14个简单有用的android源码,适合初学者

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

在OnCreate 中不设Layout,然后this.setTheme(R.style.Theme_Transparent);

3：获取屏幕宽高

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1. DisplayMetrics dm = new DisplayMetrics();    
2. //获取窗口属性  
3. getWindowManager().getDefaultDisplay().getMetrics(dm);      
4. int screenWidth = dm.widthPixels;    
5. int screenHeight = dm.heightPixels;  

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);  

7：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);  

8: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.     };  

9: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.         }  

10: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.   
5. return user_agent;   
6.   
7. }  

11：清空手机上Cookie

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

12：建立GPRS 连接

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1. private boolean openDataConnection() {   
2.   
3. DataConnection conn = DataConnection.getInstance();  
4.   
5.  if (connectMode == 0) {   
6.   
7.   ret = conn.openConnection(mContext, “cmwap”, “cmwap”, “cmwap”);  
8.   
9.  } else {   
10.   
11.   ret = conn.openConnection(mContext, “cmnet”, “”, “”);   
12.   
13. }  
14.   
15. }  

13：PreferenceActivity 用法

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1. public class Setting extends PreferenceActivity｛  
2.   
3.  public void onCreate(Bundle savedInstanceState) {   
4.   
5.  super.onCreate(savedInstanceState);  
6.   
7.  addPreferencesFromResource(R.xml.settings)；  
8.   
9.  }  
10.   
11. ｝  

Setting.xml:

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1. android:key=”seting2″   
2.   
3. android:title=”@string/seting2″   
4.   
5. android:summary=”@string/seting2″/>   
6.   
7. android:key=”seting1″   
8.   
9. android:title=”@string/seting1″   
10.   
11. android:summaryOff=”@string/seting1summaryOff”   
12.   
13. android:summaryOn=”@stringseting1summaryOff”/>  

14:通过 HttpClient从指定server获取数据

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1.  DefaultHttpClient httpClient = new DefaultHttpClient();   
2.   
3. HttpGet method = new HttpGet(“http://www.baidu.com/1.html”);   
4.   
5. HttpResponse resp;   
6.   
7. Reader reader = null;   
8.   
9. try {   
10.   
11. // AllClientPNames.TIMEOUT   
12.   
13. HttpParams params = new BasicHttpParams();   
14.   
15. params.setIntParameter(AllClientPNames.CONNECTION_TIMEOUT, 10000);   
16.   
17. httpClient.setParams(params);  
18.   
19. resp = httpClient.execute(method);   
20.   
21. int status = resp.getStatusLine().getStatusCode();   
22.   
23. if (status != HttpStatus.SC_OK)  
24.   
25.  return false;  
26.   
27.  // HttpStatus.SC_OK;  
28.   
29.  return true;  
30.   
31.  } catch (ClientProtocolException e) {   
32.   
33. // TODO Auto-generated catch block   
34.   
35. e.printStackTrace();   
36.   
37. } catch (IOException e) {   
38.   
39. // TODO Auto-generated catch block e.printStackTrace();  
40.   
41.  } finally {   
42.   
43. if (reader != null)   
44.   
45. try {  
46.   
47.  reader.close();   
48.   
49. } catch (IOException e) {   
50.   
51. // TODO Auto-generated   
52.   
53. catch block e.printStackTrace();  
54.   
55.  }   
56.   
57. }