Android编程14个很有用的代码片段.pdf

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1、 Android 编程 14 个很有用的代码片段 1：查看是否有存储卡插入 String status=Environment.getExternalStorageState();if(status.equals(Enviroment.MEDIA_MOUNTED)说明有 SD 卡插入 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.

2、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.TextView msgTextView=(TextView)findViewById(R.id.msg);msgTextView.setText(R.string.push_me);4:发送短信 String body=”this is mms demo”;Intent mmsintent=new Intent(Intent.ACTION_SENDTO,Uri.fromParts(”smsto”,number,null);mmsintent.putExtra(Messaging.KEY_ACTI

3、ON_SENDTO_MESSAGE_BODY,body);mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_COMPOSE_MODE,true);mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_EXIT_ON_SENT,true);startActivity(mmsintent);5:发送彩信 StringBuilder sb=new StringBuilder();sb.append(”file:/”);sb.append(fd.getAbsoluteFile();Intent intent=new I

4、ntent(Intent.ACTION_SENDTO,Uri.fromParts(”mmsto”,number,null);/Below extra datas are all optional.intent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_SUBJECT,subject);intent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_BODY,body);intent.putExtra(Messaging.KEY_ACTION_SENDTO_CONTENT_URI,sb.toString();

5、intent.putExtra(Messaging.KEY_ACTION_SENDTO_COMPOSE_MODE,composeMode);intent.putExtra(Messaging.KEY_ACTION_SENDTO_EXIT_ON_SENT,exitOnSent);startActivity(intent);6:显示 toast Toast.makeText(this._getApplicationContext(),R.string._item,Toast.LENGTH_SHORT).show();7：发送 Mail mime=“img/jpg”;shareIntent.setD

6、ataAndType(Uri.fromFile(fd),mime);shareIntent.putExtra(Intent.EXTRA_STREAM,Uri.fromFile(fd);shareIntent.putExtra(Intent.EXTRA_SUBJECT,subject);shareIntent.putExtra(Intent.EXTRA_TEXT,body);8:注册一个 BroadcastReceiver registerReceiver(mMasterResetReciever,new IntentFilter(”OMS.action.MASTERRESET”);privat

7、e BroadcastReceiver mMasterResetReciever=new BroadcastReceiver()public void onReceive(Context context,Intent intent)String action=intent.getAction();if(”oms.action.MASTERRESET”.equals(action)RecoverDefaultConfig();9:定义 ContentObserver，监听某个数据表 private ContentObserver mDownloadsObserver=new DownloadsC

8、hangeObserver(Downloads.CONTENT_URI);private class DownloadsChangeObserver extends ContentObserver public DownloadsChangeObserver(Uri uri)super(new Handler();Override public void onChange(boolean selfChange)10:获得 手机 UA public String getUserAgent()String user_agent=ProductProperties.get(ProductProper

9、ties.USER_AGENT_KEY,null);return user_agent;11：清空手机上 cookie CookieSyncManager.createInstance(getApplicationContext();CookieManager.getInstance().removeAllCookie();12：建立 GPRS 连接/Dial the GPRS link.private boolean openDataConnection()/Set up data connection.DataConnection conn=DataConnection.getInstan

10、ce();if(connectMode=0)ret=conn.openConnection(mContext,“cmwap”,“cmwap”,“cmwap”);else ret=conn.openConnection(mContext,“cmnet”,“”,“”);13：PreferenceActivity 用法 public class Setting extends PreferenceActivity public void onCreate(Bundle savedInstanceState)super.onCreate(savedInstanceState);addPreferenc

11、esFromResource(R.xml.settings)；Setting.xml:Android:key=”seting2 android:title=”string/seting2 android:summary=”string/seting2/android:key=”seting1 android:title=”string/seting1 android:summaryOff=”string/seting1summaryOff”android:summaryOn=”stringseting1summaryOff”/14:通过 HttpClient 从指定 server 获取数据 D

12、efaultHttpClient httpClient=new DefaultHttpClient();HttpGet method=new HttpGet(“http:/ resp;Reader reader=null;try /AllClientPNames.TIMEOUT HttpParams params=new BasicHttpParams();params.setIntParameter(AllClientPNames.CONNECTION_TIMEOUT,10000);httpClient.setParams(params);resp=httpClient.execute(me

13、thod);int status=resp.getStatusLine().getStatusCode();if(status!=HttpStatus.SC_OK)return false;/HttpStatus.SC_OK;return true;catch(ClientProtocolException e)/TODO Auto-generated catch block e.printStackTrace();catch(IOException e)/TODO Auto-generated catch block e.printStackTrace();finally if(reader!=null)try reader.close();catch(IOException e)/TODO Auto-generated catch block e.printStackTrace();