Android短信备份及数据插入实现代码解析
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
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(); } } }
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