弄了一个下午，终于搞出来了，PowerfulLayout
下面是一个功能强大的改造的例子：
可以实现以下需求：
1.两个手指进行缩放布局
2.所有子控件也随着缩放，
3.子控件该有的功能不能丢失（像button有可被点击的功能，缩放后不能丢失该功能）
相对上个例子，多了一个功能---
4.拖拽（平移）layout
运行效果图：http://pan.baidu.com/s/1sleoHXz
布局文件test.xml、超级简单的
<?xml version="1.0" encoding="utf-8"?>
<com.example.testbitmapscale.PowerfulLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<FrameLayout
android:background="@drawable/home_tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageButton
android:id="@+id/imageButton2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/selector_button1" />
</FrameLayout>
</com.example.testbitmapscale.PowerfulLayout>
java代码：
MainActivity也是超级简单
public class MainActivity extends ActionBarActivity {
private View view;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.test);
view = View.inflate(this, R.layout.test, null);
setContentView(view);
}
// @Override
// public boolean onTouchEvent(MotionEvent event) {
// if (event.getPointerCount() > 1) {
// // 多点触控
// // 返回给ScaleGestureDetector来处理
// return mScaleGestureDetector.onTouchEvent(event);
// } else {
// // 单点触控
// switch (event.getAction()) {
// case MotionEvent.ACTION_DOWN:
// downX = (int) event.getX();
// downY = (int) event.getY();
// newHeight = view.getLayoutParams().height;
// newWidth = view.getLayoutParams().width;
//// int widthMeasureSpec =
//// View.MeasureSpec.makeMeasureSpec(2000,View.MeasureSpec.AT_MOST);
////
//// int heightMeasureSpec
//// =View.MeasureSpec.makeMeasureSpec(2000,View.MeasureSpec.AT_MOST);
////
//// view.measure(widthMeasureSpec,heightMeasureSpec);
////
//// newHeight = view.getMeasuredHeight();
////
//// newWidth = view.getMeasuredWidth();
// break;
// case MotionEvent.ACTION_MOVE:
// long currentTimeMillis = System.currentTimeMillis();
// if (currentTimeMillis - lastMultiTouchTime > 200) {
// // 双指触控后要等待200毫秒才能执行单指触控的操作，避免双指触控后出现颤抖的情况
// int moveX = (int) event.getX();// 移动手指的时候手指的x
// int moveY = (int) event.getY();// 移动手指的时候手指的y
// int deltaX = (int) (moveX - downX);
// int deltaY = (int) (moveY - downY);
// int newLeft = left + deltaX;// view的新left
// int newTop = top + deltaY;// view的新top
// int newRight = right + deltaX;// view的新right
// int newBottom = bottom + deltaY;// view的新bottom
//// int newWidth = (int) (preScale * originalWidth);
//// int newHeight = (int) (preScale * originalHeight);
//// if (deltaX>(newWidth-originalHeight)/2||deltaY>(newHeight-originalHeight)/2) {
//// return false;
//// }
// // int newWidth = view.getWidth();
// // int newHeight = view.getHeight();
// System.out.println("newWidth:" + newWidth + "newHeight:"
// + newHeight);
//// System.out.println(preScale);
// if (newLeft < originalWidth - newWidth) {
// newLeft = originalWidth - newWidth;
// newRight = newLeft + newWidth;
// }
// // if (newTop < originalHeight - newHeight){
// // newTop = originalHeight - newHeight;
// // newBottom= newTop+newHeight;
// // }
// // if(newRight>originalWidth){
// // newRight=originalWidth;
// // newLeft=newRight-newWidth;
// // }
// // if(newBottom>originalHeight){
// // newBottom=originalHeight;
// // newTop=newBottom-newHeight;
// // }
// view.layout(newLeft, newTop, newRight, newBottom);// 重新摆放view的位置
// } else {
// return false;
// }
//
// break;
// case MotionEvent.ACTION_UP:
// // 更新位置信息
// left = view.getLeft();
// top = view.getTop();
// right = view.getRight();
// bottom = view.getBottom();
// break;
//
// default:
// break;
// }
// return true;// 代表消费了事件
// }
// }
}
PowerfulLayout.java:
public class PowerfulLayout extends FrameLayout {
// 屏幕宽高
private int screenHeight;
private int screenWidth;
private ViewDragHelper mDragHelper;
private long lastMultiTouchTime;// 记录双指缩放后的时间
private int originalWidth;// view宽度
private int originalHeight;// view高度
private ScaleGestureDetector mScaleGestureDetector = null;
// private View view;
