由于在网上找到的教程中双指旋转需要通过获取手指落点相对于父控件的坐标点来计算，所以采用重写RelativeLayout的方法，如果有其他的方法不需要重写RelativeLayout，希望可以和我联系
MyRelativeLayout.java
/**
* Created by nan on 2017/5/27.
*/
public class MyRelativeLayout extends RelativeLayout {
private TextView mytextview;
private static LinearLayout textCustomLayout;
private float startx;// down事件发生时，手指相对于view左上角x轴的距离
private float starty;// down事件发生时，手指相对于view左上角y轴的距离
private float endx; // move事件发生时，手指相对于view左上角x轴的距离
private float endy; // move事件发生时，手指相对于view左上角y轴的距离
private float left; // DragTV左边缘相对于父控件的距离
private float top; // DragTV上边缘相对于父控件的距离
private int right; // DragTV右边缘相对于父控件的距离
private int bottom; // DragTV底边缘相对于父控件的距离
private float hor; // 触摸情况下，手指在x轴方向移动的距离
private float ver; // 触摸情况下，手指在y轴方向移动的距离
private float mfX, mfY, msX, msY;
private boolean isMove = true;
private float mAngle;
private int ptrID1 = INVALID_POINTER_ID, ptrID2 = INVALID_POINTER_ID;
private float oldDist = 0;
private float textSize = 0;
private float scale;
private static final int INVALID_POINTER_ID = -1;
private MotionEvent mEvent;
private boolean onefingure;
public MyRelativeLayout(Context context) {
super(context);
}
public MyRelativeLayout(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public MyRelativeLayout(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public textClick getTextClick() {
return mytextClick;
}
public void setTextClick(textClick mytextClick) {
this.mytextClick = mytextClick;
}
private textClick mytextClick;
@Override
public boolean onTouchEvent(MotionEvent event) {
mEvent = event;
mytextview = (TextView) findViewById(R.id.poemtext);
mytextview.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
mytextview = (TextView) v;
if (textSize == 0) {
textSize = mytextview.getTextSize();
}
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
onefingure = true;
//手指落点相对于TextView的坐标
startx = event.getX();
starty = event.getY();
Log.d("HHHH", "onTouch: ACTION_DOWM " + startx);
ptrID1 = event.getPointerId(event.getActionIndex());
break;
case MotionEvent.ACTION_POINTER_DOWN:
isMove = false;
onefingure = false;
ptrID2 = event.getPointerId(event.getActionIndex());
//手指落点相对于RelativeLayout的坐标
msX = mEvent.getX(event.findPointerIndex(ptrID2));
msY = mEvent.getY(event.findPointerIndex(ptrID2));
mfX = mEvent.getX(event.findPointerIndex(ptrID1));
mfY = mEvent.getY(event.findPointerIndex(ptrID1));
oldDist = spacing(event);
break;
case MotionEvent.ACTION_MOVE:
Log.d("HHHH", "onTouch: ACTION_MOVE ");
left = mytextview.getX();
top = mytextview.getY();
if (isMove) {
endx = event.getX();
endy = event.getY();
hor = (endx - startx);
ver = (endy - starty);
mytextview.setX(left + hor);
mytextview.setY(top + ver);
}
else {
//处理旋转模块
float nfX, nfY, nsX, nsY, test;
test = event.getX(event.findPointerIndex(ptrID1));
nsX = mEvent.getX(event.findPointerIndex(ptrID2));
nsY = mEvent.getY(event.findPointerIndex(ptrID2));
nfX = mEvent.getX(event.findPointerIndex(ptrID1));
nfY = mEvent.getY(event.findPointerIndex(ptrID1));
mAngle = angleBetweenLines(mfX, mfY, msX, msY, nfX, nfY, nsX, nsY);
mytextview.setRotation(mAngle);
//缩放
float newDist = spacing(event);
if (newDist > oldDist + 1) {
zoom(newDist / oldDist);
oldDist = newDist;
}
if (newDist < oldDist - 1) {
zoom(newDist / oldDist);
oldDist = newDist;
}
}
break;
case MotionEvent.ACTION_UP:
Log.d("HHHH", "onTouch: ACTION_UP");
if (onefingure) {
//监听事件，在MainActivity中实现，否则不能调用MainActivity中的对象
mytextClick.onTextClick();
}
break;
case MotionEvent.ACTION_POINTER_UP:
Log.d("HHHH", "onTouch: ACTION_POINTER_UP");
isMove = true;
break;
}
return true;
}
});
return true;
}
private float spacing(MotionEvent event) {
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return (float) Math.sqrt(x * x + y * y);
}
private void zoom(float f) {
mytextview.setTextSize(textSize *= f);
}
/**
* 计算刚开始触摸的两个点构成的直线和滑动过程中两个点构成直线的角度
*
* @param fX 初始点一号x坐标
* @param fY 初始点一号y坐标
* @param sX 初始点二号x坐标
* @param sY 初始点二号y坐标
* @param nfX 终点一号x坐标
* @param nfY 终点一号y坐标
* @param nsX 终点二号x坐标
* @param nsY 终点二号y坐标
* @return 构成的角度值
*/
private float angleBetweenLines(float fX, float fY, float sX, float sY, float nfX, float nfY, float nsX, float nsY) {
float angle1 = (float) Math.atan2((fY - sY), (fX - sX));
float angle2 = (float) Math.atan2((nfY - nsY), (nfX - nsX));
float angle = ((float) Math.toDegrees(angle1 - angle2)) % 360;
if (angle < -180.f) angle += 360.0f;
if (angle > 180.f) angle -= 360.0f;
return -angle;
}
public interface textClick {
void onTextClick();
}
}
如果想要监听其中TextView的点击事件，可以设置接口
public textClick getTextClick() {
return mytextClick;
}
public void setTextClick(textClick mytextClick) {
this.mytextClick = mytextClick;
}
private textClick mytextClick;
public interface textClick {
void onTextClick();
}
在MainActivity.java中实现如下
@Override
public void onTextClick() {
mPoemLayout.setVisibility(View.INVISIBLE);
textCustom();
textCustomLayout.setVisibility(View.VISIBLE);
Toast.makeText(this, "hahaha", Toast.LENGTH_LONG).show();
}
