三秒跳转

/**
* 三秒跳转

*/
private TextView textView;
private int Time = 3;
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg.what ==0){
if (Time>0) {
//时间–
Time–;
//给时间赋值
textView.setText(Time+“s”);
handler.sendEmptyMessageDelayed(0, 1000);
}else {
startActivity(new Intent(HandlerActivity.this,MainActivity.class));

                finish();
            }
        }
    };
};
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_handler);
    textView = findViewById(R.id.asd);
    handler.sendEmptyMessageDelayed(0,2000);
}

}

<?xml version="1.0" encoding="utf-8"?>

<TextView
    android:text="3S"
    android:id="@+id/asd"
    android:layout_alignParentRight="true"
    android:layout_width="20dp"
    android:background="@drawable/point"
    android:layout_height="20dp" />