(转)Android很有用的代码片段

1：查看是否有存储卡插入

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1. String status=Environment.getExternalStorageState();  
2. if(status.equals(Enviroment.MEDIA_MOUNTED))  
3. {  
4.    说明有SD卡插入  
5. }  

2：让某个Activity透明

OnCreate中不设Layout this.setTheme(R.style.Theme_Transparent);
以下是Theme_Transparent的定义（注意transparent_bg是一副透明的图片）


3：在屏幕元素中设置句柄

使用Activity.findViewById来取得屏幕上的元素的句柄. 使用该句柄您可以设置或获取任何该对象外露的值.

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1. TextView msgTextView = (TextView)findViewById(R.id.msg);  
2.    msgTextView.setText(R.string.push_me);   

4：发送短信

          

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1. String body=”this is mms demo”;  
2.           Intent mmsintent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(”smsto”, number, null));  
3.           mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_BODY, body);  
4.           mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_COMPOSE_MODE, true);  
5.           mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_EXIT_ON_SENT, true);  
6.            startActivity(mmsintent);  

5：发送彩信

           

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1. StringBuilder sb = new StringBuilder();  
2.             sb.append(”file://”);  
3.             sb.append(fd.getAbsoluteFile());  
4.             Intent intent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(”mmsto”, number, null));  
5.             // Below extra datas are all optional.  
6.             intent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_SUBJECT, subject);  
7.             intent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_BODY, body);  
8.             intent.putExtra(Messaging.KEY_ACTION_SENDTO_CONTENT_URI, sb.toString());  
9.             intent.putExtra(Messaging.KEY_ACTION_SENDTO_COMPOSE_MODE, composeMode);  
10.             intent.putExtra(Messaging.KEY_ACTION_SENDTO_EXIT_ON_SENT, exitOnSent);  
11.             startActivity(intent)  

6：发送Mail

         

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1. mime = “img/jpg”;  
2.             shareIntent.setDataAndType(Uri.fromFile(fd), mime);  
3.             shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(fd));  
4.             shareIntent.putExtra(Intent.EXTRA_SUBJECT, subject);  
5.             shareIntent.putExtra(Intent.EXTRA_TEXT, body);  

7：注册一个BroadcastReceiver

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1. registerReceiver(mMasterResetReciever, new IntentFilter(”oms.action.MASTERRESET”));  
2. private BroadcastReceiver mMasterResetReciever = new BroadcastReceiver() {  
3.         public void onReceive(Context context, Intent intent){  
4.             String action = intent.getAction();  
5.             if(”oms.action.MASTERRESET”.equals(action)){  
6.                 RecoverDefaultConfig();  
7.             }  
8.         }  
9.     }  

8：定义ContentObserver，监听某个数据表

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1. private ContentObserver mDownloadsObserver = new DownloadsChangeObserver(Downloads.CONTENT_URI);  
2. private class DownloadsChangeObserver extends ContentObserver {  
3.         public DownloadsChangeObserver(Uri uri) {  
4.             super(new Handler());  
5.         }  
6.         @Override  
7.         public void onChange(boolean selfChange) {｝    
8.         }  

  
9：获得 手机UA

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1. public String getUserAgent()  
2.     {  
3.            String user_agent = ProductProperties.get(ProductProperties.USER_AGENT_KEY, null);  
4.             return user_agent;  
5.     }  

10：清空手机上Cookie

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1. CookieSyncManager.createInstance(getApplicationContext());  
2.         CookieManager.getInstance().removeAllCookie();  

11：建立GPRS连接

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1. //Dial the GPRS link.  
2.    private boolean openDataConnection() {  
3.        // Set up data connection.  
4.        DataConnection conn = DataConnection.getInstance();       
5.            if (connectMode == 0) {  
6.                ret = conn.openConnection(mContext, “cmwap”, “cmwap”, “cmwap”);  
7.            } else {  
8.                ret = conn.openConnection(mContext, “cmnet”, “”, “”);  
9.            }  
10.    }  

12：PreferenceActivity 用法

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1. public class Setting extends PreferenceActivity  
2. ｛  
3.     public void onCreate(Bundle savedInstanceState) {  
4.         super.onCreate(savedInstanceState);  
5.         addPreferencesFromResource(R.xml.settings)；  
6.     }  
7. ｝  
8. Setting.xml:  
9.             android:key=”seting2″  
10.             android:title=”@string/seting2″  
11.             android:summary=”@string/seting2″/>  
12.             android:key=”seting1″  
13.             android:title=”@string/seting1″  
14.             android:summaryOff=”@string/seting1summaryOff”  
15.             android:summaryOn=”@stringseting1summaryOff”/>  

13：通过HttpClient从指定server获取数据

            

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1. DefaultHttpClient httpClient = new DefaultHttpClient();  
2.             HttpGet method = new HttpGet(“http://www.baidu.com/1.html”);  
3.             HttpResponse resp;  
4.             Reader reader = null;  
5.             try {  
6.                 // AllClientPNames.TIMEOUT  
7.                 HttpParams params = new BasicHttpParams();  
8.                 params.setIntParameter(AllClientPNames.CONNECTION_TIMEOUT, 10000);  
9.                 httpClient.setParams(params);  
10.                 resp = httpClient.execute(method);  
11.                 int status = resp.getStatusLine().getStatusCode();  
12.                 if (status != HttpStatus.SC_OK) return false;  
13.                 // HttpStatus.SC_OK;  
14.                 return true;  
15.             } catch (ClientProtocolException e) {  
16.                 // TODO Auto-generated catch block  
17.                 e.printStackTrace();  
18.             } catch (IOException e) {  
19.                 // TODO Auto-generated catch block  
20.                 e.printStackTrace();  
21.             } finally {  
22.                 if (reader != null) try {  
23.                     reader.close();  
24.                 } catch (IOException e) {  
25.                     // TODO Auto-generated catch block  
26.                     e.printStackTrace();  
27.                 }  
28.             }  

转自：http://blog.csdn.net/aomandeshangxiao/article/details/6603374