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:andro />
</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:andro>
</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:andro>
</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:andro></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:andro></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:andro></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:andro>
</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:andro>
</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");
}
}