内容提供者

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

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

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="插入" />
</LinearLayout>

package com.example.myapplication2;

import androidx.appcompat.app.AppCompatActivity;

import android.content.ContentResolver;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
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 button1 = (Button)findViewById(R.id.button);
        Button button2 = (Button)findViewById(R.id.button2);


        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getMsgs();
            }
        });

        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                insertMsg();
            }
        });


    }

    private void getMsgs(){
        Uri uri = Uri.parse("content://sms/");
        ContentResolver resolver = getContentResolver();
        //获取的是哪些列的信息
        Cursor cursor = resolver.query(uri, new String[]{"address","date","type","body"}, null, null, null);
        while(cursor.moveToNext())
        {
            String address = cursor.getString(0);
            String date = cursor.getString(1);
            String type = cursor.getString(2);
            String body = cursor.getString(3);
            System.out.println("地址:" + address);
            System.out.println("时间:" + date);
            System.out.println("类型:" + type);
            System.out.println("内容:" + body);
            System.out.println("======================");
        }
        cursor.close();
    }


    private void insertMsg() {
        ContentResolver resolver = getContentResolver();
        Uri uri = Uri.parse("content://sms/");
        ContentValues conValues = new ContentValues();
        conValues.put("address", "123456789");
        conValues.put("type", 1);
        conValues.put("date", System.currentTimeMillis());
        conValues.put("body", "no zuo no die why you try!");
        resolver.insert(uri, conValues);
        Log.e("HeHe", "短信插入完毕~");
    }
}

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">Content Provider</string>
    <string name="action_settings">Settings</string>

</resources>