因為最近專案的需要，需要實現一個拖動效果，看了一下網上剛好有這種拖動效果的demo,程式碼大概如下：

 private void initListener(){
        screenWidth = getScreenWidth(this);//獲取螢幕寬度
        screenHeight = getScreenHeight(this) - getStatusHeight(MainActivity.this);//螢幕高度-狀態列
        testTv.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public
 
 boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {

                    case MotionEvent.ACTION_DOWN:
                        lastX = (int) event.getRawX();
                        lastY = (int) event.getRawY();
                        break;

                    case
 
 MotionEvent.ACTION_MOVE:
                        int dx = (int) event.getRawX() - lastX;
                        int dy = (int) event.getRawY() - lastY;

                        int top = v.getTop() + dy;


                        int left = v.getLeft() + dx;


                        if (top <= 0
 
) {
                            top = 0;
                        }
                        if (top >= screenHeight - testTv.getHeight() ) {
                            top = screenHeight - testTv.getHeight();
                        }
                        if (left >= screenWidth - testTv.getWidth()) {
                            left = screenWidth - testTv.getWidth();
                        }

                        if (left <= 0) {
                            left = 0;
                        }


                        v.layout(left, top, left+v.getWidth(), top+v.getHeight());

                        v.postInvalidate();

                        lastX = (int) event.getRawX();
                        lastY = (int) event.getRawY();

                break;
                case MotionEvent.ACTION_UP:
                break;

                }
                return true;//這裡根據專案需要選擇false與true
            }
        });
    }

可是我的專案本身是有塗鴉的介面，還有很多複雜的事件，發現會有很奇怪的效果，抖動很厲害，而且時不時回到原來的位置，後來發現這個v.layout(left, top, left+v.getWidth(), top+v.getHeight());可能不適合專案的需求，所以我想了另一種解法。程式碼如下：

 private void initListener(){
        screenWidth = getScreenWidth(this);//獲取螢幕寬度
        screenHeight = getScreenHeight(this) - getStatusHeight(MainActivity.this);//螢幕高度-狀態列
        testTv.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {

                    case MotionEvent.ACTION_DOWN:
                        lastX = (int) event.getRawX();
                        lastY = (int) event.getRawY();
                        break;

                    case MotionEvent.ACTION_MOVE:
                        int dx = (int) event.getRawX() - lastX;
                        int dy = (int) event.getRawY() - lastY;

                        int top = v.getTop() + dy;


                        int left = v.getLeft() + dx;


                        if (top <= 0) {
                            top = 0;
                        }
                        if (top >= screenHeight - testTv.getHeight() ) {
                            top = screenHeight - testTv.getHeight();
                        }
                        if (left >= screenWidth - testTv.getWidth()) {
                            left = screenWidth - testTv.getWidth();
                        }

                        if (left <= 0) {
                            left = 0;
                        }

                        RelativeLayout.LayoutParams param = new RelativeLayout.LayoutParams(v.getWidth(), v.getHeight());
                        param.leftMargin = left;
                        param.topMargin = top;
                        v.setLayoutParams(param);
//                        v.layout(left, top, left+v.getWidth(), top+v.getHeight());

                        v.postInvalidate();

                        lastX = (int) event.getRawX();
                        lastY = (int) event.getRawY();

                break;
                case MotionEvent.ACTION_UP:
                break;

                }
                return true;
            }
        });
    }

效果如下圖：

覺得可以了，不過要注意一些事項：鍵盤彈出需要自己處理一下（比如處理成彈出鍵盤就不能移動這些，不然會變形的），我覺得這種寫法可以應用於各種複雜的場景。好了，今天一些專案問題總結就到這裡了，希望對大家有幫助，程式碼也上傳了，地址如下:
http://download.csdn.net/detail/u013772458/9715171