今天学习了通过两个按钮的点击监听事件。
private Button button1; private Button button2; private LinearLayout layout;
先声明按钮、布局LinearLayout
package com.example.cong.colorbutton;
import android.graphics.Color;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
private Button button1;
private Button button2;
private Button button3;
private LinearLayout layout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1= (Button) this.findViewById(R.id.button1);
button2= (Button) this.findViewById(R.id.button2);
button3= (Button) this.findViewById(R.id.button3);
layout= (LinearLayout) this.findViewById(R.id.layout);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
layout.setBackgroundColor(Color.RED);
}
});
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
layout.setBackgroundColor(Color.BLUE);
}
});
button3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
layout.setBackgroundColor(Color.GREEN);
}
});
}
}以下是xml的代码
在这里需要注意的是要明确LinearLayout的ID
android:id=“@+id/layout”
实现出来就是点哪个按钮，背景就变什么色。
