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>
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); } }