MainActivity.java 文件源码

/**
 * Launch the animation on the currentAnimatedVectorDrawable
 */
private void launchAnimBackup(){
    if(!backupRoundTripFirstLaunched) {
        if (backupRoundTrip.getLevel() == 1) {
            //then reverse
            backupRoundTrip.setLevel(0);
        } else {
            //then reverse
            backupRoundTrip.setLevel(1);
        }
    }else{
        backupRoundTripFirstLaunched=false;
    }
    //find the current AnimatedVectorDrawable displayed
    currentBackupDrawable = (AnimatedVectorDrawable) backupRoundTrip.getCurrent();
    //start the animation
    currentBackupDrawable.start();
}