这些片段在Android编程中很有用 (ZT)

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 

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	msgTextView.setText(R.string.push_me);

4：发送短信 

1	String body=”this is mms demo”;

2

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

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

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

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

7	startActivity(mmsintent);

 

5:发送彩信 

01	StringBuilder sb = new StringBuilder();

02

03	sb.append(”file://”);

04

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

06

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

08	// Below extra datas are all optional.

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

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

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

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

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

14

15	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	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 

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 

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 

1	public String getUserAgent()

2

{

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

4	return user_agent;

5

}

11：清空手机上cookie 

1	CookieSyncManager.createInstance(getApplicationContext());

2	CookieManager.getInstance().removeAllCookie();

12：建立GPRS连接

01	//Dial the GPRS link.

02	private boolean openDataConnection() {

03	// Set up data connection.

04	DataConnection conn = DataConnection.getInstance();

05	if (connectMode == 0) {

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

07

} else {

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

09

}

10

}

13：PreferenceActivity 用法 

setting.xml:

1	public class Setting extends PreferenceActivity

2

｛

3	public void onCreate(Bundle savedInstanceState) {

4	super.onCreate(savedInstanceState);

5	addPreferencesFromResource(R.xml.settings)；

6

}

7

｝

14:通过HttpClient从指定server获取数据

01	DefaultHttpClient httpClient = new DefaultHttpClient();

02	HttpGet method = new HttpGet(“http://www.baidu.com/1.html”);

03	HttpResponse resp;

04	Reader reader = null;

05

try {

06	// AllClientPNames.TIMEOUT

07	HttpParams params = new BasicHttpParams();

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

09	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

}

本文摘自：http://www.cmd100.com/bbs/thread-4674-1-1.html