Android控件拖动的实现
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转自:http://blog.csdn.net/wangjia55/article/details/7458620,还可以参考如下网址了解getx
等方法区别:http://blog.csdn.net/jason0539/article/details/42743531,写的实在太好,所以就转载了,感谢这些前辈:
Android控件拖动的实现
分类:
这个也是从网上得到的代码,例子比较简单,但是如果有需要此功能的,这个例子可以提供很多提示,首先,给个截图
然后获取控件一开始的位置,然后在ACTION_MOVIE中:
getLeft()方法得到的是控件左边坐标距离父控件原点(左上角,坐标(0,0))的y轴距离,getRight()是控件右边距离父控件原点的y轴距离,同理,getTop和getButtom是距离的x轴距离。这里的判断是为了是控件不超出屏幕以外,即:到达边界以后,不能再移动。
上述方法没有试验成功,刚界面有更新,拖动的控件会重新恢复到原来的位置,还是使用layoutparams参数,如下:
这个是拖动以后的效果,一个imageview和一个button控件,提供两份代码下载吧,一份是只有一个Button的,另一份就是像上图,就是多了一个imagview!先看下代码吧,比较简单:
- public class DraftTest extends Activity implements OnTouchListener{
- /** Called when the activity is first created. */
- int screenWidth;
- int screenHeight;
- int lastX;
- int lastY;
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- DisplayMetrics dm = getResources().getDisplayMetrics();
- screenWidth = dm.widthPixels;
- screenHeight = dm.heightPixels - 50;
- Button button=(Button)findViewById(R.id.btn);
- ImageView imageView=(ImageView)findViewById(R.id.btn2);
- imageView.setOnTouchListener(this);
- button.setOnTouchListener(this);
- }
- @Override
- public boolean onTouch(View v, MotionEvent event) {
- // TODO Auto-generated method stub
- int action=event.getAction();
- Log.i("@@@@@@", "Touch:"+action);
- //Toast.makeText(DraftTest.this, "λ�ã�"+x+","+y, Toast.LENGTH_SHORT).show();
- switch(action){
- case MotionEvent.ACTION_DOWN:
- lastX = (int) event.getRawX();
- lastY = (int) event.getRawY();
- break;
- /**
- * layout(l,t,r,b)
- * l Left position, relative to parent
- t Top position, relative to parent
- r Right position, relative to parent
- b Bottom position, relative to parent
- * */
- case MotionEvent.ACTION_MOVE:
- int dx =(int)event.getRawX() - lastX;
- int dy =(int)event.getRawY() - lastY;
- int left = v.getLeft() + dx;
- int top = v.getTop() + dy;
- int right = v.getRight() + dx;
- int bottom = v.getBottom() + dy;
- if(left < 0){
- left = 0;
- right = left + v.getWidth();
- }
- if(right > screenWidth){
- right = screenWidth;
- left = right - v.getWidth();
- }
- if(top < 0){
- top = 0;
- bottom = top + v.getHeight();
- }
- if(bottom > screenHeight){
- bottom = screenHeight;
- top = bottom - v.getHeight();
- }
- v.layout(left, top, right, bottom);
- Log.i("@@@@@@", "position��" + left +", " + top + ", " + right + ", " + bottom);
- lastX = (int) event.getRawX();
- lastY = (int) event.getRawY();
- break;
- case MotionEvent.ACTION_UP:
- break;
- }
- return false;
- }
- }
- case MotionEvent.ACTION_DOWN:
- lastX = (int) event.getRawX();
- lastY = (int) event.getRawY();
- break;
然后获取控件一开始的位置,然后在ACTION_MOVIE中:
- int dx =(int)event.getRawX() - lastX;
- int dy =(int)event.getRawY() - lastY;
- int left = v.getLeft() + dx;
- int top = v.getTop() + dy;
- int right = v.getRight() + dx;
- int bottom = v.getBottom() + dy;
- if(left < 0){
- left = 0;
- right = left + v.getWidth();
- }
- if(right > screenWidth){
- right = screenWidth;
