1.Android座標系 ,原點位於螢幕的左上角.

2.檢視座標系,原點位於父檢視的左上角.

3.

1. layout(左,上,右,下)

public class CustomView extends View {
    private int lastX;
    private int lastY;
    public CustomView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }
    public 
 
CustomView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    public CustomView(Context context) {
        super(context);
    }
    public boolean onTouchEvent(MotionEvent event) {
        //獲取到手指處的橫座標和縱座標
int x = (int) event.getX();
        int y = (int) event.getY();

        switch 
 
(event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                lastX = x;
                lastY = y;
                break;
            case MotionEvent.ACTION_MOVE:
                //計算移動的距離
int offsetX = x - lastX;
                int offsetY = y - lastY;
                //呼叫layout方法來重新放置它的位置
 
layout(getLeft()+offsetX, getTop()+offsetY,
                        getRight()+offsetX , getBottom()+offsetY);
                break;
        }
        return true;
    }
}

2. offsetLeftAndRight()和offsetTopAndBottom()

public class CustomView extends View {
    private int lastX;
    private int lastY;
    public CustomView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }
    public CustomView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    public CustomView(Context context) {
        super(context);
    }
    public boolean onTouchEvent(MotionEvent event) {
        //獲取到手指處的橫座標和縱座標
int x = (int) event.getX();
        int y = (int) event.getY();
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                lastX = x;
                lastY = y;
                break;
            case MotionEvent.ACTION_MOVE:
                //計算移動的距離
int offsetX = x - lastX;
                int offsetY = y - lastY;
                //對left和right進行偏移
offsetLeftAndRight(offsetX);
                //對top和bottom進行偏移
offsetTopAndBottom(offsetY);
                break;
        }
        return true;
    }
}

public class CustomView extends View {
    private int lastX;
    private int lastY;
    public CustomView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }
    public CustomView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    public CustomView(Context context) {
        super(context);
    }
    public boolean onTouchEvent(MotionEvent event) {
        //獲取到手指處的橫座標和縱座標
int x = (int) event.getX();
        int y = (int) event.getY();
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                lastX = x;
                lastY = y;
                break;
            case MotionEvent.ACTION_MOVE:
                //計算移動的距離
int offsetX = x - lastX;
                int offsetY = y - lastY;
                LinearLayout.LayoutParams layoutParams= (LinearLayout.LayoutParams) getLayoutParams();
                layoutParams.leftMargin = getLeft() + offsetX;
                layoutParams.topMargin = getTop() + offsetY;
                setLayoutParams(layoutParams);
                break;
        }
        return true;
    }
}

4.給view設定動畫

<1.

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromXDelta="0" android:toXDelta="300" android:duration="1000"/>
</set>

mCustomView.setAnimation(AnimationUtils.loadAnimation(this, R.anim.translate));

<2.屬性動畫

ObjectAnimator.ofFloat(mCustomView,"translationX",0,300).setDuration(1000).start();

5.scollTo與scollBy