android 外部监听事件

前段

<?xml version="1.0" encoding="utf-8"?>
<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.wuzuo.myapplication1.MainActivity">

<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="按钮1"
android:id="@+id/button1"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />

<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="按钮2"
android:id="@+id/button2"
android:layout_below="@+id/button1"
android:layout_centerHorizontal="true"
android:layout_marginTop="133dp" />
</RelativeLayout>


后端
package com.example.wuzuo.myapplication1;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
private Button bt1;
private Button bt2;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bt1 = (Button) findViewById(R.id.button1);
bt2 = (Button) findViewById(R.id.button2);
/* bt1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
System.out.println("wuzuodong");
}
});
bt2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
System.out.println("wzd");
}
});*/
bt1.setOnClickListener(new MyButton() {
@Override
public void onClick(View view) {
super.onClick(view);//调用父类的click 事件
Toast.makeText(MainActivity.this, "ssjjsisjis", 1).show();
}
}
);
bt2.setOnClickListener(new MyButton() {
@Override
public void onClick(View view) {
super.onClick(view);
Toast.makeText(MainActivity.this, "ffsdfdsd", 1).show();/*
* Toast是Android中用来显示显示信息的一种机制，而且Toast显示的时间有限
* ，过一定的时间就会自动消失。
*/
}
}
);
}
}
class MyButton implements OnClickListener{
@Override
public void onClick(View view) {
view.setAlpha(0.5f);

}
}