android 4種監聽方法

（1）自身類作為事件監聽器

package cn.edu.gdmec.s07150745.work5;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

private static final TAG="TAG"; 

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Button btn1 = (Button) findViewById(R.id.btn1);

btn1.setText("單擊");

btn1.setOnClickListener(this);

}

@Override

public void onClick(View v) {

       switch(v.getId()){

    case R.id.btn1:

Toast.makeText(this,"已單擊我...",Toast.LENGTH_SHORT).show();

Log.d(TAG, "已單擊");  

break;

}

}

}

（2）外部類作為事件監聽器：

package cn.edu.gdmec.s07150745.work5;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

public class Act2 extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_act2);

Button btn2 = (Button) findViewById(R.id.btn2);

btn2.setText("單擊");

btn2.setOnClickListener(new OuterClass("已單擊我..."));

}

}

class OuterClass implements View.OnClickListener{

private String str="已單擊我....";

public OuterClass(String str){

super();

this.str=str;

}

@Override

public void onClick(View v) {

System.out.println(str);

}

}

（3）内部類作為事件監聽器：

package cn.edu.gdmec.s07150745.work5;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class Act3 extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_act3);

Button btn3 = (Button) findViewById(R.id.btn3);

btn3.setText("單擊");

btn3.setOnClickListener(new OuterClass());

}

class OuterClass implements View.OnClickListener{

@Override

public void onClick(View v) {

Toast.makeText(Act3.this,"已單擊我...",Toast.LENGTH_SHORT).show();

System.out.println("已單擊我...");

}

}

}

（4）匿名類作為事件監聽器：

package cn.edu.gdmec.s07150745.work5;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class Act4 extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_act4);

Button btn4 = (Button) findViewById(R.id.btn4);

btn4.setText("單擊");

btn4.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

Toast.makeText(Act4.this,"已單擊我...",Toast.LENGTH_SHORT).show();

System.out.println("已單擊我...");

}

});

}

}

以上四種方法之後，在xml檔案中給每一個事件即activity裡面定義多一個android label即可。不忘在每個activity裡面添加如下藍色的一段代碼哦。

<activity android:name=".MainActivity" android:label="1">

<intent-filter>

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />

</intent-filter>

</activity>