The method you declare in the android:onClick attribute must have a signature exactly as shown above. Specifically, the method must:. Tip: If you need to change the radio button state yourself, use the setChecked boolean or toggle method.
Content and code samples on this page are subject to the licenses described in the Content License. App Basics. Build your first app. App resources. Resource types. App manifest file. Device compatibility. Multiple APK support. Tablets, large screens, and foldables. Build responsive UIs. Build for foldables. Getting started. Handling data. User input. Watch Face Studio. Health services. Creating watch faces. Android TV. Build TV Apps. Build TV playback apps. Help users find content on TV.
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App entry points. App shortcuts. App navigation. Navigation component. Besides being used for transmitting sound and television signals, radio is used for the transmission of data in coded form.
In the form of radar it is used also for sending out signals and picking up their reflections from objects in their path. Long-range radio signals enable astronauts to communicate with the earth from the moon and carry information from space probes as they travel to distant planets see space exploration.
For navigation of ships and aircraft the radio range , radio compass or direction finder , and radio time signals are widely used. Radio signals sent from global positioning satellites can also be used by special receivers for a precise indication of position see navigation satellite.
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