- left = right - v.getWidth();
- }
- if(top < 0){
- top = 0;
- bottom = top + v.getHeight();
- }
- if(bottom > screenHeight){
- bottom = screenHeight;
- top = bottom - v.getHeight();
- }
- v.layout(left, top, right, bottom);
- Log.i("@@@@@@", "position��" + left +", " + top + ", " + right + ", " + bottom);
- lastX = (int) event.getRawX();
- lastY = (int) event.getRawY();
getLeft()方法得到的是控件左边坐标距离父控件原点(左上角,坐标(0,0))的y轴距离,getRight()是控件右边距离父控件原点的y轴距离,同理,getTop和getButtom是距离的x轴距离。
- if(left < 0){
- left = 0;
- right = left + v.getWidth();
- }
- if(right > screenWidth){
- right = screenWidth;
- left = right - v.getWidth();
- }
- if(top < 0){
- top = 0;
- bottom = top + v.getHeight();
- }
- if(bottom > screenHeight){
- bottom = screenHeight;
- top = bottom - v.getHeight();
- }
- v.layout(left, top, right, bottom);
设置View的位置。
有一点忘记说了,就是像ImageView和TextView这些控件,要想实现拖动,要在xml文件中设置它的clickable为true。
- android:clickable="true"
就这样,这些就是这个demo的全部内容。
最后,是代码的下载地址:
http://download.csdn.net/detail/aomandeshangxiao/4187376,
http://download.csdn.net/detail/aomandeshangxiao/4189910
========================分割线2016年4月19日10:12:02================================================
当界面如果有切换、或者刷新的动作之后,发现所有拖动的控件,都会恢复到原来的位置,应该是父类执行了onlayout方法,恢复到默认的位置了,需要重新复写父类的方法,如下:
这个更简单,在刷新子控件位置的时候,去遍历一下,找到DraggableFloatingButton,如果left不为-1则说明之前移动过了,子控件再自己调次layout用自己记录的上次移动后的坐标,即可保证位置在父布局刷新的时候不受影响
[code] @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); for (int i = 0; i < getChildCount(); i++) { if (getChildAt(i) instanceof DraggableFloatingButton) { // 为了防止浮动按钮恢复原位,布局子控件位置时使用上次记录的位置 DraggableFloatingButton child = (DraggableFloatingButton) getChildAt(i); if (child.getLastLeft() != -1) { child.layout(child.getLastLeft(), child.getLastTop(), child.getLastRight(), child.getLastBottom()); } break; } } }父类重写的代码如下:
package net.loonggg.viewgroup;import android.content.Context;import android.util.AttributeSet;import android.view.View;import android.view.ViewGroup;public class MyViewGroup extends ViewGroup {public MyViewGroup(Context context) {super(context);}public MyViewGroup(Context context, AttributeSet attrs) {super(context, attrs);}public MyViewGroup(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);}/** * 计算控件的大小 */@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);int measureWidth = measureWidth(widthMeasureSpec);int measureHeight = measureHeight(heightMeasureSpec);// 计算自定义的ViewGroup中所有子控件的大小measureChildren(widthMeasureSpec, heightMeasureSpec);// 设置自定义的控件MyViewGroup的大小setMeasuredDimension(measureWidth, measureHeight);}private int measureWidth(int pWidthMeasureSpec) {int result = 0;int widthMode = MeasureSpec.getMode(pWidthMeasureSpec);// 得到模式int widthSize = MeasureSpec.getSize(pWidthMeasureSpec);// 得到尺寸switch (widthMode) {/** * mode共有三种情况,取值分别为MeasureSpec.UNSPECIFIED, MeasureSpec.EXACTLY, * MeasureSpec.AT_MOST。 * * * MeasureSpec.EXACTLY是精确尺寸, * 当我们将控件的layout_width或layout_height指定为具体数值时如andorid * :layout_width="50dip",或者为FILL_PARENT是,都是控件大小已经确定的情况,都是精确尺寸。 * * * MeasureSpec.AT_MOST是最大尺寸, * 当控件的layout_width或layout_height指定为WRAP_CONTENT时 * ,控件大小一般随着控件的子空间或内容进行变化,此时控件尺寸只要不超过父控件允许的最大尺寸即可 * 。因此,此时的mode是AT_MOST,size给出了父控件允许的最大尺寸。 * * * MeasureSpec.UNSPECIFIED是未指定尺寸,这种情况不多,一般都是父控件是AdapterView, * 通过measure方法传入的模式。 */case MeasureSpec.AT_MOST:case MeasureSpec.EXACTLY:result = widthSize;break;}return result;}private int measureHeight(int pHeightMeasureSpec) {int result = 0;int heightMode = MeasureSpec.getMode(pHeightMeasureSpec);int heightSize = MeasureSpec.getSize(pHeightMeasureSpec);switch (heightMode) {case MeasureSpec.AT_MOST:case MeasureSpec.EXACTLY:result = heightSize;break;}return result;}/** * 覆写onLayout,其目的是为了指定视图的显示位置,方法执行的前后顺序是在onMeasure之后,因为视图肯定是只有知道大小的情况下, * 才能确定怎么摆放 */@Overrideprotected void onLayout(boolean changed, int l, int t, int r, int b) {// 记录总高度int mTotalHeight = 0;// 遍历所有子视图int childCount = getChildCount();for (int i = 0; i < childCount; i++) {View childView = getChildAt(i);// 获取在onMeasure中计算的视图尺寸int measureHeight = childView.getMeasuredHeight();int measuredWidth = childView.getMeasuredWidth();childView.layout(l, mTotalHeight, measuredWidth, mTotalHeight+ measureHeight);mTotalHeight += measureHeight;}}}//==============================分割线,2016年4月25日13:59:05=================================
上述方法没有试验成功,刚界面有更新,拖动的控件会重新恢复到原来的位置,还是使用layoutparams参数,如下:
/** * 监听左上方悬浮的控件 */@Overridepublic boolean onTouch(View v, MotionEvent event) {if (DocCaptain.getInstance().isIfOrderLayout()) {webviewWidth = DocCaptain.getInstance().getWebviewWidthTrade();webviewHeight = DocCaptain.getInstance().getWebviewHeightTrade();}int action = event.getAction();switch (action) {case MotionEvent.ACTION_DOWN:lastX = (int) event.getRawX();lastY = (int) event.getRawY();break;case MotionEvent.ACTION_UP:break;case MotionEvent.ACTION_POINTER_DOWN:break;case MotionEvent.ACTION_POINTER_UP:break;case MotionEvent.ACTION_MOVE:int dx = (int) event.getRawX() - lastX;int dy = (int) event.getRawY() - lastY;int left = v.getLeft() + dx;int top = v.getTop() + dy;int right = v.getRight() + dx;int bottom = v.getBottom() + dy;if (left < 0) {left = 0;right = left + v.getWidth();}if (right > webviewWidth) {right = webviewWidth;left = right - v.getWidth();}if (top < 0) {top = 0;bottom = top + v.getHeight();}if (bottom > webviewHeight) {bottom = webviewHeight;top = bottom - v.getHeight();}RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) v.getLayoutParams();layoutParams.leftMargin = left;layoutParams.topMargin = top;layoutParams.rightMargin = right;layoutParams.bottomMargin = bottom;v.setLayoutParams(layoutParams);//// DocCaptain.getInstance().setSuspendLeft(left);// DocCaptain.getInstance().setSuspendTop(top);// DocCaptain.getInstance().setSuspendRight(right);// DocCaptain.getInstance().setSuspendBottom(bottom);// v.layout(left, top, right, bottom);lastX = (int) event.getRawX();lastY = (int) event.getRawY();break;}v.invalidate();return true;}
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- Android控件拖动的实现
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