Java中回调函数编写

来源：互联网发布：eclipse新建教程 java 编辑：程序博客网时间：2024/06/16 02:42

package XXX.utils;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import org.xmlpull.v1.XmlSerializer;import android.app.ProgressDialog;import android.content.ContentResolver;import android.content.ContentValues;import android.content.Context;import android.database.Cursor;import android.net.Uri;import android.os.Environment;import android.util.Xml;import android.widget.ProgressBar;/** * 短信的工具类 *  */public class SmsUtils {/** * 备份短信的回调接口 */public interface BackUpCallBack {/** * 开始备份的时候，设置进度的最大值 *  * @param max *            总进度 */public void beforeBackup(int max);/** * 备份过程中，增加进度 *  * @param progress *            当前进度 */public void onSmsBackup(int progress);}/** * 备份用户的短信 *  * @param context *            上下文 * @param BackUpCallBack *            备份短信的接口 */public static void backupSms(Context context, BackUpCallBack callBack)throws Exception {ContentResolver resolver = context.getContentResolver();File file = new File(Environment.getExternalStorageDirectory(),"backup.xml");FileOutputStream fos = new FileOutputStream(file);// 把用户的短信一条一条读出来，按照一定的格式写到文件里XmlSerializer serializer = Xml.newSerializer();// 获取xml文件的生成器（序列化器）// 初始化生成器serializer.setOutput(fos, "utf-8");serializer.startDocument("utf-8", true);serializer.startTag(null, "smss");Uri uri = Uri.parse("content://sms/");Cursor cursor = resolver.query(uri, new String[] { "body", "address","type", "date" }, null, null, null);// 开始备份的时候，设置进度条的最大值int max = cursor.getCount();// pb.setMax(max);// pd.setMax(max);callBack.beforeBackup(max);serializer.attribute(null, "max", max + "");int process = 0;while (cursor.moveToNext()) {Thread.sleep(500);String body = cursor.getString(0);String address = cursor.getString(1);String type = cursor.getString(2);String date = cursor.getString(3);serializer.startTag(null, "sms");serializer.startTag(null, "body");serializer.text(body);serializer.endTag(null, "body");serializer.startTag(null, "address");serializer.text(address);serializer.endTag(null, "address");serializer.startTag(null, "type");serializer.text(type);serializer.endTag(null, "type");serializer.startTag(null, "date");serializer.text(date);serializer.endTag(null, "date");serializer.endTag(null, "sms");// 备份过程中，增加进度process++;// pb.setProgress(process);// pd.setProgress(process);callBack.onSmsBackup(process);}cursor.close();serializer.endTag(null, "smss");serializer.endDocument();fos.close();}/** * 还原短信 *  * @param context * @param flag *            是否清理原来的短信 */public static void restoreSms(Context context, boolean flag) {Uri uri = Uri.parse("content://sms/");if (flag) {context.getContentResolver().delete(uri, null, null);}// 1.读取sd卡上的xml文件// Xml.newPullParser();// 2.读取max// 3.读取每一条短信信息，body date type address// 4.把短信插入到系统短息应用。ContentValues values = new ContentValues();values.put("body", "woshi duanxin de neirong");values.put("date", "1395045035573");values.put("type", "1");values.put("address", "5558");context.getContentResolver().insert(uri, values);}}

调用方式：

try {SmsUtils.backupSms(getApplicationContext(), new BackUpCallBack() {@Overridepublic void onSmsBackup(int progress) {pd.setProgress(progress);}@Overridepublic void beforeBackup(int max) {pd.setMax(max);}});runOnUiThread(new Runnable() {@Overridepublic void run() {Toast.makeText(AtoolsActivity.this, "备份成功", 0).show();}});} catch (Exception e) {e.printStackTrace();runOnUiThread(new Runnable() {@Overridepublic void run() {Toast.makeText(AtoolsActivity.this, "备份失败", 0).show();}});}finally{pd.dismiss();}

0 0