實(shí)現(xiàn)備份短信到xml文件和像短信中插入一條數(shù)據(jù)

一、實(shí)現(xiàn)短信將備份到xml文件中

在布局文件中定義一個(gè)按鈕，定義點(diǎn)擊事件為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 { //動(dòng)態(tài)獲取權(quán)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); //動(dòng)態(tài)獲取權(quán)限 MyPermission(); } //點(diǎn)擊按鈕查詢短信數(shù)據(jù)庫(kù)內(nèi)容，然后備份 public void copyClick(View view) { try { //獲取xml序列化實(shí)例 XmlSerializer serializer = Xml.newSerializer(); //設(shè)置序列化參數(shù) File file = new File(Environment.getExternalStorageDirectory().getPath(), 'smsBackUp.xml'); FileOutputStream fos = new FileOutputStream(file); serializer.setOutput(fos, 'utf-8'); //開始寫xml文檔的開頭 serializer.startDocument('utf-8', true); //開始寫根節(jié)點(diǎn) serializer.startTag(null, 'smss'); //短信數(shù)據(jù)庫(kù)內(nèi)容也通過(guò)內(nèi)容提供者暴露出來(lái)，所以我們只需要通過(guò)內(nèi)容解析者去操作數(shù)據(jù)庫(kù) 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);//寫sms節(jié)點(diǎn)serializer.startTag(null, 'sms');//寫address節(jié)點(diǎn)serializer.startTag(null, 'address');serializer.text(address);serializer.endTag(null, 'address');//寫body節(jié)點(diǎn)serializer.startTag(null, 'body');serializer.text(body);serializer.endTag(null, 'body');//寫date節(jié)點(diǎn)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('異常1'); } catch (IOException e) { e.printStackTrace(); System.out.println('異常2'); } } //動(dòng)態(tài)獲取權(quán)限 public void MyPermission() { if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) { //Android 6.0申請(qǐng)權(quán)限 ActivityCompat.requestPermissions(this, PERMISSION, 1); } else { Toast.makeText(this, '成功', Toast.LENGTH_SHORT).show(); } }}

當(dāng)然權(quán)限是必要的

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

這樣就在SD卡根目錄備份了xml文件

在真機(jī)6.0測(cè)試中遇到存儲(chǔ)address崩潰問(wèn)題，調(diào)試好久。先打印addredss，沒(méi)有問(wèn)題；存儲(chǔ)死數(shù)據(jù)沒(méi)有問(wèn)題，最后發(fā)現(xiàn)在輸出打印室有個(gè)address為null。查看手機(jī)，是因?yàn)橛袀€(gè)短信草稿，我想了兩個(gè)都能想到的的解決辦法：

1.刪除或發(fā)送手機(jī)里的草稿

2.在代碼中進(jìn)行判斷

if (address != null) { serializer.startTag(null, 'address'); serializer.text(address); serializer.endTag(null, 'address');} else { serializer.text('這是草稿');}

二、向短信的數(shù)據(jù)庫(kù)中插入數(shù)據(jù)（5.0及之后就不允許外部應(yīng)用修改，直允許讀取，不做過(guò)多記錄）

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 { //動(dòng)態(tài)獲取權(quán)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(); } //點(diǎn)擊按鈕在短信數(shù)據(jù)庫(kù)插入數(shù)據(jù) 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); } //動(dòng)態(tài)獲取權(quán)限 public void MyPermission() { if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) { //Android 6.0申請(qǐng)權(quán)限 ActivityCompat.requestPermissions(this, PERMISSION, 1); } else { Toast.makeText(this, '成功', Toast.LENGTH_SHORT).show(); } }}

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