Android很有用的代码片段

1:查看是否有存储卡插入
[java]  view plain copy
  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.
[java]  view plain copy
  1. TextView msgTextView = (TextView)findViewById(R.id.msg);  
  2.    msgTextView.setText(R.string.push_me);   
4:发送短信

          
[java]  view plain copy
  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

           
[java]  view plain copy
  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

         
[java]  view plain copy
  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

[java]  view plain copy
  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


[java]  view plain copy
  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

[java]  view plain copy
  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

[java]  view plain copy
  1. CookieSyncManager.createInstance(getApplicationContext());  
  2.         CookieManager.getInstance().removeAllCookie();  
11:建立GPRS连接

[java]  view plain copy
  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

[java]  view plain copy
  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

            
[java]  view plain copy
  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 != nulltry {  
  23.                     reader.close();  
  24.                 } catch (IOException e) {  
  25.                     // TODO Auto-generated catch block  
  26.                     e.printStackTrace();  
  27.                 }  
  28.             }  

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