Android控件(View)之TextView, Button, ImageButton, ImageView, CheckBox

android:layout_height="fill_parent">

< TextView android:layout_width="fill_parent"

android:layout_height="wrap_content" android:id="@+id/textView" />

< !--

Button - 按钮控件

-->

< Button android:id="@+id/button"

android:layout_width="wrap_content" android:layout_height="wrap_content">

< /Button>

< /LinearLayout>

_Button.java

代码

package com.webabcd.view;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

public class _Button extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

this.setContentView(R.layout.button);

setTitle("Button");

Button btn = (Button) this.findViewById(R.id.button);

btn.setText("click me");

// setOnClickListener() - 响应按钮的鼠标单击事件

btn.setOnClickListener(new Button.OnClickListener(){

@Override

public void onClick(View v) {

TextView txt = (TextView) _Button.this.findViewById(R.id.textView);

txt.setText("按钮被单击了");

}

});

}

}

3、ImageButton 的 Demo

imagebutton.xml

代码

< ?xml version="1.0" encoding="utf-8"?>

< LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical" android:layout_width="fill_parent"

android:layout_height="fill_parent">

< TextView android:layout_width="fill_parent"

android:layout_height="wrap_content" android:id="@+id/textView" />