onInterceptTouchEvent() 与 onTouch() 事件分析

<?xml version="1.0" encoding="utf-8"?>
<com.tinno.intercepttouch.MyFrameLayout 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=".MainActivity">
    <TextView
        android:id="@+id/tv"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:background="#000000"
        android:text="Hello World!"
       />
</com.tinno.intercepttouch.MyFrameLayout>

public class MyFrameLayout extends FrameLayout  {
    public MyFrameLayout(@NonNull Context context) {
        super(context);
    }
    public MyFrameLayout(@NonNull Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }
    public MyFrameLayout(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }
    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                System.out.println("----onInterceptTouchEvent---ACTION_DOWN");
                return true;
           //     break;
            case MotionEvent.ACTION_POINTER_UP:
                System.out.println("----onInterceptTouchEvent---ACTION_POINTER_UP");
                break;
            case MotionEvent.ACTION_POINTER_DOWN:
                System.out.println("----onInterceptTouchEvent---ACTION_POINTER_DOWN");
                break;
            case MotionEvent.ACTION_MOVE:
                System.out.println("----onInterceptTouchEvent---ACTION_MOVE");
                break;
            case MotionEvent.ACTION_CANCEL:
            case MotionEvent.ACTION_UP:
                System.out.println("----onInterceptTouchEvent---ACTION_UP");
                break;
            default:
                throw new IllegalStateException("Unexpected value: " + event.getActionMasked());
        }
        return false;
    }
}

public class MainActivity extends AppCompatActivity  {
    TextView textView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = (TextView)findViewById(R.id.tv);
        textView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                switch (motionEvent.getActionMasked()) {
                    case MotionEvent.ACTION_DOWN:
                        System.out.println("----onTouch---ACTION_DOWN");
                    break;
                    case MotionEvent.ACTION_POINTER_UP:
                        System.out.println("----onTouch---ACTION_POINTER_UP");
                        break;
                    case MotionEvent.ACTION_POINTER_DOWN:
                        System.out.println("----onTouch---ACTION_POINTER_DOWN");
                        break;
                    case MotionEvent.ACTION_MOVE:
                        System.out.println("----onTouch---ACTION_MOVE");
                        break;
                    case MotionEvent.ACTION_CANCEL:
                    case MotionEvent.ACTION_UP:
                        System.out.println("----onTouch---ACTION_UP");
                        break;
                    default:
                        throw new IllegalStateException("Unexpected value: " + motionEvent.getActionMasked());
                }
                return true;
            }
        });
    }
}