前言:如果对android回调的概念不明白的请看:android 回调函数一:基本概念
1、定义接口
package com.app.util; public interface ZYJCallBack { public void dataResult( String resultString ) ; public void progress( Integer progress ) ; public void start() ; }
2、实体
package com.app.util; import android.os.AsyncTask; public class ZYJAsyncTask extends AsyncTask< String , Integer , String > { ZYJCallBack zyjCallBack ; //开始 @Override protected void onPreExecute() { super.onPreExecute(); zyjCallBack.start(); } /** * 特别注意:publishProgress( 10 ); * 这一句一定要写,否则 onProgressUpdate() ,这个方法不会被回调 */ @Override protected String doInBackground(String... params) { publishProgress( 10 ); publishProgress( 20 ); publishProgress( 50 ); publishProgress( 100 ); return "哈哈哈,操作完成了" ; } //onProgressUpdate方法用于更新进度信息 @Override protected void onProgressUpdate(Integer... progresses) { zyjCallBack.progress( progresses[0] ); } @Override protected void onPostExecute(String result) { super.onPostExecute(result); zyjCallBack.dataResult( result ); } public void setCallBackListener(ZYJCallBack zyjCallBack){ this.zyjCallBack = zyjCallBack ; } }
3、回调
package com.android10; import com.app.util.ZYJAsyncTask; import com.app.util.ZYJCallBack; import android.app.Activity; import android.os.Bundle; public class MainActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView( R.layout.activity_main ); ZYJAsyncTask zyjAsyncTask = new ZYJAsyncTask() ; zyjAsyncTask.setCallBackListener( new ZYJCallBack() { @Override public void start() { System.out.println("ssss开始了" ) ; } @Override public void progress(Integer progress) { System.out.println("ssss进度为: " + progress ) ; } @Override public void dataResult(String resultString) { System.out.println("ssss结果是:" + resultString ) ; } }); zyjAsyncTask.execute( "" ) ; } }
4、运行结果
ssss开始了
ssss进度为: 10
ssss进度为: 20
ssss进度为: 50
ssss进度为: 100
ssss结果是:哈哈哈,操作完成了
时间: 2024-10-04 10:13:29