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
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/**
* 进行短信备份的工具类，支持进度条显示
* @author lian
*
*/
public class smsbackuputils {
private static class data{
int progress;
}
/**
*
* @param context
* 调用此工具类的activity
* @param pd
* 显示备份进度的进度条
*/
public static void smsbackup(activity context,final progressdialog pd){
uri uri = uri.parse("content://sms/");
contentresolver cr = context.getcontentresolver();
//取出短信
final cursor cursor = cr.query(uri, new string[]{"address","date","body","type"}, null, null, null);
final int count = cursor.getcount();
final data data = new data();
data.progress = 0;
//存储路径
file file = new file(environment.getexternalstoragedirectory(), "sms.xml");
try {
fileoutputstream fos = new fileoutputstream(file);
printwriter pw = new printwriter(fos);
//按照xml格式进行写入
pw.println("<smses count='" + cursor.getcount() +"'>");
//在主线程中更新ui
context.runonuithread(new runnable() {
@override
public void run() {
// todo auto-generated method stub
pd.setmax(count);
pd.show();
}
});
//写入xml文件
while(cursor.movetonext()){
data.progress ++;
string address = cursor.getstring(0);
string date = cursor.getstring(1);
string body = cursor.getstring(2);
string type = 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(new runnable() {
@override
public void run() {
// todo auto-generated method stub
pd.setprogress(data.progress);
}
});
}
pw.println("</smses>");
pw.flush();
pw.close();
cursor.close();
//备份完成，关闭进度条
context.runonuithread(new runnable() {
@override
public void run() {
// todo auto-generated method stub
pd.dismiss();
}
});
} catch (exception e) {
// todo auto-generated catch block
e.printstacktrace();
}
}
}
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调用
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pd = new progressdialog(this);
pd.setprogressstyle(progressdialog.style_horizontal);
smsbackuputils.smsbackup(supertoolactivity.this, pd);
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