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

来源：互联网发布：张店淘宝客服招聘编辑：程序博客网时间：2024/04/18 19:20

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

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 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

_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 {

        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

代码
package com.webabcd.view;

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

public class _ImageView extends Activity {

        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

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 {

        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" />

    
    <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 {

        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 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 {

setTitle("AnalogClock");
}
}

8、DigitalClock 的 Demo
digitalclock.xml

_DigitalClock.java

代码
package com.webabcd.view;

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

public class _DigitalClock extends Activity {

setTitle("DigitalClcok");
}
}