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

2013-06-13 21:26 816 查看
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

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 - 文本显示控件

    -->

    <TextView android:layout_width="fill_parent"

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

       

</LinearLayout>

_TextView.java

代码

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

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" />

   

     <!--

         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" />

   

    <!--

        ImageButton - 图片按钮控件

    -->   

    <ImageButton android:id="@+id/imageButton"

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

    </ImageButton>

   

</LinearLayout>

_ImageButton.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.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

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">

   

    <!--

        ImageView - 图片显示控件

    -->

    <ImageView android:id="@+id/imageView" android:layout_width="wrap_content"

        android:layout_height="wrap_content"></ImageView>

       

</LinearLayout>

_ImageView.java

代码

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

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" />

       

    <!--

        CheckBox - 复选框控件

    -->

    <CheckBox android:text="CheckBox01" android:id="@+id/chk1"

        android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox>

    <CheckBox android:text="CheckBox02" android:id="@+id/chk2"

        android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox>

    <CheckBox android:text="CheckBox03" android:id="@+id/chk3"

        android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox>

       

</LinearLayout>

_CheckBox.java

代码

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

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" />

       

    <!--

        RadioButton - 单选框控件

        RadioGroup - 对其内的单选框控件做分组

            checkedButton - 指定组内被选中的单选框的 ID

    -->

    <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

代码

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

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">

   

    <!--

        AnalogClock - 钟表(带表盘的那种)控件

    -->

    <AnalogClock android:id="@+id/analogClock"

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

    </AnalogClock>

   

</LinearLayout>

_AnalogClock.java

代码

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

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">

   

    <!--

        DigitalClock - 电子表控件

    -->

    <DigitalClock android:id="@+id/digitalClock"

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

    </DigitalClock>

   

</LinearLayout>

_DigitalClock.java

代码

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");

    }

}
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