这些片段在Android编程中很有用

网上搜的，感觉挺好，希望能给和我一样的初学者带来方便

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

msgTextView.setText(R.string.push_me);


4：发送短信
view sourceprint?1 String body=”this is mms demo”;
Intent mmsintent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(”smsto”, number, null));
mmsintent.putExtra(Messaging.KEY_ACTION_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
view sourceprint?01 StringBuilder sb = new StringBuilder();
sb.append(”file://”);
sb.append(fd.getAbsoluteFile());
Intent intent = new Intent(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());
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
view sourceprint?1 Toast.makeText(this._getApplicationContext(), R.string._item, Toast.LENGTH_SHORT).show();


7：发送Mail

view sourceprint?1 mime = “img/jpg”;
shareIntent.setDataAndType(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
view sourceprint?1 registerReceiver(mMasterResetReciever, new IntentFilter(”OMS.action.MASTERRESET”));

private 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

view sourceprint?1 private ContentObserver mDownloadsObserver = new DownloadsChangeObserver(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
view sourceprint?1 public String getUserAgent()

{

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

return user_agent;

}


11：清空手机上cookie

view sourceprint?1 CookieSyncManager.createInstance(getApplicationContext());

CookieManager.getInstance().removeAllCookie();


12：建立GPRS连接

view sourceprint?01 //Dial the GPRS link.

private boolean openDataConnection() {

// Set up data connection.

DataConnection conn = DataConnection.getInstance();

if (connectMode == 0) {

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

} else {

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

}

}


13：PreferenceActivity 用法
setting.xml:

view sourceprint?1 public class Setting extends PreferenceActivity

｛

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

addPreferencesFromResource(R.xml.settings)；

}

｝

14:通过HttpClient从指定server获取数据
view sourceprint?01 DefaultHttpClient httpClient = new DefaultHttpClient();

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

HttpResponse resp;

Reader reader = null;

try {

// AllClientPNames.TIMEOUT

HttpParams params = new BasicHttpParams();

params.setIntParameter(AllClientPNames.CONNECTION_TIMEOUT, 10000);

httpClient.setParams(params);

resp = httpClient.execute(method);

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();

}

}