转--Android实用的代码片段 常用代码总结

这篇文章主要介绍了Android实用的代码片段 常用代码总结,需要的朋友可以参考下

1：查看是否有存储卡插入

复制代码 代码如下:

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.

复制代码
代码如下:

TextView msgTextView =
(TextView)findViewById(R.id.msg);
msgTextView.setText(R.string.push_me);

4：发送短信

复制代码
代码如下:

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

复制代码
代码如下:

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：发送Mail

复制代码
代码如下:

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);

7：注册一个BroadcastReceiver

复制代码
代码如下:

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();
}
}
}

8：定义ContentObserver，监听某个数据表

复制代码
代码如下:

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) {｝
}

9：获得 手机UA

复制代码
代码如下:

public String getUserAgent()

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

return user_agent;
}

10：清空手机上Cookie

复制代码
代码如下:

CookieSyncManager.createInstance(getApplicationContext());

CookieManager.getInstance().removeAllCookie();11：建立GPRS连接

//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", "", "");
}

}

12：PreferenceActivity 用法

复制代码
代码如下:

public class Setting extends
PreferenceActivity
｛
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);

addPreferencesFromResource(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"/>

13：通过HttpClient从指定server获取数据

复制代码
代码如下:

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();

}
}