Android开发 常用代码片段

1、查看是否有存储卡插入

1	String status=Environment.getExternalStorageState();

2

3	if( status.equals ( Enviroment.MEDIA_MOUNTED ) )

4

{

5

说明有SD卡插入

6

}

2、让某个Activity透明

1	OnCreate中不设Layout

2

3	this.setTheme(R.style.Theme_Transparent);

4

5	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.

1	TextView msgTextView = (TextView)findViewById(R.id.msg);

2

3	msgTextView.setText(R.string.push_me);

4、发送短信

1	String body=”thisis mms demo”;

2

3	Intent mmsintent =newIntent(Intent.ACTION_SENDTO, Uri.fromParts(”smsto”, number,null));

4

5	mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_BODY, body);

6	mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_COMPOSE_MODE,true);

7	mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_EXIT_ON_SENT,true);

8

9	startActivity(mmsintent);

5、发送彩信

01	StringBuilder sb =newStringBuilder();

02

03	sb.append(”file://”);

04

05	sb.append(fd.getAbsoluteFile());

06

07	Intent intent =newIntent(Intent.ACTION_SENDTO, Uri.fromParts(”mmsto”, number,null));

08

09	// Below extra datas are all optional.

10	intent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_SUBJECT, subject);

11	intent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_BODY, body);

12	intent.putExtra(Messaging.KEY_ACTION_SENDTO_CONTENT_URI, sb.toString());

13	intent.putExtra(Messaging.KEY_ACTION_SENDTO_COMPOSE_MODE, composeMode);

14	intent.putExtra(Messaging.KEY_ACTION_SENDTO_EXIT_ON_SENT, exitOnSent);

15

16	startActivity(intent);

6、显示toast

1	Toast.makeText(this._getApplicationContext(), R.string._item, Toast.LENGTH_SHORT).show();

7、发送Mail

1	mime = “img/jpg”;

2

3	shareIntent.setDataAndType(Uri.fromFile(fd), mime);

4

5	shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(fd));

6

7	shareIntent.putExtra(Intent.EXTRA_SUBJECT, subject);

8

9	shareIntent.putExtra(Intent.EXTRA_TEXT, body);

8、注册一个BroadcastReceiver

01	registerReceiver(mMasterResetReciever,newIntentFilter(”OMS.action.MASTERRESET”));

02

03	privateBroadcastReceiver mMasterResetReciever =newBroadcastReceiver()

04

{

05	publicvoidonReceive(Context context, Intent intent)

06

{

07	String action = intent.getAction();

08

09	if(”oms.action.MASTERRESET”.equals(action) )

10

{

11	RecoverDefaultConfig();

12

}

13

}

14

};

9、定义ContentObserver，监听某个数据表

01	privateContentObserver mDownloadsObserver =newDownloadsChangeObserver(Downloads.CONTENT_URI);

02

03	privateclassDownloadsChangeObserverextendsContentObserver

04

{

05	publicDownloadsChangeObserver(Uri uri)

06

{

07	super(newHandler());

08

}

09

10

@Override

11	publicvoidonChange(booleanselfChange) {}

12

13

}

10、获得 手机UA

1	publicString getUserAgent()

2

{

3	String user_agent = ProductProperties.get(ProductProperties.USER_AGENT_KEY,null);

4

5	returnuser_agent;

6

}

11、清空手机上cookie

1	CookieSyncManager.createInstance (getApplicationContext() );

2

3	CookieManager.getInstance().removeAllCookie();

12、建立GPRS连接

01	//Dial the GPRS link.

02	privatebooleanopenDataConnection()

03

{

04	// Set up data connection.

05	DataConnection conn = DataConnection.getInstance();

06

07	if( connectMode ==0)

08

{

09	ret = conn.openConnection ( mContext, “cmwap”,"cmwap”, "cmwap” );

10

}

11

else

12

{

13	ret = conn.openConnection(mContext, “cmnet”,"","");

14

}

15

}

13、PreferenceActivity 用法

1	publicclassSettingextendsPreferenceActivity

2

{

3	publicvoidonCreate ( Bundle savedInstanceState )

4

{

5	super.onCreate ( savedInstanceState );

6	addPreferencesFromResource ( R.xml.settings );

7

}

8

}

Setting.xml:

1	Android:key=”seting2″

2

3	android:title=”@string/seting2″

4	android:summary=”@string/seting2″/>

5	android:key=”seting1″

6	android:title=”@string/seting1″

7	android:summaryOff=”@string/seting1summaryOff”

8	android:summaryOn=”@stringseting1summaryOff”/>

14、通过HttpClient从指定server获取数据

01	DefaultHttpClient httpClient =newDefaultHttpClient();

02

03	HttpGet method =newHttpGet(“/templets/default/index.html”);

04	HttpResponse resp;

05	Reader reader =null;

06

07

try{

08	// AllClientPNames.TIMEOUT

09	HttpParams params =newBasicHttpParams();

10	params.setIntParameter(AllClientPNames.CONNECTION_TIMEOUT,10000);

11

12	httpClient.setParams(params);

13	resp = httpClient.execute(method);

14	intstatus = resp.getStatusLine().getStatusCode();

15

16	if(status != HttpStatus.SC_OK)

17

{

18	returnfalse;

19

}

20

21	// HttpStatus.SC_OK;

22	returntrue;

23

24

}

25	catch(ClientProtocolException e)

26

{

27	// TODO Auto-generated catch block

28	e.printStackTrace();

29

}

30	catch(IOException e)

31

{

32	// TODO Auto-generated catch block

33	e.printStackTrace();

34

}

35

finally

36

{

37	if(reader !=null)

38

try

39

{

40	reader.close();

41

}

42	catch(IOException e)

43

{

44	// TODO Auto-generated catch block

45	e.printStackTrace();

46

}

47

}