来源: 互联网  发布时间: 2014-02-18

HttpClient依据系统配置设置代理

import org.apache.http.HttpHost;
import org.apache.http.client.HttpClient;
import org.apache.http.client.params.HttpClientParams;
import org.apache.http.conn.params.ConnRoutePNames;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;

import android.content.Context;
import android.net.Proxy;
import android.text.TextUtils;
import android.util.Log;

public final class HttpClientFactory {
	private static final String TAG = HttpClientFactory.class.getSimpleName();
	
	private static final int BUFFER_SIZE = 8192;
	private static final String USER_AGENT = "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 GTB6 (.NET CLR 3.5.30729)";
	private static final int CONN_TIME_OUT = 20 * 1000;
	private static final int READ_TIME_OUT = 20 * 1000;

	private HttpClientFactory() {
		super();
		// TODO Auto-generated constructor stub
	}
	
	public static HttpClient createHttpClient(Context context) {
		
		// 创建 HttpParams 以用来设置 HTTP 参数（这一部分不是必需的）
		HttpParams httpParams = new BasicHttpParams();

		// 设置连接超时和 Socket 超时，以及 Socket 缓存大小
		HttpConnectionParams.setConnectionTimeout(httpParams, CONN_TIME_OUT);
		HttpConnectionParams.setSoTimeout(httpParams, READ_TIME_OUT);
		HttpConnectionParams.setSocketBufferSize(httpParams, BUFFER_SIZE);

		// 设置重定向，缺省为 true
		HttpClientParams.setRedirecting(httpParams, true);
		
		// 检测代理设置
		String proxyHost = Proxy.getHost(context);
		int proxyPort = Proxy.getPort(context);
		
		Log.d(TAG, "[createHttpClient] proxyHost = " + proxyHost);
		Log.d(TAG, "[createHttpClient] proxyPort = " + proxyPort);
		
		boolean isWifiConnected = Utils.isWifiConnected(context);
		boolean isMobileConnected = Utils.isMobileConnected(context);
		
		Log.d(TAG, "[createHttpClient] isWifiConnected = " + isWifiConnected);
		Log.d(TAG, "[createHttpClient] isMobileConnected = " + isMobileConnected);
		
		if (!isWifiConnected && !TextUtils.isEmpty(proxyHost)) {
			HttpHost proxy = new HttpHost(proxyHost, proxyPort);
	        Log.d(TAG, "Set proxy: host: " + proxyHost + " port:" + proxyPort);
	        httpParams.setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);
		}

		// 设置 user agent
		String userAgent = USER_AGENT;
		HttpProtocolParams.setUserAgent(httpParams, userAgent);

		HttpClient httpClient = new DefaultHttpClient(httpParams);
		
		return httpClient;
	}
}

 

    

    来源: 互联网  发布时间: 2014-02-18

service Notification Thread的组合拳
碰到一个需求，就是隔一段时间调用webservice接口，如果有信息就提示有新消息。
虽然就一句话，但是想做好还真不太容易，昨天写好的demo今天调了一天，终于差不多了。
上代码
起始的Activity

new Thread(new Runnable(){

		public void run() {
			while(flag){
				try {
					startService(new Intent(Home.this,MyService.class));
					Thread.sleep(1000*10);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
		}			
	}).start();

Myservice类中

public void onStart(Intent intent, int startId) {
		// TODO Auto-generated method stub
		super.onStart(intent, startId);
		mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
....

}
@Override
public void onDestroy() {
	mNM.cancelAll();
	super.onDestroy();
}


 private void showNotification() {
	       
	        Notification notification = new Notification(R.drawable.newmessage, text,
	                System.currentTimeMillis());
	        notification.flags  = Notification.FLAG_AUTO_CANCEL;
	        PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
	                new Intent(this, nn.class), 0);
	        notification.setLatestEventInfo(this, getText(R.string.),
	                       text, contentIntent);
	        mNM.notify(R.string.XX, notification);
	       
	    }
	

Service类中的Handler中根据具体情况 决定是否调用showNotification()
退出应用的时候要清除掉Notification  Destory()中的mNM.cancelAll() 就清空了。

在调用完stopService()后别忘了关掉flag开关，OK了

    

    来源: 互联网  发布时间: 2014-02-18

拿到能打开指定类型文件的应用程序

Intent it = new Intent();
it.setType("image/*")
List<ResolveInfo> ra = this.getPackageManager().queryIntentActivities(it,0);  

 for(int i=0;i<ra.size();i++){  
    ActivityInfo ai = ra.get(i).activityInfo;  
    Drawable icon = ai.loadIcon(this.getPackageManager());   //图标
    String label = ai.loadLabel(this.getPackageManager()).toString();  //名称 
    ComponentName c = new ComponentName(ai.applicationInfo.packageName, ai.name);   //组件名，可以通过startActivity()打开此应用
 }

如果你要打开其他的媒体资源：video or audio
指定相应的Type即可！