首页 > 系统 > Android > 正文

Android 实现监听的四种方法详解实例代码

2019-12-12 05:04:21
字体:
来源:转载
供稿:网友

直接上代码,大家可以参考下

(1)自身类作为事件监听器

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{@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Button btn1 = (Button) findViewById(R.id.btn1);btn1.setText("单击");btn1.setOnClickListener(this);}@Overridepublic void onClick(View v) {Toast.makeText(this,"已单击我...",Toast.LENGTH_SHORT).show();System.out.println("已单击我...");}} 

(2)外部类作为事件监听器:

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 {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_act2);Button btn2 = (Button) findViewById(R.id.btn2);btn2.setText("单击");btn2.setOnClickListener(new OuterClass("已单击我..."));}}class OuterClass implements View.OnClickListener{private String str="已单击我....";public OuterClass(String str){super();this.str=str;}@Overridepublic void onClick(View v) {System.out.println(str);}}

(3)内部类作为事件监听器:

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 {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_act3);Button btn3 = (Button) findViewById(R.id.btn3);btn3.setText("单击");btn3.setOnClickListener(new OuterClass());}class OuterClass implements View.OnClickListener{@Overridepublic void onClick(View v) {Toast.makeText(Act3.this,"已单击我...",Toast.LENGTH_SHORT).show();System.out.println("已单击我...");}}}

 (4)匿名类作为事件监听器:

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 {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_act4);Button btn4 = (Button) findViewById(R.id.btn4);btn4.setText("单击");btn4.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Toast.makeText(Act4.this,"已单击我...",Toast.LENGTH_SHORT).show();System.out.println("已单击我...");}});}} 

以上四种方法之后,在xml文件中给每一个事件即activity里面定义多一个android label即可。不忘在每个activity里面添加如下蓝色的一段代码哦。

<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>

感谢阅读,希望能帮助到大家,谢谢大家对本站的支持!

发表评论 共有条评论
用户名: 密码:
验证码: 匿名发表