1 package com.lgqrlchinese.heima76android_copysms;
  2 
  3 import android.Manifest;
  4 import android.content.pm.PackageManager;
  5 import android.database.Cursor;
  6 import android.net.Uri;
  7 import android.os.Environment;
  8 import android.support.v4.app.ActivityCompat;
  9 import android.support.v4.content.ContextCompat;
 10 import android.support.v7.app.AppCompatActivity;
 11 import android.os.Bundle;
 12 import android.util.Xml;
 13 import android.view.View;
 14 import android.widget.Toast;
 15 
 16 import org.xmlpull.v1.XmlSerializer;
 17 
 18 import java.io.File;
 19 import java.io.FileNotFoundException;
 20 import java.io.FileOutputStream;
 21 import java.io.IOException;
 22 
 23 public class MainActivity extends AppCompatActivity {
 24     //动态获取权限
 25     static final String[] PERMISSION = new String[]{
 26             Manifest.permission.READ_SMS,
 27             Manifest.permission.WRITE_EXTERNAL_STORAGE,
 28     };
 29 
 30     @Override
 31     protected void onCreate(Bundle savedInstanceState) {
 32         super.onCreate(savedInstanceState);
 33         setContentView(R.layout.activity_main);
 34 
 35         //动态获取权限
 36         MyPermission();
 37     }
 38 
 39     //点击按钮查询短信数据库内容，然后备份
 40     public void copyClick(View view) {
 41 
 42         try {
 43             //获取xml序列化实例
 44             XmlSerializer serializer = Xml.newSerializer();
 45             //设置序列化参数
 46             File file = new File(Environment.getExternalStorageDirectory().getPath(), "smsBackUp.xml");
 47             FileOutputStream fos = new FileOutputStream(file);
 48             serializer.setOutput(fos, "utf-8");
 49             //开始写xml文档的开头
 50             serializer.startDocument("utf-8", true);
 51             //开始写根节点
 52             serializer.startTag(null, "smss");
 53 
 54             //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
 55             Uri uri = Uri.parse("content://sms/");
 56             Cursor cursor = getContentResolver().query(uri, new String[]{"address", "date", "body"}, null, null, null);
 57             while (cursor.moveToNext()) {
 58                 String address = cursor.getString(0);
 59                 String date = cursor.getString(1);
 60                 String body = cursor.getString(2);
 61 
 62                 //写sms节点
 63                 serializer.startTag(null, "sms");
 64 
 65                 //写address节点
 66                 serializer.startTag(null, "address");
 67                 serializer.text(address);
 68                 serializer.endTag(null, "address");
 69 
 70                 //写body节点
 71                 serializer.startTag(null, "body");
 72                 serializer.text(body);
 73                 serializer.endTag(null, "body");
 74 
 75                 //写date节点
 76                 serializer.startTag(null, "date");
 77                 serializer.text(date);
 78                 serializer.endTag(null, "date");
 79 
 80                 serializer.endTag(null, "sms");
 81 
 82             }
 83 
 84             serializer.endTag(null, "smss");
 85             serializer.endDocument();
 86 
 87 
 88         } catch (FileNotFoundException e) {
 89             e.printStackTrace();
 90             System.out.println("异常1");
 91         } catch (IOException e) {
 92             e.printStackTrace();
 93             System.out.println("异常2");
 94         }
 95 
 96 
 97     }
 98 
 99     //动态获取权限
100     public void MyPermission() {
101         if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
102             //Android 6.0申请权限
103             ActivityCompat.requestPermissions(this, PERMISSION, 1);
104         } else {
105             Toast.makeText(this, "成功", Toast.LENGTH_SHORT).show();
106         }
107     }
108 
109 }

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

1                 if (address != null) {
2 
3                     serializer.startTag(null, "address");
4                     serializer.text(address);
5                     serializer.endTag(null, "address");
6                 } else {
7                     serializer.text("这是草稿");
8                 }