第11周作业

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package com.example.myapplication;    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"?> <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>