Widget uses setimageviewbitmap method to set bug analysis

widget Inside ImageView Component settings bitmap problem

stay widget Inside ,Imageview Set up bitmap when , You can usually use

RemoteViews.setImageViewBitmap(R.id.imageview, bitmap)

to update ImageView, Using this method can easily cause the following problems ：

AppWidgetHostView: Error inflating RemoteViews : android.widget.RemoteViews$ActionException: android.widget.RemoteViews$ActionException: view: androidx.appcompat.widget.AppCompatImageView can't use method with RemoteViews: setImageBitmap(class android.graphics.Bitmap)

From the above error log analysis, the general meaning is ,AppCompatImageView Can't be in RemoteViews It uses setImageBitmap This method
But why？remoteViews Clearly provided setImageViewBitmap, Now I say it can't be used

Analysis of a ： This error log “can’t use method with RemoteViews” Where did it come from ？

method The essence is ImageView Of setImageBitmap Method ,klass.getName() Theoretically, what should be returned is ImageView, Because we are layout The components inside are ImageView; But from the log, it is AppCompatImageView, This is the key ; And this sentence ：

method.isAnnotationPresent(RemotableViewMethod.class)

intend method If there are comments on this method , And the notes contain RemotableViewMethod This class returns true, Return if not included false;
Let's see. ImageView Of setImageBitmap：

It does , explain ImageView There is no problem ; That reflects a problem from the log side ,kclass.getName() Indeed, the return is not ImageView It is a AppCompatImageView

Question why

Mingming RemoteViews The layout provided layout Inside is a ImageView, But in setImageBitmap Time is a AppCompatImageView; It is found that the general reason is AppCompatImageView yes ImageView Compatible types of , A lot of optimization , So sometimes the system will ImageView Replace with AppCompatImageView, And this AppCompatImageView Of setImageBitmap The method is not about RemotableViewMethod Annotations , So you get an error ;

solve

Put about AppCompat Library removal of , see build.gradle It introduces appcomapt library

 implementation 'androidx.appcompat:appcompat:1.3.1'

Delete this line of dependent libraries , The new compilation problem is solved ;