Android Intent跳转时IntermediateActivity访问计数异常多增问题排查

• 首先看DragAndDrop类的onTouch方法逻辑：你对触摸事件的所有回调（ACTION_DOWN、ACTION_MOVE、ACTION_UP等）都会无差别触发check_success()校验，当圆形进入目标区域后，后续的连续触摸事件（比如拖动到位后的抬起动作）都会再次命中校验条件，导致多次调用startActivity启动IntermediateActivity。
• 其次注意visitCount是静态变量，每次IntermediateActivity的onCreate执行都会自增，多次启动Activity自然会导致计数多次累加。
• 还要排除Activity启动模式的影响，如果没有配置特殊启动模式，多次调用startActivity就会创建多个实例。

1. 限制跳转逻辑仅触发一次：在DragAndDrop中增加一个跳转标记位，避免重复触发跳转：

// 增加成员变量标记是否已经触发跳转
private boolean hasNavigated = false;

public void check_success(){
    // 已经跳转就直接返回
    if (hasNavigated) return;
    float centreX = img.getX() + img.getWidth()  / 2;
    float centreY = img.getY() + img.getHeight() / 2;
    float centreX_outline = img_outline.getX() + img_outline.getWidth()  / 2;
    float centreY_outline = img_outline.getY() + img_outline.getHeight() / 2;

    if((centreX >= centreX_outline-75) &&(centreX <= centreX_outline+75)
            && (centreY >= centreY_outline-75) &&(centreY <= centreY_outline+75)){
        // 标记为已跳转
        hasNavigated = true;
        // 原有振动逻辑不变
        Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            v.vibrate(VibrationEffect.createOneShot(500, VibrationEffect.DEFAULT_AMPLITUDE));
        } else {
            v.vibrate(500);
        }
        Intent i = new Intent(DragAndDrop.this, IntermediateActivity.class);
        startActivity(i);
        // 可选：调用finish()关闭当前DragAndDropActivity，避免回退栈残留
        finish();
    }
}

2. 优化校验触发时机：不要在所有触摸事件都调用校验，仅在ACTION_UP（手指抬起）的时候调用check_success()，减少无效校验也能避免连续事件触发多次跳转：

public boolean onTouch(View view, MotionEvent event) {
    final int X = (int) event.getRawX();
    final int Y = (int) event.getRawY();
    switch (event.getAction() & MotionEvent.ACTION_MASK) {
        case MotionEvent.ACTION_DOWN:
            RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams) view.getLayoutParams();
            _xDelta = X - lParams.leftMargin;
            _yDelta = Y - lParams.topMargin;
            break;
        case MotionEvent.ACTION_UP:
            // 仅手指抬起时校验是否成功
            check_success();
            break;
        case MotionEvent.ACTION_MOVE:
            // 原有拖动逻辑不变
            ViewGroup.MarginLayoutParams marginParams = new ViewGroup.MarginLayoutParams(img.getLayoutParams());
            int left = (int) event.getRawX() - (view.getWidth() / 2);
            int top = (int) event.getRawY() - (view.getHeight());
            marginParams.setMargins(left, top, 0, 0);
            RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(marginParams);
            img.setLayoutParams(layoutParams);
            break;
    }
    rootLayout.invalidate();
    return true;
}

3. 可选优化：给IntermediateActivity配置合适的启动模式，或者在跳转后关闭前一个Activity，避免回退栈中存在多个重复实例。

内容的提问来源于stack exchange，提问作者Ravish Jha