private int columnIndex;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Set up an array of the Thumbnail Image ID column we want
String[] projection = {MediaStore.Images.Thumbnails._ID};
// Create the cursor pointing to the SDCard
cursor = managedQuery( MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,
projection, // Which columns to return
null, // Return all rows
null,
MediaStore.Images.Thumbnails.IMAGE_ID);
// Get the column index of the Thumbnails Image ID
columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);
GridView sdcardImages = (GridView) findViewById(R.id.gridView1);
sdcardImages.setAdapter(new ImageAdapter(this));
}
private class ImageAdapter extends BaseAdapter {
private Context context;
public ImageAdapter(Context localContext) {
context = localContext;
}
public int getCount() {
return cursor.getCount();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView picturesView;
if (convertView == null) {
picturesView = new ImageView(context);
// Move cursor to current position
cursor.moveToPosition(position);
// Get the current value for the requested column
int imageID = cursor.getInt(columnIndex);
// Set the content of the image based on the provided URI
picturesView.setImageURI(Uri.withAppendedPath(
MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, "" + imageID));
picturesView.setScaleType(ImageView.ScaleType.FIT_XY);
picturesView.setPadding(10, 10, 10, 10);
picturesView.setLayoutParams(new GridView.LayoutParams(100, 100));
}
else {
picturesView = (ImageView)convertView;
}
return picturesView;
}
}
}
02-24 20:07:25.632 25424-25424/? I/art: Not late-enabling -Xcheck:jni (already on)
02-24 20:07:25.634 25424-25424/? W/art: Unexpected CPU variant for X86 using defaults: x86
02-24 20:07:25.752 25424-25424/com.project.nuha.sdtotorial W/System:
ClassLoader referenced unknown path: /data/app/com.project.nuha.sdtotorial-
1/lib/x86
02-24 20:07:26.022 25424-25424/com.project.nuha.sdtotorial D/AndroidRuntime:
Shutting down VM
02-24 20:07:26.024 25424-25424/com.project.nuha.sdtotorial E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.project.nuha.sdtotorial, PID: 25424
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.project.nuha.sdtotorial/com.project.nuha.sdtotorial.MainActivity}: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/images/thumbnails from pid=25424, uid=10092 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/images/thumbnails from pid=25424, uid=10092 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
at android.os.Parcel.readException(Parcel.java:1683)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:183)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:135)
at android.content.ContentProviderProxy.query(ContentProviderNative.java:421)
at android.content.ContentResolver.query(ContentResolver.java:530)
at android.content.ContentResolver.query(ContentResolver.java:472)
at android.app.Activity.managedQuery(Activity.java:2234)
at com.project.nuha.sdtotorial.MainActivity.onCreate(MainActivity.java:36)
at android.app.Activity.performCreate(Activity.java:6662)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
在这种情况下，根异常是：
Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/images/thumbnails from pid=25424, uid=10092 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
您需要请求READ_EXTERNAL_STORAGE许可，包括处理运行时权限。文档中涵盖了权限的使用以及有关Android应用程序开发的书籍和课程。