private int downX;// 手指按下的x坐标值
private int downY;// 手指按下的y坐标值
private int left;// view的左坐标值
private int top;// view的上坐标值
private int right;// view的右坐标值
private int bottom;// view的下坐标值
private int newHeight;
private int newWidth;
private float scale;
private float preScale = 1;// 默认前一次缩放比例为1
public PowerfulLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
public PowerfulLayout(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public PowerfulLayout(Context context) {
super(context);
init(context);
}
private void init(Context context) {
mDragHelper = ViewDragHelper.create(this, callback);
mScaleGestureDetector = new ScaleGestureDetector(context,
new ScaleGestureListener());
// view.post(new Runnable() {
//
// @Override
// public void run() {
// left = view.getLeft();
// top = view.getTop();
// right = view.getRight();
// bottom = view.getBottom();
// originalWidth = view.getWidth();
// originalHeight = view.getHeight();
// }
// });
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
screenWidth = getMeasuredWidth();
screenHeight = getMeasuredHeight();
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
super.onInterceptTouchEvent(ev);
boolean b = mDragHelper.shouldInterceptTouchEvent(ev);// 由mDragHelper决定是否拦截事件，并传递给onTouchEvent
return b;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int pointerCount = event.getPointerCount(); // 获得多少点
if (pointerCount > 1) {// 多点触控，让mScaleGestureDetector处理触摸事件
return mScaleGestureDetector.onTouchEvent(event);
} else {
long currentTimeMillis = System.currentTimeMillis();
if (currentTimeMillis - lastMultiTouchTime > 200) {
// // 双指触控后要等待200毫秒才能执行单指触控的操作，避免双指触控后出现颤抖的情况
try {
mDragHelper.processTouchEvent(event);
} catch (Exception e) {
e.printStackTrace();
}
return true;
}
}
return false;
}
private ViewDragHelper.Callback callback = new ViewDragHelper.Callback() {
/**
* 用于判断是否捕获当前child的触摸事件
*
* @param child
* 当前触摸的子view
* @param pointerId
* @return true就捕获并解析；false不捕获
*/
@Override
public boolean tryCaptureView(View child, int pointerId) {
if (preScale > 1)
return true;
return false;
}
/**
* 控制水平方向上的位置
*/
@Override
public int clampViewPositionHorizontal(View child, int left, int dx) {
if (left < (screenWidth - screenWidth * preScale) / 2)
left = (int) (screenWidth - screenWidth * preScale) / 2;// 限制mainView可向左移动到的位置
if (left > (screenWidth * preScale - screenWidth) / 2)
left = (int) (screenWidth * preScale - screenWidth) / 2;// 限制mainView可向右移动到的位置
return left;
}
public int clampViewPositionVertical(View child, int top, int dy) {
if (top < (screenHeight - screenHeight * preScale) / 2) {
top = (int) (screenHeight - screenHeight * preScale) / 2;// 限制mainView可向上移动到的位置
}
if (top > (screenHeight * preScale - screenHeight) / 2) {
top = (int) (screenHeight * preScale - screenHeight) / 2;// 限制mainView可向上移动到的位置
}
return top;
}
};
public class ScaleGestureListener implements
ScaleGestureDetector.OnScaleGestureListener {
@Override
public boolean onScale(ScaleGestureDetector detector) {
float previousSpan = detector.getPreviousSpan();// 前一次双指间距
float currentSpan = detector.getCurrentSpan();// 本次双指间距
if (currentSpan < previousSpan) {
// 缩小
// scale = preScale-detector.getScaleFactor()/3;
scale = preScale - (previousSpan - currentSpan) / 1000;
} else {
// 放大
// scale = preScale+detector.getScaleFactor()/3;
scale = preScale + (currentSpan - previousSpan) / 1000;
}
// 缩放view
if (scale > 0.5) {
ViewHelper.setScaleX(PowerfulLayout.this, scale);// x方向上缩放
ViewHelper.setScaleY(PowerfulLayout.this, scale);// y方向上缩放
}
return false;
}
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
// 一定要返回true才会进入onScale()这个函数
return true;
}
@Override
public void onScaleEnd(ScaleGestureDetector detector) {
preScale = scale;// 记录本次缩放比例
lastMultiTouchTime = System.currentTimeMillis();
}
}
}
时间： 2024-10-13 22:56:52