Android短信备份及插入笔记

实现备份短信到xml文件和像短信中插入一条数据

一、实现短信将备份到xml文件中

在布局文件中定义一个按钮，定义点击事件为copyClick

MainActivity.java：

 package com.lgqrlchinese.heima76android_copysms;

 import android.Manifest;
 import android.content.pm.PackageManager;
 import android.database.Cursor;
 import android.net.Uri;
 import android.os.Environment;
 import android.support.v4.app.ActivityCompat;
 import android.support.v4.content.ContextCompat;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.util.Xml;
 import android.view.View;
 import android.widget.Toast;

 import org.xmlpull.v1.XmlSerializer;

 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;

 public class MainActivity extends AppCompatActivity {
     //动态获取权限
     static final String[] PERMISSION = new String[]{
             Manifest.permission.READ_SMS,
             Manifest.permission.WRITE_EXTERNAL_STORAGE,
     };

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

         //动态获取权限
         MyPermission();
     }

     //点击按钮查询短信数据库内容，然后备份
     public void copyClick(View view) {

         try {
             //获取xml序列化实例
             XmlSerializer serializer = Xml.newSerializer();
             //设置序列化参数
             File file = new File(Environment.getExternalStorageDirectory().getPath(), "smsBackUp.xml");
             FileOutputStream fos = new FileOutputStream(file);
             serializer.setOutput(fos, "utf-8");
             //开始写xml文档的开头
             serializer.startDocument("utf-8", true);
             //开始写根节点
             serializer.startTag(null, "smss");

             //短信数据库内容也通过内容提供者暴露出来，所以我们只需要通过内容解析者去操作数据库
             Uri uri = Uri.parse("content://sms/");
             Cursor cursor = getContentResolver().query(uri, new String[]{"address", "date", "body"}, null, null, null);
             while (cursor.moveToNext()) {
                 String address = cursor.getString(0);
                 String date = cursor.getString(1);
                 String body = cursor.getString(2);

                 //写sms节点
                 serializer.startTag(null, "sms");

                 //写address节点
                 serializer.startTag(null, "address");
                 serializer.text(address);
                 serializer.endTag(null, "address");

                 //写body节点
                 serializer.startTag(null, "body");
                 serializer.text(body);
                 serializer.endTag(null, "body");

                 //写date节点
                 serializer.startTag(null, "date");
                 serializer.text(date);
                 serializer.endTag(null, "date");

                 serializer.endTag(null, "sms");

             }

             serializer.endTag(null, "smss");
             serializer.endDocument();

         } catch (FileNotFoundException e) {
             e.printStackTrace();
             System.out.println("异常1");
         } catch (IOException e) {
             e.printStackTrace();
             System.out.println("异常2");
         }

     }

     //动态获取权限
     public void MyPermission() {
         if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
             //Android 6.0申请权限
             ActivityCompat.requestPermissions(this, PERMISSION, 1);
         } else {
             Toast.makeText(this, "成功", Toast.LENGTH_SHORT).show();
         }
     }

 }

当然权限是必要的

     <uses-permission android:name="android.permission.READ_SMS"/>
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 

这样就在SD卡根目录备份了xml文件

在真机6.0测试中遇到存储address崩溃问题，调试好久。先打印addredss，没有问题；存储死数据没有问题，最后发现在输出打印室有个address为null。查看手机，是因为有个短信草稿，我想了两个都能想到的的解决办法：

1.删除或发送手机里的草稿

2.在代码中进行判断

1                 if (address != null) {

                     serializer.startTag(null, "address");
                     serializer.text(address);
                     serializer.endTag(null, "address");
                 } else {
                     serializer.text("这是草稿");
                 }

二、向短信的数据库中插入数据（5.0及之后就不允许外部应用修改，直允许读取，不做过多记录）

 import android.Manifest;
 import android.content.ContentValues;
 import android.content.pm.PackageManager;
 import android.net.Uri;
 import android.support.v4.app.ActivityCompat;
 import android.support.v4.content.ContextCompat;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.Toast;

 public class MainActivity extends AppCompatActivity {
     //动态获取权限
     static final String[] PERMISSION = new String[]{
             Manifest.permission.READ_SMS,
     };

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

     //点击按钮在短信数据库插入数据
     public void insertClick(View view) {
         Uri uri = Uri.parse("ocntent://sms");
         ContentValues values = new ContentValues();
         values.put("address", "17865318803");
         values.put("body", "我是你的影子");
         values.put("date", System.currentTimeMillis());
         getContentResolver().insert(uri, values);
     }

     //动态获取权限
     public void MyPermission() {
         if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
             //Android 6.0申请权限
             ActivityCompat.requestPermissions(this, PERMISSION, 1);
         } else {
             Toast.makeText(this, "成功", Toast.LENGTH_SHORT).show();
         }
     }
 }