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在我们用Android开发过程中,会碰到Activity在切换到后台或布局从横屏LANDSCAPE切换到PORTRAIT,会重新切换Activity会触发一次onCreate方法。在Android开发中这种情况视可以避免的,我们可以在androidmanifest.xml中的activit元素加入这个属性android:configChanges="orientation|keyboardHidden" 就能有效避免oncreat方法的重复加载, androidmanifest.xml内容如下:红色字体为添加部分<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.demo"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".DemoGPS"
android:configChanges="orientation|keyboardHidden"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<uses-library android:name="com.google.android.maps" /> </application>
<uses-sdk android:minSdkVersion="7" /> <uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
</manifest> 同时在Activity的Java文件中重载onConfigurationChanged(Configuration newConfig)这个方法,这样就不会在布局切换或窗口切换时重载等方法。代码如下: @Override
public void onConfigurationChanged(Configuration newConfig)
{
super.onConfigurationChanged(newConfig);
if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE)
{
//land
}
else if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT)
{
//port
}
}本文来自CSDN博客,转载请标明出处:http://blog.csdn.net/ocean20/archive/2010/10/31/5977615.aspx
String system = (String) (System.getProperty("os.name")).toLowerCase();
Log.d("eairflux", "system----------------" + system);
String pingCommand = "";
if (system.indexOf("win") != -1) {
pingCommand = "ping " + host + " -l " + leng + " -c "
+ count + " -i " + interval_data + " -w "
+ wait;//" -t " + ping.getReExeTimes() + " -n "+ ping.getReExeTimes() +
} else if (system.indexOf("linux") != -1) {
pingCommand = "ping " + host + " -l " + leng + " -c "
+ count + " -i " + interval_data + " -w "
+ wait;
} else {
pingCommand = "ping " + host + " -l " + leng + " -c "
+ count + " -i " + interval_data + " -w "
+ wait;
}
Log.d("eairflux", "pingCommand--------------------" + pingCommand);
int minTime = Integer.MAX_VALUE, curTime;
try {
Process process; process = Runtime.getRuntime().exec("ping " + host);
Log.d("eairflux", "process--------------------" + process);
BufferedReader in = new BufferedReader(new InputStreamReader(
process.getInputStream()));
String line="";
int count = 10, index;
// 最多只读10行
Log.d("eairflux", "line--------------------" + line);
if(in.readLine()==null||in.readLine().equals(""))
{
return 0;
}
while (!((line = in.readLine()).equals("")) && count-- != 0) {
Log.d("eairflux", "in.readLine()--------------------" + in.readLine());
line = line.toLowerCase();
Log.d("eairflux", "line.toLowerCase()--------------------" + line.toLowerCase());
if ((index = line.indexOf("time")) != -1) {
Log.d("eairflux", "buf--------------------" + line.getBytes());
byte[] buf = line.getBytes();
int start = 0, end = buf.length, i, j;
for (i = index + 4; i < buf.length; i++) {
if (Character.isDigit((char) buf[i])) {
start = i;
Log.d("eairflux", "start------------" + start);
break;
}
}
if (i == buf.length){
Log.d("eairflux", "buf.length------------" + buf.length);
continue;
}
for (j = start; j < buf.length; j++) {
if (Character.isLetter((char) buf[j])) {
end = j;
Log.d("eairflux", "end------------" + end);
break;
}
}
curTime = Integer.parseInt(new String(buf, start, end
- start));
if (curTime < minTime) {
Log.d("eairflux", "minTime------------" + minTime);
Log.d("eairflux", "curTime------------" + curTime);
minTime = curTime;
}
}
}
} catch (NumberFormatException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return minTime;
}