系出名门Android(5) - 控件(View)之TextView, Button, ImageButton, ImageView, CheckBox-阿里云开发者社区

系出名门Android(5) - 控件(View)之TextView, Button, ImageButton, ImageView, CheckBox, RadioButton, AnalogClock, DigitalClock

作者： webabcd

介绍
在 Android 中使用各种控件(View)

TextView - 文本显示控件
Button - 按钮控件
ImageButton - 图片按钮控件
ImageView - 图片显示控件
CheckBox - 复选框控件
RadioButton - 单选框控件
AnalogClock - 钟表（带表盘的那种）控件
DigitalClock - 电子表控件

1、TextView 的 Demo
textview.xml

_TextView.java

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class _TextView extends Activity {

        @Override
         protected void onCreate(Bundle savedInstanceState) {
                 // TODO Auto-generated method stub
                 super.onCreate(savedInstanceState);
                 this.setContentView(R.layout.textview);

                 // 设置 Activity 的标题
                setTitle( "TextView");

                TextView txt = (TextView) this.findViewById(R.id.textView);
                 // 设置文本显示控件的文本内容，需要换行的话就用“\n”
                txt.setText( "我是 TextView\n显示文字用的");
        }
}

2、Button 的 Demo
button.xml

_Button.java

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

_ImageButton.java

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;

public class _ImageButton extends Activity {

        @Override
         protected void onCreate(Bundle savedInstanceState) {
                 // TODO Auto-generated method stub
                 super.onCreate(savedInstanceState);
                 this.setContentView(R.layout.imagebutton);

                setTitle( "ImageButton");

                ImageButton imgButton = (ImageButton) this.findViewById(R.id.imageButton);
                 // 设置图片按钮的背景
                imgButton.setBackgroundResource(R.drawable.icon01);

                 // setOnClickListener() - 响应图片按钮的鼠标单击事件
                imgButton.setOnClickListener( new Button.OnClickListener(){
                        @Override
                         public void onClick(View v) {
                                TextView txt = (TextView) _ImageButton. this.findViewById(R.id.textView);
                                txt.setText( "图片按钮被单击了");
                        }
                });
        }
}

4、ImageView 的 Demo
imageview.xml

_ImageView.java

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ImageView;

public class _ImageView extends Activity {

        @Override
         protected void onCreate(Bundle savedInstanceState) {
                 // TODO Auto-generated method stub
                 super.onCreate(savedInstanceState);
                 this.setContentView(R.layout.imageview);

                setTitle( "ImageView");

                ImageView imgView = (ImageView) this.findViewById(R.id.imageView);
                 // 指定需要显示的图片
                imgView.setBackgroundResource(R.drawable.icon01);
        }
}

5、CheckBox 的 Demo
checkbox.xml

_CheckBox.java

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;

public class _CheckBox extends Activity {

        @Override
         protected void onCreate(Bundle savedInstanceState) {
                 // TODO Auto-generated method stub
                 super.onCreate(savedInstanceState);
                 this.setContentView(R.layout.checkbox);

                setTitle( "CheckBox");

                CheckBox chk = (CheckBox) this.findViewById(R.id.chk1);
                 // setOnCheckedChangeListener() - 响应复选框的选中状态改变事件
                chk.setOnCheckedChangeListener( new CompoundButton.OnCheckedChangeListener() {
                        @Override
                         public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                                TextView txt = (TextView) _CheckBox. this.findViewById(R.id.textView);
                                txt.setText( "CheckBox01 的选中状态：" + String.valueOf(isChecked));
                        }
                });
        }
}

6、RadioButton 的 Demo
radiobutton.xml

<? 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" />

        
         < RadioGroup android:id ="@+id/radioGroup"
                 android:layout_width ="fill_parent" android:layout_height ="fill_parent"
                 android:checkedButton ="@+id/rad3" android:orientation ="horizontal"
                 android:gravity ="center_vertical|center_horizontal" >
                 < RadioButton android:text ="rad1" android:id ="@+id/rad1"
                         android:layout_width ="wrap_content" android:layout_height ="wrap_content" > </ RadioButton >
                 < RadioButton android:text ="rad2" android:id ="@+id/rad2"
                         android:layout_width ="wrap_content" android:layout_height ="wrap_content" > </ RadioButton >
                 < RadioButton android:text ="rad3" android:id ="@+id/rad3"
                         android:layout_width ="wrap_content" android:layout_height ="wrap_content" > </ RadioButton >
         </ RadioGroup >

</ LinearLayout >

_RadioButton.java

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

public class _RadioButton extends Activity {

        @Override
         protected void onCreate(Bundle savedInstanceState) {
                 // TODO Auto-generated method stub
                 super.onCreate(savedInstanceState);
                 this.setContentView(R.layout.radiobutton);

                setTitle( "RadioButton");

                RadioGroup group = (RadioGroup) this.findViewById(R.id.radioGroup);
                 // setOnCheckedChangeListener() - 响应单选框组内的选中项发生变化时的事件
                group.setOnCheckedChangeListener( new RadioGroup.OnCheckedChangeListener() {
                        @Override
                         public void onCheckedChanged(RadioGroup group, int checkedId) {
                                TextView txt = (TextView) _RadioButton. this.findViewById(R.id.textView);
                                txt.setText(((RadioButton)findViewById(checkedId)).getText() + " 被选中");
                        }
                });
        }
}

7、AnalogClock 的 Demo
analogclock.xml

<? 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" >

        
         < AnalogClock android:id ="@+id/analogClock"
                 android:layout_width ="wrap_content" android:layout_height ="wrap_content" >
         </ AnalogClock >

</ LinearLayout >

_AnalogClock.java

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;

public class _AnalogClock extends Activity {

        @Override
         protected void onCreate(Bundle savedInstanceState) {
                 // TODO Auto-generated method stub
                 super.onCreate(savedInstanceState);
                 this.setContentView(R.layout.analogclcok);

                setTitle( "AnalogClock");
        }
}

8、DigitalClock 的 Demo
digitalclock.xml

_DigitalClock.java

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;

public class _DigitalClock extends Activity {

        @Override
         protected void onCreate(Bundle savedInstanceState) {
                 // TODO Auto-generated method stub
                 super.onCreate(savedInstanceState);
                 this.setContentView(R.layout.digitalclcok);

                setTitle( "DigitalClcok");
        }
}

OK
[源码下载]

本文转自webabcd 51CTO博客，原文链接：http://blog.51cto.com/webabcd/342055 ，如需转载请自行联系原作者

系出名门Android(5) - 控件(View)之TextView, Button, ImageButton, ImageView, CheckBox

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