code perfect

app/src/main/AndroidManifest.xml

@@ -12,10 +12,17 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
+        <provider
+            android:name=".provider.MyContentProvider"
+            android:authorities="com.test.provider"
+            android:process=":remote"
+            android:enabled="true"
+            android:exported="true"/>
+
         <service
             android:name=".service.TestService1"
             android:enabled="true"
-            android:exported="true"></service>
+            android:exported="true" />
 
         <activity android:name=".TestServiceActivity" />
         <activity android:name=".WindowManagerActivity" />

app/src/main/java/com/mxdl/customview/MainActivity.java

 package com.mxdl.customview;
 
+import android.annotation.TargetApi;
 import android.app.Service;
 import android.content.Intent;
 
+import androidx.annotation.RequiresApi;
 import androidx.appcompat.app.AppCompatActivity;
+
+import android.net.Uri;
+import android.os.Build;
 import android.os.Bundle;
+import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
@@ -13,6 +19,11 @@ import android.widget.Button;
 
 import com.mxdl.customview.test.MainTestActivity;
 
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Locale;
+
 /**
  * Description: <MainActivity><br>
  * Author:      mxdl<br>
@@ -50,6 +61,18 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
         mBtnRectCapture.setOnClickListener(this);
         mBtnService.setOnClickListener(this);
 
+
+
+    }
+
+    @TargetApi(Build.VERSION_CODES.N)
+    public Locale getCurrentLocale() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            return getResources().getConfiguration().getLocales().get(0);
+        } else {
+            //noinspection deprecation
+            return getResources().getConfiguration().locale;
+        }
     }
 
     @Override
@@ -75,6 +98,11 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
                 break;
             case R.id.btn_service:
                 startActivity(new Intent(this, TestServiceActivity.class));
+
+                Uri uri = Uri.parse("content://com.test.provider");
+                getContentResolver().query(uri,null,null,null,null);
+                getContentResolver().query(uri,null,null,null,null);
+                getContentResolver().query(uri,null,null,null,null);
                 break;
         }
 
@@ -83,13 +111,13 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
 
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
-        getMenuInflater().inflate(R.menu.menu_test,menu);
+        getMenuInflater().inflate(R.menu.menu_test, menu);
         return super.onCreateOptionsMenu(menu);
     }
 
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
-        if(item.getItemId() == R.id.test){
+        if (item.getItemId() == R.id.test) {
             startActivity(new Intent(this, MainTestActivity.class));
         }
         return super.onOptionsItemSelected(item);

app/src/main/java/com/mxdl/customview/provider/MyContentProvider.java

+package com.mxdl.customview.provider;
+
+import android.content.ContentProvider;
+import android.content.ContentValues;
+import android.database.Cursor;
+import android.net.Uri;
+import android.util.Log;
+
+public class MyContentProvider extends ContentProvider {
+    public MyContentProvider() {
+    }
+
+    @Override
+    public int delete(Uri uri, String selection, String[] selectionArgs) {
+        // Implement this to handle requests to delete one or more rows.
+        Log.v("MYTAG", "delete");
+        return 0;
+    }
+
+    @Override
+    public String getType(Uri uri) {
+        Log.v("MYTAG", "getType");
+        return null;
+    }
+
+    @Override
+    public Uri insert(Uri uri, ContentValues values) {
+        Log.v("MYTAG", "insert...");
+        return null;
+    }
+
+    @Override
+    public boolean onCreate() {
+        Log.v("MYTAG", "onCreate...");
+        Log.v("MYTAG", "currThread:" + Thread.currentThread().getName());
+        return false;
+    }
+
+    @Override
+    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
+        Log.v("MYTAG", "query...");
+        Log.v("MYTAG", "currThread:" + Thread.currentThread().getName());
+        return null;
+    }
+
+    @Override
+    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
+        Log.v("MYTAG", "update...");
+        return 0;
+    }
+}

app/src/main/java/com/mxdl/customview/uml/ContentProvider.puml

+@startuml
+'ActivityThread.main
+'ActivityThread.attach
+'ActivityManagerService.attachApplication
+'ActivityManagerService.attachApplicationLocked
+'ApplicationThread.bindApplication
+'ActivityThread.handleBindApplication
+'ActivityThread.installContentProviders
+'ActivityThread.installProvider
+'ContentProvider.attachInfo
+'ContentProvider.onCreate
+ActivityThread -> ActivityThread : main
+ActivityThread -> ActivityThread :attach
+ActivityThread -> ActivityManagerService:attachApplication
+ActivityManagerService -> ActivityManagerService:attachApplicationLocked
+ActivityManagerService -> ApplicationThread:bindApplication
+ApplicationThread -> ActivityThread:handleBindApplication
+ActivityThread -> ActivityThread :installContentProviders
+ActivityThread -> ActivityThread :installContentProviders
+ActivityThread -> ActivityThread :installProvider
+ActivityThread -> ContentProvider :attachInfo
+ContentProvider -> ContentProvider :onCreate
+@enduml
\ No newline at end of file

app/src/main/java/com/mxdl/customview/uml/ContentResolver.puml

+@startuml
+
+'ContentResolver.query
+'ApplicationContentResolver.query
+'ActivityThread.acquireProvider
+'ActivityManagerService.getContentProvider
+'Transport.query
+'ContentProvider.query
+ContextImpl -> ContentResolver :query
+ContentResolver -> ApplicationContentResolver :query
+ApplicationContentResolver -> ActivityThread:acquireProvider
+ActivityThread -> ActivityManagerService:getContentProvider
+ActivityManagerService -> Transport:query
+Transport -> ContentProvider:query
+@enduml
\ No newline at end of file