android 监听器

最新推荐文章于 2021-05-26 03:52:58 发布

原创最新推荐文章于 2021-05-26 03:52:58 发布 · 459 阅读

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activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" 
    android:orientation="vertical"
    >

    <Button
        android:id="@+id/bt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" 
        android:onClick="click"/>
   
</LinearLayout>

1.方法一匿名内部类

public class MainActivity extends Activity {

	 protected void onCreate(Bundle savedInstanceState) {
		 super.onCreate(savedInstanceState);
		 setContentView(R.layout.activity_main);
		 Button bt = (Button)findViewById(R.id.bt);
		 bt.setOnClickListener(
				 new OnClickListener(){//匿名内部类对象

					@Override
					public void onClick(View v) {
						Toast.makeText(MainActivity.this, "click Button", Toast.LENGTH_SHORT).show();//注意this MainActivity.this
					}});
	 }

}

方法二实现OnClickListener接口

public class MainActivity extends Activity implements OnClickListener{
	
	protected void onCreate(Bundle savedInstanceState) {
		 super.onCreate(savedInstanceState);
		 setContentView(R.layout.activity_main);
		 Button bt = (Button)findViewById(R.id.bt);
		 bt.setOnClickListener(this);//将this当成对象传过去
	}
	
	@Override
	public void onClick(View v) {
		Toast.makeText(MainActivity.this, "click Button", Toast.LENGTH_SHORT).show();
	}
}

方法三新建一个接口对象

public class MainActivity extends Activity {

protected void onCreate(Bundle savedInstanceState) {
	 super.onCreate(savedInstanceState);
	 setContentView(R.layout.activity_main);
	 Button bt = (Button)findViewById(R.id.bt);
	 OnClickListener mylistener = new myOnClickListener();//新建一个接口对象
	 bt.setOnClickListener(mylistener);
}

class myOnClickListener implements OnClickListener{

	@Override
	public void onClick(View v) {
		Toast.makeText(MainActivity.this, "click Button", Toast.LENGTH_SHORT).show();
	}
	
}

}

方法四在xml文件中写onclick方法

public class MainActivity extends Activity {
	protected void onCreate(Bundle savedInstanceState) {
		 super.onCreate(savedInstanceState);
		 setContentView(R.layout.activity_main);
	}
	
	public void click(View v){
		Toast.makeText(MainActivity.this, "click Button", Toast.LENGTH_SHORT).show();
	}
}