Android实现支持进度条显示的短信备份工具类
使用内容提供者读取短信内容，写入XML文件，进度条ProgressDialog更新备份进度。
新知识点：子线程如何在在不使用Handler的情况下更新UI
/**
*进行短信备份的工具类，支持进度条显示
*@authorlian
*
*/
publicclassSmsBackupUtils{
privatestaticclassData{
intprogress;
}
/**
*
*@paramcontext
*调用此工具类的Activity
*@parampd
*显示备份进度的进度条
*/
publicstaticvoidsmsBackup(Activitycontext,finalProgressDialogpd){
Uriuri=Uri.parse("content://sms/");
ContentResolvercr=context.getContentResolver();
//取出短信
finalCursorcursor=cr.query(uri,newString[]{"address","date","body","type"},null,null,null);
finalintcount=cursor.getCount();
finalDatadata=newData();
data.progress=0;
//存储路径
Filefile=newFile(Environment.getExternalStorageDirectory(),"sms.xml");
try{
FileOutputStreamfos=newFileOutputStream(file);
PrintWriterpw=newPrintWriter(fos);
//按照XML格式进行写入
pw.println("<smsescount='"+cursor.getCount()+"'>");
//在主线程中更新UI
context.runOnUiThread(newRunnable(){
@Override
publicvoidrun(){
//TODOAuto-generatedmethodstub
pd.setMax(count);
pd.show();
}
});
//写入XML文件
while(cursor.moveToNext()){
data.progress++;
Stringaddress=cursor.getString(0);
Stringdate=cursor.getString(1);
Stringbody=cursor.getString(2);
Stringtype=cursor.getString(3);
//SystemClock.sleep(150);
pw.println("<sms>");
pw.println("<address>"+address+"</address>");
pw.println("<date>"+date+"</date>");
pw.println("<body>"+body+"</body>");
pw.println("<type>"+type+"</type>");
pw.println("</sms>");
context.runOnUiThread(newRunnable(){
@Override
publicvoidrun(){
//TODOAuto-generatedmethodstub
pd.setProgress(data.progress);
}
});
}
pw.println("</smses>");
pw.flush();
pw.close();
cursor.close();
//备份完成，关闭进度条
context.runOnUiThread(newRunnable(){
@Override
publicvoidrun(){
//TODOAuto-generatedmethodstub
pd.dismiss();
}
});
}catch(Exceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
}
调用
pd=newProgressDialog(this); pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); SmsBackupUtils.smsBackup(SuperToolActivity.this,pd);
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