Penulis From Developer.android.com: “A Switch is a two-state toggle switch widget that can select between two options. The user may drag the "thumb" back and forth to choose the selected option, or simply tap to toggle as if it were a checkbox. The text property controls the text displayed in the label for the switch, whereas the off and on text controls the text on the thumb…”
In this tutorial, we show you how to customize a Switch, add a click listener and get the setOnCheckedChangeListenerfor this Switch. Use Switch to control with media volume and wifi on device.
Here is a result of this tutorial:
Here is a result of this tutorial:
This project is developed in Eclipse 4.2.0.
1. First, modify the main layout of app. Open “res/layout/main.xml” file, add two switches, few textviews and a button.<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center">
<Button
android:id="@+id/button1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="Disable all switch"
android:layout_marginBottom="15dp"
android:onClick="button_click"/>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="@+id/switch1"
android:layout_alignParentLeft="true"
android:layout_marginBottom="10dp"
android:layout_marginLeft="20dp"
android:text="Media Volume"/>
<Switch
android:id="@+id/switch1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textOff="OFF"
android:textOn="ON"
android:layout_alignParentRight="true"
android:layout_marginRight="20dp"
android:onClick="onSwitchClicked"
android:thumb="@drawable/switch_bg"
android:track="@drawable/track_bg"
android:layout_marginBottom="15dp"/>
<TextView android:layout_below="@+id/switch1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="@+id/switch2"
android:layout_alignParentLeft="true"
android:layout_marginBottom="10dp"
android:layout_marginLeft="20dp"
android:text="Wifi"/>
<Switch android:layout_below="@+id/switch1"
android:id="@+id/switch2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textOff="OFF"
android:textOn="ON"
android:layout_alignParentRight="true"
android:layout_marginRight="20dp"
android:onClick="onSwitchClicked"
android:thumb="@drawable/switch_bg"
android:track="@drawable/track_bg"
android:layout_marginBottom="15dp"/>
</RelativeLayout>
<TextView android:id="@+id/textView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="27px"
android:layout_marginTop="15dp"
android:text="Show spinner choice"
android:gravity="center"
android:textColor="#CD2134"
android:textStyle="bold" />
</LinearLayout>
Note two attribute of Switch below:
android:thumb="@drawable/switch_bg"
android:track="@drawable/track_bg"
We need two xml files “switch_bg.xml” and “track_bg.xml” in folder drawable to customize for all switches:
res/drawable/switch_bg:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_enabled="false" android:drawable="@drawable/enable"/>
<item android:state_pressed="true" android:drawable="@drawable/press"/>
<item android:state_checked="true" android:drawable="@drawable/check_on"/>
<item android:drawable="@drawable/enable" />
</selector>
res/drawable/track_bg:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_enabled="false" android:drawable="@drawable/track_disable"/>
<item android:drawable="@drawable/track_default" />
</selector>
2. CODE.
2.1. Add click listener to all Switches
Use android:onClick attribute in the Switch XML definition:
android:onClick="onSwitchClicked "
Within the activity that hosts this layout, the following method handles the click event for all switches, one switch for ON/OFF Media Volume, and one for ON/OFF Wifi on device.
public void onSwitchClicked(View view) {
switch(view.getId()){
case R.id.switch1:
if(switch1.isChecked()) {
textview.setText("Switch 1 check ON by click on it");
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC,
8, 0);
}
else {
textview.setText("Switch 1 check OFF by click on it");
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC,
0, 0);
}
break;
case R.id.switch2:
if(switch2.isChecked()) {
textview.setText("Switch 2 check ON by click on it");
wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
wifiManager.setWifiEnabled(true);
}
else {
textview.setText("Switch 2 check OFF by click on it");
wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
wifiManager.setWifiEnabled(false);
}
break;
}
}
2.2. How to get the setOnCheckedChangeListener for Switch. This method is executed when the User drag the thumb or click on the Switch, and then do similar with onClick method of this Switch
switch1.setOnCheckedChangeListener(newCompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if (buttonView.isChecked()){
textview.setText("Switch 1 check ON by drag thumb");
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 8, 0); }
else{
textview.setText("Switch 1 check OFF by drag thumb");
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 0, 0);
}
}
});
switch2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if (buttonView.isChecked()){
textview.setText("Switch 2 check ON by drag thumb");
wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
wifiManager.setWifiEnabled(true);
}
else{
textview.setText("Switch 2 check OFF by drag thumb");
wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
wifiManager.setWifiEnabled(false);
}
}
});
2.3. Finally, add button onClick method to enable or disable all Switches
public void button_click(View view){
if(is_enable == true)
{
is_enable = false;
button.setText("Enable all switch");
textview.setText("Switch is Disable by click on button");
}
else{
is_enable = true;
button.setText("Disable all switch");
textview.setText("Switch is Enable by click on button");
}
switch1.setEnabled(is_enable);
switch2.setEnabled(is_enable);
}
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.UPDATE_DEVICE_STATS"></uses-permission>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>
3. DEMO
3.1. Run Application
3.2. When click on Switch 1 to ON/OFF Media Volume of device
3.3. When drag thumb on Switch 2 to ON/OF Wifi
4.4. Click on button to Enable or Disable all Switches
You can download all source codes of this tutorial from here
Reference: http://developer.android.com/reference/android/widget/Switch.html
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