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Android系统开发全攻略(二)

时间:06-08 来源:互联网 点击:

*/

private final static int MOVE_WIDTH=20;

private Button btnHandle;

private LinearLayout panelContainer;

private int mRightMargin=0;

private Context mContext;

private PanelClosedEvent panelClosedEvent=null;

private PanelOpenedEvent panelOpenedEvent=null;

/**

* otherView自动布局以适应Panel展开/收缩的空间变化

* @author GV

*

*/

public Panel(Context context,View otherView,int width,int height) {

super(context);

this.mContext=context;

//改变Panel附近组件的属性

LayoutParams otherLP=(LayoutParams) otherView.getLayoutParams();

otherLP.weight=1;//支持压挤

otherView.setLayoutParams(otherLP);

//设置Panel本身的属性

LayoutParams lp=new LayoutParams(width, height);

lp.rightMargin=-lp.width+HANDLE_WIDTH;//Panel的Container在屏幕不可视区域,Handle在可视区域

mRightMargin=Math.abs(lp.rightMargin);

this.setLayoutParams(lp);

this.setOrientation(LinearLayout.HORIZONTAL);

//设置Handle的属性

btnHandle=new Button(context);

btnHandle.setLayoutParams(new LayoutParams(HANDLE_WIDTH,height));

btnHandle.setOnClickListener(new OnClickListener(){

@Override

public void onClick(View arg0) {

LayoutParams lp = (LayoutParams) Panel.this.getLayoutParams();

if (lp.rightMargin 《 0)// CLOSE的状态

new AsynMove().execute(new Integer[] { MOVE_WIDTH });// 正数展开

else if (lp.rightMargin 》= 0)// OPEN的状态

new AsynMove().execute(new Integer[] { -MOVE_WIDTH });// 负数收缩

}

});

//btnHandle.setOnTouchListener(HandleTouchEvent);

this.addView(btnHandle);

//设置Container的属性

panelContainer=new LinearLayout(context);

panelContainer.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,

LayoutParams.FILL_PARENT));

this.addView(panelContainer);

}

/**
  * 定义收缩时的回调函数

* @param event

*/

public void setPanelClosedEvent(PanelClosedEvent event)

{

this.panelClosedEvent=event;

}

/**

* 定义展开时的回调函数

* @param event

*/

public void setPanelOpenedEvent(PanelOpenedEvent event)

{

this.panelOpenedEvent=event;

}

/**

* 把View放在Panel的Container

* @param v

*/

public void fillPanelContainer(View v)

{

panelContainer.addView(v);

}

/**

* 异步移动Panel

* @author hellogv

*/

class AsynMove extends AsyncTask《Integer, Integer, Void》 {

@Override

protected Void doInBackground(Integer.。. params) {

int times;

if (mRightMargin % Math.abs(params[0]) == 0)// 整除

times = mRightMargin / Math.abs(params[0]);

else

// 有余数

times = mRightMargin / Math.abs(params[0]) + 1;

for (int i = 0; i 《 times; i++) {

publishProgress(params);

try {

Thread.sleep(Math.abs(params[0]));

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

return null;

}

@Override

protected void onProgressUpdate(Integer.。. params) {

LayoutParams lp = (LayoutParams) Panel.this.getLayoutParams();

if (params[0] 《 0)

lp.rightMargin = Math.max(lp.rightMargin + params[0],

(-mRightMargin));

else

lp.rightMargin = Math.min(lp.rightMargin + params[0], 0);

if(lp.rightMargin==0 panelOpenedEvent!=null){//展开之后

panelOpenedEvent.onPanelOpened(Panel.this);//调用OPEN回调函数

}

else if(lp.rightMargin==-(mRightMargin) panelClosedEvent!=null){//收缩之后

panelClosedEvent.onPanelClosed(Panel.this);//调用CLOSE回调函数

}

Panel.this.setLayoutParams(lp);

}

}

}

《/SPAN》

《SPAN style=“FONT-family:Comic Sans MS;FONT-size:18px;”》public class Panel extends LinearLayout{

public interface PanelClosedEvent {

void onPanelClosed(View panel);

}

public interface PanelOpenedEvent {

void onPanelOpened(View panel);

}

/**Handle的宽度,与Panel等高*/

private final static int HANDLE_WIDTH=30;

/**每次自动展开/收缩的范围*/

private final static int MOVE_WIDTH=20;

private Button btnHandle;

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