在我们了解什么是生命之前,我们已将它消磨了一半。
本讲内容:Switch 开关控件和ToggleButton控件
示例一:
下面是res/layout/activity_main.xml 布局文件:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="WIFI设置"
android:textSize="20sp" />
<Switch
android:id="@+id/open"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginRight="10dp"
android:textOn="WIFI开启中"
android:textOff="WIFI关闭中"/>
</RelativeLayout>
下面是MainActivity主界面文件:
public class MainActivity extends Activity {
private Switch open;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
open=(Switch) findViewById(R.id.open);
open.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if(isChecked){
Toast.makeText(MainActivity.this, "打开WIFI", Toast.LENGTH_LONG).show();
}else{
Toast.makeText(MainActivity.this, "关闭WIFI", Toast.LENGTH_LONG).show();
}
}
});
}
}
示例二:
下面是res/layout/activity_main.xml 布局文件:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<!-- textOn:true textOff:false 默认是false-->
<ToggleButton
android:id="@+id/id_toggleButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textOff="关"
android:textOn="开"
android:checked="false"/>
<ImageView
android:id="@+id/id_imageView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/off"/>
</LinearLayout>
下面是MainActivity主界面文件:
public class MainActivity extends Activity implements OnCheckedChangeListener{
private ToggleButton tb;
private ImageView img;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
tb=(ToggleButton) findViewById(R.id.id_toggleButton);
img=(ImageView) findViewById(R.id.id_imageView);
tb.setOnCheckedChangeListener(this);
}
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
/*
*当tb被点击的时候,当前的方法会执行
* buttonView 代表被点击控件的本身
* isChecked 代表被点击的控件的状态
*/
img.setBackgroundResource(isChecked?R.drawable.on:R.drawable.off);
}
}