工程目录:
一、内部类监听
MainActivity:
package com.example.demo_two;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.button).setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "单击了Button1", Toast.LENGTH_SHORT).show();
}
});
findViewById(R.id.button2).setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "单击了Button2", Toast.LENGTH_SHORT).show();
}
});
findViewById(R.id.button3).setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "单击了Button3", Toast.LENGTH_SHORT).show();
}
});
}
}
Layout:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="@+id/button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button1" />
<Button
android:id="@+id/button2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button2" />
<Button
android:id="@+id/button3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button3" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
二、多对象监听
MainActivity:
package com.example.demo_two;
import androidx.appcompat.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{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn1=findViewById(R.id.button);
btn1.setOnClickListener(this);
Button btn2=findViewById(R.id.button2);
btn2.setOnClickListener(this);
Button btn3=findViewById(R.id.button3);
btn3.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.button:
Toast.makeText(this, "单击了Button1", Toast.LENGTH_SHORT).show();
break;
case R.id.button2:
Toast.makeText(this, "单击了Button2", Toast.LENGTH_SHORT).show();
break;
case R.id.button3:
Toast.makeText(this, "单击了Button3", Toast.LENGTH_SHORT).show();
break;
}
}
}