Android——按钮的事件监听

关于Button按钮的四种事件监听方法总结

首先我们在activity_main.xml里面先定义一个Button空间

<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"

    tools:context=".MainActivity" >

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:text="Button" />

</RelativeLayout>

好，现在要我们来看点击事件的四种写法：

1.最常见的一种写法——匿名的内部类做为事件监听器类

package com.basillee.blogdemo;

import android.os.Bundle;

import android.app.Activity;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity {

    private Button btnButton;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        btnButton=(Button)findViewById(R.id.button1);

        btnButton.setOnClickListener(new OnClickListener() {

            public void onClick(View arg0) {

                Toast.makeText(MainActivity.this, "button clicked", Toast.LENGTH_LONG).show();

            }

        });

    }

}

2.内部类做为监听器

package com.basillee.blogdemo;

import android.os.Bundle;

import android.app.Activity;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity {

	private Button btnButton;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		btnButton=(Button)findViewById(R.id.button1);

		MyClicked myClicked=new MyClicked();

		btnButton.setOnClickListener(myClicked);

	}

	private class MyClicked implements OnClickListener{

		@Override

		public void onClick(View arg0) {

			Toast.makeText(getApplicationContext(), "Button clicked!", Toast.LENGTH_LONG).show();

		}

	}

}

3.Activity直接实现OnClickListener接口

package com.basillee.blogdemo;

import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{

private Button btnButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnButton=(Button)findViewById(R.id.button1);
btnButton.setOnClickListener(this);
}
@Override
public void onClick(View arg0) {
Toast.makeText(this, "Button clicked!", Toast.LENGTH_LONG).show();
}

}

4.在布局文件中，用android：onClick属性指定对应的方法名实现

activity_main.xml代码如下：

<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"

    tools:context=".MainActivity" >

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:text="Button"

        android:onClick="myClick"/>

</RelativeLayout>

MainActivity.java代码如下：

package com.basillee.blogdemo;

import android.os.Bundle;

import android.app.Activity;

import android.view.View;

import android.widget.Toast;

public class MainActivity extends Activity {

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

	}

	public void myClick(View v){

		Toast.makeText(getApplicationContext(),"Button clicked!", Toast.LENGTH_LONG).show();

	}

}

巴特西

Android——按钮的事件监听

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