Android----内容提供者

Android—–内容管理者

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代码块

ContentReader.javapackage www.wulian.com.contentprovider;import android.content.ContentResolver;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.Toast;import java.util.ArrayList;import java.util.List;public class ContentReader extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void btn_read(View view){        Uri uri=Uri.parse("content://sms/");        ContentResolver resolver=getContentResolver();        Cursor cursor=resolver.query(uri,new String[]{"address","date","type","body"},null,null,null);        List<SmsInfo> smsInfos=new ArrayList<SmsInfo>();        Log.d("_hello","_love");        Toast.makeText(this,"短信有"+cursor.getCount()+"条",Toast.LENGTH_SHORT).show();        while (cursor.moveToNext()){            String address=cursor.getString(0);            long date=cursor.getLong(1);            int type=cursor.getInt(2);            String body=cursor.getString(3);            SmsInfo smsInfo=new SmsInfo(date,type,body,address);            smsInfos.add(smsInfo);            Log.d("_hello","_hi");        }        cursor.close();  //备份    //    SmsUtils.backUpSms(smsInfoList,this);    }}''ContentReader.xml<?xml version="1.0" encoding="utf-8"?><RelativeLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:paddingBottom="@dimen/activity_vertical_margin"    tools:context=".ContentReader">  <Button      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="读取"      android:onClick="btn_read"/></RelativeLayout>SmsUtils.class需要备份的时候要加，还没测试过名字什么的是否正确package com.example.a01.tigongzhe.utils;import android.content.Context;import android.os.Environment;import android.util.Xml;import android.widget.Toast;import com.example.a01.tigongzhe.adapters.SmsInfo;import org.xmlpull.v1.XmlSerializer;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.util.List;/** * Created by 01 on 2017/6/18. */public class SmsUtils {    public static void backUpSms(List<SmsInfo> smsInfoList,Context context) throws IOException {        //创建序列化器serializer        XmlSerializer serializer= Xml.newSerializer();        //获取sd卡根目录的路径        File file=new File(Environment.getExternalStorageDirectory(),"sms.xml");        //获得输出流        FileOutputStream os=new FileOutputStream(file);        //设置编码方式        serializer.setOutput(os,"utf-8");        //写入xml文件标识        serializer.startDocument("utf-8",true);        serializer.startTag(null,"smss");        for(SmsInfo info:smsInfoList){            serializer.startTag(null,"sms");            serializer.attribute(null,"id",info.getId()+"");            serializer.startTag(null,"body");            serializer.text(info.getBody());            serializer.endTag(null,"body");            serializer.startTag(null,"type");            serializer.text(info.getType()+"");            serializer.endTag(null,"type");            serializer.startTag(null,"address");            serializer.text(info.getAddress());            serializer.endTag(null,"address");            serializer.startTag(null,"date");            serializer.text(info.getDate()+"");            serializer.endTag(null,"date");            serializer.endTag(null,"sms");        }        serializer.endTag(null,"smss");        serializer.endDocument();        Toast.makeText(context,"cg",Toast.LENGTH_LONG).show();    }}注册<uses-permission android:name="android.permission.READ_SMS"/><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/><uses-permission android:name="android.permission.SEND_SMS"/>SmsInfo.classpackage www.wulian.com.contentprovider;/** * Created by Administrator on 2017/3/13. */public class SmsInfo {    private long date;    public int getType() {        return type;    }    public void setType(int type) {        this.type = type;    }    public long getDate() {        return date;    }    public void setDate(long date) {        this.date = date;    }    public String getBody() {        return body;    }    public void setBody(String body) {        this.body = body;    }    public String getAddress() {        return address;    }    public void setAddress(String address) {        this.address = address;    }    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public int type;    public String body;    public String address;    public int id;//构造方法    public SmsInfo(long date,int type,String body,String address){        this.date=date;        this.type=type;        this.body=body;        this.address=address;    }}