android request focus code example

Example 1: camera focus permission in android

<uses-feature android:name="android.hardware.camera.autofocus" android:required="false" />

Example 2: check which activity in focus in android

public class MyApplication extends Application {

  public static boolean isActivityVisible() {
    return activityVisible;
  }  

  public static void activityResumed() {
    activityVisible = true;
  }

  public static void activityPaused() {
    activityVisible = false;
  }

  private static boolean activityVisible;
}