Android 监听缩放和滑动事件

做了个手势控制的需求，比较简单，记录下
上代码~

public class CustomControlView extends View {
    private ScaleGestureDetector mScaleGestureDetector = null;
    private GestureDetector mGestureDetector;
    private float currentScale = 1f;
    private boolean canScale = true;
    OnControlListener onControlListener;

    public CustomControlView(Context context) {
        super(context);
        initView(context);
    }

    public CustomControlView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        initView(context);
    }

    private void initView(Context context) {
        mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
            @Override
            public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
                if (onControlListener != null)
                    onControlListener.onScroll(distanceX, distanceY);
                return true;
            }
        }, null, true);

        mScaleGestureDetector = new ScaleGestureDetector(context, new ScaleGestureDetector.SimpleOnScaleGestureListener() {
            @Override
            public boolean onScale(ScaleGestureDetector detector) {
                currentScale = currentScale * detector.getScaleFactor();
                if (onControlListener != null)
                    onControlListener.onScale(currentScale);
                return true;
            }
        });
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (canScale)
            mScaleGestureDetector.onTouchEvent(event);
        mGestureDetector.onTouchEvent(event);
        return true;
    }

    public void setOnControlListener(OnControlListener onControlListener) {
        this.onControlListener = onControlListener;
    }

    public void setCanScale(boolean canScale) {
        this.canScale = canScale;
    }

使用xml放自定义view

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <com.test.scaleapplication.CustomControlView
        android:id="@+id/ccv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/colorAccent" />
</RelativeLayout>

设置监听

 CustomControlView customControlView = findViewById(R.id.ccv);
        customControlView.setCanScale(true);
        customControlView.setOnControlListener(new OnControlListener() {
            @Override
            public void onScroll(float distanceX, float distanceY) {
                Log.e(TAG, "onScroll: " + distanceX + "---" + distanceY);
            }

            @Override
            public void onScale(float scale) {
                Log.e(TAG, "onScale: "+scale );
            }
        });

ok！收工~

本文地址：https://blog.csdn.net/weixin_35732062/article/details/108130927