Android中dp和px之间进行转换

import android.content.Context; 

public class DensityUtil { 

/** 

* 根据手机的分辨率从 dp 的单位 转成为 px(像素) 

*/ 

public static int dip2px(Context context, float dpValue) { 

final float scale = context.getResources().getDisplayMetrics().density; 

return (int) (dpValue * scale + 0.5f); 

} 

/** 

* 根据手机的分辨率从 px(像素) 的单位 转成为 dp 

*/ 

public static int px2dip(Context context, float pxValue) { 

final float scale = context.getResources().getDisplayMetrics().density; 

return (int) (pxValue / scale + 0.5f); 

} 

}

url:http://www.111cn.net/nokia/N97/

public class ViewFlipperActivity extends Activity implements OnGestureListener { 

private static final int FLING_MIN_DISTANCE = 100; 

private ViewFlipper flipper; 

private GestureDetector detector; 

@Override 

protected void onCreate(Bundle savedInstanceState) { 

super.onCreate(savedInstanceState); 

setContentView(R.layout.viewflipper); 

// 注册一个GestureDetector 

detector = new GestureDetector(this); 

flipper = (ViewFlipper) findViewById(R.id.ViewFlipper); 

ImageView image1 = new ImageView(this); 

image1.setBackgroundResource(R.drawable.image1); 

// 增加第一个view 

flipper.addView(image1); 

ImageView image2 = new ImageView(this); 

image2.setBackgroundResource(R.drawable.image2); 

// 增加第二个view 

flipper.addView(image2); 

} 

@Override 

public boolean onTouchEvent(MotionEvent event) { 

// 将触屏事件交给手势识别类处理 

return this.detector.onTouchEvent(event); 

} 

@Override 

public boolean onDown(MotionEvent e) { 

return false; 

} 

@Override 

public void onShowPress(MotionEvent e) { 

} 

@Override 

public boolean onSingleTapUp(MotionEvent e) { 

return false; 

} 

@Override 

public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, 

float distanceY) { 

return false; 

} 

@Override 

public void onLongPress(MotionEvent e) { 

} 

@Override 

public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, 

float velocityY) { 

if (e1.getX() - e2.getX() > FLING_MIN_DISTANCE) { 

//设置View进入和退出的动画效果 

this.flipper.setInAnimation(AnimationUtils.loadAnimation(this, 

R.anim.left_in)); 

this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this, 

R.anim.left_out)); 

this.flipper.showNext(); 

return true; 

} 

if (e1.getX() - e2.getX() < -FLING_MIN_DISTANCE) { 

this.flipper.setInAnimation(AnimationUtils.loadAnimation(this, 

R.anim.right_in)); 

this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this, 

R.anim.right_out)); 

this.flipper.showPrevious(); 

return true; 

} 

return false; 

} 

} 

url: http://www.111cn.net/help/zt/21705.html

1 Activity.runOnUiThread(Runnable)

2 View.post(Runnable)

3 View.postDelayed(Runnable,long)

public class ShowExamActivity extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		// 1, 构造显示用渲染图
		XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer();
		// 2,进行显示
		XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
		// 2.1, 构建数据
		Random r = new Random();
		for (int i = 0; i < 2; i++) {
			XYSeries series = new XYSeries("test" + (i + 1));
			// 填充数据
			for (int k = 0; k < 10; k++) {
				// 填x,y值
				series.add(k, 20 + r.nextInt() % 100);
			}
			// 需要绘制的点放进dataset中
			dataset.addSeries(series);
		}
		// 3, 对点的绘制进行设置
		XYSeriesRenderer xyRenderer = new XYSeriesRenderer();
		// 3.1设置颜色
		xyRenderer.setColor(Color.BLUE);
		// 3.2设置点的样式
		xyRenderer.setPointStyle(PointStyle.SQUARE);
		// 3.3, 将要绘制的点添加到坐标绘制中
		renderer.addSeriesRenderer(xyRenderer);
		// 3.4,重复 1~3的步骤绘制第二个系列点
		xyRenderer = new XYSeriesRenderer();
		xyRenderer.setColor(Color.RED);
		xyRenderer.setPointStyle(PointStyle.CIRCLE);
		renderer.addSeriesRenderer(xyRenderer);

		// Intent intent = new LinChart().execute(this);
		Intent intent = ChartFactory
				.getLineChartIntent(this, dataset, renderer);
		startActivity(intent);

	}
}

<activity android:name="org.achartengine.GraphicalActivity" />

String ServerUrl="webservice地址";
 String soapAction="http://www.111cn.net/PhoneClient/GetVcardJson";

 String data="";

String requestData="<?xml version="1.0" encoding="utf-8"?>rn"+
"<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">rn"
  +"<soap:Header>rn"+
    "<AuthHeader xmlns="http://www.111cn.net/PhoneClient/">rn"+
     "<UserId>"+userID+"</UserId>rn"+
    "</AuthHeader>rn"+
  "</soap:Header>rn"+
  "<soap:Body>rn"+
    "<GetVcardJson xmlns="http://www.111cn.net/PhoneClient/">rn"+
      "<vcardUserNo>"+userNo+"</vcardUserNo>rn"+
    "</GetVcardJson>rn"+
  "</soap:Body>rn"+

"</soap:Envelope>";

try{
URL url =new URL(ServerUrl);
HttpURLConnection con=(HttpURLConnection)url.openConnection();
byte[] bytes=requestData.getBytes("utf-8");
con.setDoInput(true);
con.setDoOutput(true);
con.setUseCaches(false);
con.setRequestMethod("POST");
con.setRequestProperty("Content-Type", "text/xml;charset=utf-8");
con.setRequestProperty("SOAPAction",soapAction);
con.setRequestProperty("Content-Length",""+bytes.length);
OutputStream outStream=con.getOutputStream();
outStream.write(bytes);
outStream.flush();
outStream.close();
InputStream inStream=con.getInputStream();

data=parser(inStream);

private static String parser(InputStream in){
XmlPullParser parser=Xml.newPullParser();
String data="";
try{
int flag=0;
parser.setInput(in, "utf-8");
int evenType=parser.getEventType();
while(evenType!=XmlPullParser.END_DOCUMENT){
switch(evenType){
case XmlPullParser.START_DOCUMENT:break;
case XmlPullParser.START_TAG:
break;
case XmlPullParser.TEXT:
data=parser.getText();
break;
case XmlPullParser.END_TAG:break;
}
parser.next();
evenType=parser.getEventType();
}

}catch(XmlPullParserException e){
e.printStackTrace();
}catch(IOException e){
e.printStackTrace();
}
return data;
}