android 控件拖動並添加歸位動畫

用兩種簡單實現方式：

第一種：

 relBottom.setOnTouchListener(new View.OnTouchListener() {
            private int downX;
            private int downY;

            private int viewLeft;
            private int viewRight;
            private int viewTop;
            private int viewBottom;

            @Override
            public boolean onTouch(final View v, MotionEvent event) {
                switch (event.getAction()) {
                    case MotionEvent.ACTION_DOWN:
                        isMoving=false;

                        //按下位置
                        downX = (int) event.getRawX();
                        downY = (int) event.getRawY();

                        //初始位置
                        viewLeft=v.getLeft();
                        viewRight=v.getRight();
                        viewTop=v.getTop();
                        viewBottom=v.getBottom();


                        break;
                    case MotionEvent.ACTION_MOVE:
                        int moveX = (int) event.getRawX();
                        int moveY = (int) event.getRawY();

                        int dx = moveX - downX;
                        int dy = moveY - downY;

                        int l = v.getLeft();
                        int r = v.getRight();
                        int t = v.getTop();
                        int b = v.getBottom();


                        // 更新位置
                               v.layout(l + dx, t + dy, r + dx, b + dy);


                        // 下一次按下位置
                        downX = (int) event.getRawX();
                        downY = (int) event.getRawY();
                        break;
                    case MotionEvent.ACTION_UP:


                        //歸位
                               v.layout(viewLeft,viewTop,viewRight,viewBottom);

                        break;
                }

                return true;
            }
        });

第二種：

 relBottom.setOnTouchListener(new View.OnTouchListener() {
            private int downX;
            private int downY;

            @Override
            public boolean onTouch(final View v, MotionEvent event) {
                switch (event.getAction()) {
                    case MotionEvent.ACTION_DOWN:
                        isMoving=false;

                        //按下位置
                        downX = (int) event.getRawX();
                        downY = (int) event.getRawY();


                        break;
                    case MotionEvent.ACTION_MOVE:
                        int moveX = (int) event.getRawX();
                        int moveY = (int) event.getRawY();

                        int dx = moveX - downX;
                        int dy = moveY - downY;

                       float translationX=v.getTranslationX()+dx;
                       float translationY=v.getTranslationY()+dy;

                        v.setTranslationX(translationX);
                        v.setTranslationY(translationY);

                        // 下一次按下位置
                        downX = (int) event.getRawX();
                        downY = (int) event.getRawY();
                        break;
                    case MotionEvent.ACTION_UP:
                        //歸位

                               v.setTranslationX(0);
                                v.setTranslationY(0);

                        break;
                }

                return true;
            }
        });

第二種 歸位動畫實現：

                    case MotionEvent.ACTION_UP:

                        isMoving=true;

                        final int avgX= (int) Math.abs(v.getTranslationX()/10)==0 ?  1 : (int)Math.abs(v.getTranslationX()/10);
                        final int avgY= (int) Math.abs(v.getTranslationY()/10)==0 ?  1 : (int)Math.abs(v.getTranslationY()/10);

                        new Thread(new Runnable() {
                            @Override
                            public void run() {

                                while (isMoving){

                                    Message msg=new Message();
                                    msg.what=MOVING_VIEW_WHAT;
                                    msg.obj=v;
                                    msg.arg1=avgX;
                                    msg.arg2=avgY;

                                    countDownHandler.sendMessage(msg);

                                    try {
                                        Thread.sleep(20);
                                    } catch (InterruptedException e) {
                                        e.printStackTrace();
                                    }
                                }

                            }
                        }).start();

    private boolean isMoving;
    private Handler countDownHandler =new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);

            if(MOVING_VIEW_WHAT==msg.what){

                View view=((View)msg.obj);
                int avgX=msg.arg1;
                int avgY=msg.arg2;

                float tX=0;
                if(view.getTranslationX()!=0){
                   tX=view.getTranslationX()>0 ? ((view.getTranslationX()-avgX)<0 ? 0 : view.getTranslationX()-avgX)  : ((view.getTranslationX()+avgX)>0 ? 0 : view.getTranslationX()+avgX) ;
                }

                float tY=0;
                if(view.getTranslationY()!=0){
                      tY=view.getTranslationY()>0 ? ((view.getTranslationY()-avgY)<0 ? 0 : view.getTranslationY()-avgY) : ((view.getTranslationY()+avgY)>0 ? 0 : view.getTranslationY()+avgY) ;
                }

                view.setTranslationX(tX);
                view.setTranslationY(tY);


                isMoving= (tX!=0 || tY!=0);
                LogTools.i(TAG,"MOVING_VIEW_WHAT==tX=="+tX+",tY=="+tY+",avgX="+avgX+",avgY="+avgY+",isMoving="+isMoving);

            }
        }
    };

如需第一種歸位動畫，請參考第二種歸位動畫實現方法，實現思路一致的