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(); } } } |
调用
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pd = new progressdialog(this); pd.setprogressstyle(progressdialog.style_horizontal); smsbackuputils.smsbackup(supertoolactivity.this, pd); |
以上就是本文的全部内容，希望对大家的学习有所帮助。
