Android中回调接口的使用

MainActivity如下:

package cn.testcallback;import android.os.Bundle;import android.app.Activity;/** * Demo描述: * Android中回调接口的使用 */public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);testCallBack();}private void testCallBack(){AskQuestion askQuestion=new AskQuestion();String questionString="Do you love me ?";System.out.println("The question is : "+questionString);askQuestion.askQuestion(questionString);}}

CallBackInterface如下:

package cn.testcallback;/** * 定义一个接口 * 接口中有一方法 */public interface CallBackInterface {public void answerQuestion(String result);}

AskQuestion如下:

package cn.testcallback;public class AskQuestion implements CallBackInterface{    public void askQuestion(final String questionString){    new Thread(){    public void run() {    AnswerQuestion answerQuestion=new AnswerQuestion();    answerQuestion.receiveQuestion(AskQuestion.this, questionString);    };    }.start();    }@Overridepublic void answerQuestion(String result) {        System.out.println("The answter is : "+result);}}

AnswerQuestion如下:

package cn.testcallback;public class AnswerQuestion {   public void receiveQuestion(CallBackInterface callBackInterface,String questionString){try {            Thread.sleep(3000);} catch (Exception e) {}String result="YES!!!";callBackInterface.answerQuestion(result);   }}

main.xml如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"   >    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="回调的使用"         android:layout_centerInParent="true"    /></RelativeLayout>

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