java - OnTouch 触摸时不运行

Question

运行代码时没有收到任何错误，但触摸屏幕时没有任何反应。全局变量 select 的值应该改变，但没有任何反应。

这是代码

public class NonmultiplierSixGame extends AppCompatActivity {   
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_nonmultiplier_six_game);
  }
}

activity_nonmultiplier_six_game:

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

<android.support.constraint.ConstraintLayout   
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.alexandermain.example_5.NonmultiplierSixGame">





    <com.example.alexandermain.example_5.views.NonmultiplierSixView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/nonmultiplierSixView"
        android:background="@color/colorPrimary"
        />


</android.support.constraint.ConstraintLayout>

NonmultiplierSixView 类:

public class NonmultiplierSixView extends View implements View.OnTouchListener{



@Override
protected void onDraw(Canvas canvas){
//bunch of shapes
}


@Override
public boolean onTouch(View v, MotionEvent event) {
    switch(event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            Globals.SetSelect(1);
            break;
        case MotionEvent.ACTION_UP:
            Globals.SetSelect(2);
            break;

    }

    return true;
}



public NonmultiplierSixView(Context context, AttributeSet attrs) {
    super(context, attrs);
}
}

编辑:这是全局类公共(public)类全局变量{

public static int select=-2;
public static void SetSelect(int t) {
    select = t;
}
public static int GetSelect() {
    return(select);
}

}

Answer 1

当你实现OntouchListener时，你需要在你的Context上设置监听器。

只需将其添加到构造函数中即可:应该是这样的:

public NonmultiplierSixView(Context context, AttributeSet attrs) {
    super(context, attrs);
    setOnTouchListener(this);
}