Android开发常用代码片段

最新推荐文章于 2023-08-18 14:52:09 发布

limengwe

最新推荐文章于 2023-08-18 14:52:09 发布

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分类专栏： Android_ 文章标签：常用代码片段

本文链接：https://blog.youkuaiyun.com/OnlyOneCoder/article/details/8542048

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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=”this is
 mms demo”;

2
 
3
Intent
 mmsintent = new Intent(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 = 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
 
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
private BroadcastReceiver
 mMasterResetReciever = new BroadcastReceiver()

04
{

05
        public void onReceive(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
private ContentObserver
 mDownloadsObserver = newDownloadsChangeObserver(Downloads.CONTENT_URI);

02
 
03
private class DownloadsChangeObserver extends ContentObserver

04
{

05
        public DownloadsChangeObserver(Uri
 uri)

06
        {

07
            super(new Handler());

08
        }

09
 
10
        @Override

11
        public void onChange(boolean selfChange)
 {}

12
   
13
}

10、获得手机UA

1
public String
 getUserAgent()

2
{

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

4
     
5
    return user_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
private boolean openDataConnection()

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
public class Setting extends PreferenceActivity

2
{

3
    public void onCreate
 ( 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 = new DefaultHttpClient();

02
 
03
          HttpGet
 method = new HttpGet(“/templets/default/index.html”);

04
          HttpResponse
 resp;

05
          Reader
 reader = null;

06
 
07
          try {

08
              //
 AllClientPNames.TIMEOUT

09
              HttpParams
 params = new BasicHttpParams();

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

11
              
12
              httpClient.setParams(params);

13
              resp
 = httpClient.execute(method);

14
              int status
 = resp.getStatusLine().getStatusCode();

15
              
16
              if (status
 != HttpStatus.SC_OK)

17
              {

18
                 return false;

19
              }

20
 
21
              //
 HttpStatus.SC_OK;

22
              return true;

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
      }