<provider
            android:authorities="com.flx.testapp.provider"
            android:name=".MyContentProvider"
            android:exported="true"/>

package com.flx.testcontentprovider;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class MyDatabaseHelper extends SQLiteOpenHelper {
    //_id, name, age

    final private static String DBNAME = "test.db";
    final public static String TABLE1 = "table1";
    final private static String SQL_CREATE_TAB = "CREATE TABLE TABLE1 " +
            "(_ID INTEGER PRIMARY KEY, NAME VARCHAR(20), AGE INT(10))";

    public MyDatabaseHelper(Context context) {
        super(context, DBNAME, null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(SQL_CREATE_TAB);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
　　　　//TODO
    }
}

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
import android.util.Log;

public class MyContentProvider extends ContentProvider {
    private MyDatabaseHelper mMyDatabaseHelper;
    final private static UriMatcher mUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
    final private static int TABLE1_CODE = 1;

    static {
        mUriMatcher.addURI("com.flx.testapp.provider", "table1", TABLE1_CODE);
    }

    @Override
    public boolean onCreate() {
        mMyDatabaseHelper = new MyDatabaseHelper(getContext());
        return true;
    }

    @Override
    public Cursor query(Uri uri,String[] projection,  String selection,  String[] selectionArgs,  String sortOrder) {
        SQLiteDatabase sqLiteDatabase = mMyDatabaseHelper.getWritableDatabase();
        Cursor cursor = null;
        if (mUriMatcher.match(uri) == TABLE1_CODE) {
            cursor = sqLiteDatabase.query(MyDatabaseHelper.TABLE1, projection, selection,selectionArgs,null,null,sortOrder);
            Log.d("flx_provider", "MyContentProvider->query()");
        } else {
            Log.d("flx_provider", "MyContentProvider->query() the patch is not match");
        }
        return cursor;
    }

    
    @Override
    public String getType(Uri uri) {
        return null;
    }

    
    @Override
    public Uri insert( Uri uri,  ContentValues values) {
        SQLiteDatabase sqLiteDatabase = mMyDatabaseHelper.getWritableDatabase();
        if(mUriMatcher.match(uri) == TABLE1_CODE) {
            long rowNum = sqLiteDatabase.insert(MyDatabaseHelper.TABLE1, null, values);
            Log.d("flx_provider", "MyContentProvider->insert() rowNum="+rowNum);
        } else {
            Log.d("flx_provider", "MyContentProvider->insert() the patch is not match");
        }
        return null;
    }

    @Override
    public int delete( Uri uri,  String selection,  String[] selectionArgs) {
        return 0;
    }

    @Override
    public int update( Uri uri,  ContentValues values,  String selection,  String[] selectionArgs) {
        return 0;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Button android:id="@+id/add_btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="AddData"/>

    <Button android:id="@+id/query_btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="QueryData" />

</LinearLayout>

import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button addButton = findViewById(R.id.add_btn);
        addButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.d("flx_provider", "ManiActivity->oncreate() addButton click");
                Uri uri = Uri.parse("content://com.flx.testapp.provider/table1");
                String names[] = {"AA", "BB", "CC"};
                int ages[] = {18, 19, 20};
                for (int i = 0;i < names.length;i++) {
                    ContentValues values = new ContentValues();
                    values.put("name", names[i]);
                    values.put("age", ages[i]);
                    getContentResolver().insert(uri, values);
                }
            }
        });

        Button queryBtn = findViewById(R.id.query_btn);
        queryBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.d("flx_provider", "ManiActivity->oncreate() queryBtn click");
                Uri uri = Uri.parse("content://com.flx.testapp.provider/table1");
                Cursor cursor = getContentResolver().query(uri, null, "name=?",
                        new String[]{"AA"},null);
                if (cursor != null && cursor.getCount() > 0) {
                    cursor.moveToFirst();
                    do {
                        Log.d("flx_provider", "ManiActivity->oncreate() query results:" + cursor.getString(0)
                                + "   " + cursor.getString(1) + "   " + cursor.getString(2));
                    } while (cursor.moveToNext());
                    cursor.close();
                }
            }
        });
    }
}