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Android开发者适用代码片段

热度：80   发布时间：2016-05-01 16:26:09.0
Android开发者实用代码片段

Android很有用的代码片段
1：查看是否有存储卡插入
Java代码 复制代码
  1. ??
  2. String?status=Environment.getExternalStorageState(); ??
  3. if(status.equals(Enviroment.MEDIA_MOUNTED)) ??
  4. { ??
  5. ???说明有SD卡插入 ??
  6. }??
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.
Java代码 复制代码
  1. TextView?msgTextView?=?(TextView)findViewById(R.id.msg); ??
  2. ???msgTextView.setText(R.string.push_me);???
TextView msgTextView = (TextView)findViewById(R.id.msg);   msgTextView.setText(R.string.push_me);

4：发送短信
Java代码 复制代码
  1. ?String?body=”this?is?mms?demo”; ??
  2. Intent?mmsintent?=?new?Intent(Intent.ACTION_SENDTO,?Uri.fromParts(”smsto”,?number,?null)); ??
  3. mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_BODY,?body); ??
  4. mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_COMPOSE_MODE,?true); ??
  5. mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_EXIT_ON_SENT,?true); ??
  6. ?startActivity(mmsintent);??
            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
Java代码 复制代码
  1. StringBuilder?sb?=?new?StringBuilder(); ??
  2. ?sb.append(”file://”); ??
  3. ?sb.append(fd.getAbsoluteFile()); ??
  4. ?Intent?intent?=?new?Intent(Intent.ACTION_SENDTO,?Uri.fromParts(”mmsto”,?number,?null)); ??
  5. ?//?Below?extra?datas?are?all?optional. ??
  6. ?intent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_SUBJECT,?subject); ??
  7. ?intent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_BODY,?body); ??
  8. ?intent.putExtra(Messaging.KEY_ACTION_SENDTO_CONTENT_URI,?sb.toString()); ??
  9. ?intent.putExtra(Messaging.KEY_ACTION_SENDTO_COMPOSE_MODE,?composeMode); ??
  10. ?intent.putExtra(Messaging.KEY_ACTION_SENDTO_EXIT_ON_SENT,?exitOnSent); ??
  11. ?startActivity(intent);??
           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
Java代码 复制代码
  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);??
             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
Java代码 复制代码
  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. ????};??
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
Java代码 复制代码
  1. ??
  2. ??
  3. private?ContentObserver?mDownloadsObserver?=?new?DownloadsChangeObserver(Downloads.CONTENT_URI); ??
  4. private?class?DownloadsChangeObserver?extends?ContentObserver?{ ??
  5. ????????public?DownloadsChangeObserver(Uri?uri)?{ ??
  6. ????????????super(new?Handler()); ??
  7. ????????} ??
  8. ????????@Override??
  9. ????????public?void?onChange(boolean?selfChange)?{｝?? ??
  10. ????????} ??
  11. ????
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
Java代码 复制代码
  1. public?String?getUserAgent() ??
  2. ????{ ??
  3. ???????????String?user_agent?=?ProductProperties.get(ProductProperties.USER_AGENT_KEY,?null); ??
  4. ????????????return?user_agent; ??
  5. ????}??
public String getUserAgent()    {           String user_agent = ProductProperties.get(ProductProperties.USER_AGENT_KEY, null);            return user_agent;    }


10：清空手机上Cookie
Java代码 复制代码
  1. CookieSyncManager.createInstance(getApplicationContext()); ??
  2. ????????CookieManager.getInstance().removeAllCookie();??
CookieSyncManager.createInstance(getApplicationContext());        CookieManager.getInstance().removeAllCookie();


11：建立GPRS连接
Java代码 复制代码
  1. //Dial?the?GPRS?link. ??
  2. ?private?boolean?openDataConnection()?{ ??
  3. ?????//?Set?up?data?connection. ??
  4. ?????DataConnection?conn?=?DataConnection.getInstance();????? ??
  5. ?????????if?(connectMode?==?0)?{ ??
  6. ?????????????ret?=?conn.openConnection(mContext,?“cmwap”,?“cmwap”,?“cmwap”); ??
  7. ?????????}?else?{ ??
  8. ?????????????ret?=?conn.openConnection(mContext,?“cmnet”,?“”,?“”); ??
  9. ?????????} ??
  10. ?}??
   //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
Java代码 复制代码
  1. ??
  2. public?class?Setting?extends?PreferenceActivity ??
  3. ｛ ??
  4. ????public?void?onCreate(Bundle?savedInstanceState)?{ ??
  5. ????????super.onCreate(savedInstanceState); ??
  6. ????????addPreferencesFromResource(R.xml.settings)； ??
  7. ????} ??
  8. ｝ ??
  9. Setting.xml: ??
  10. ????????????android:key=”seting2″ ??
  11. ????????????android:title=”@string/seting2″ ??
  12. ????????????android:summary=”@string/seting2″/> ??
  13. ????????????android:key=”seting1″ ??
  14. ????????????android:title=”@string/seting1″ ??
  15. ????????????android:summaryOff=”@string/seting1summaryOff” ??
  16. ????????????android:summaryOn=”@stringseting1summaryOff”/>??
public class Setting extends PreferenceActivity｛    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        addPreferencesFromResource(R.xml.settings)；    }｝Setting.xml:            android:key=”seting2″            android:[email protected]/seting2″            android:[email protected]/seting2″/>            android:key=”seting1″            android:[email protected]/seting1″            android:[email protected]/seting1summaryOff”            android:[email protected]/>

13：通过HttpClient从指定server获取数据
Java代码 复制代码
  1. ?DefaultHttpClient?httpClient?=?new?DefaultHttpClient(); ??
  2. HttpGet?method?=?new?HttpGet(“http://www.baidu.com/1.html”); ??
  3. HttpResponse?resp; ??
  4. Reader?reader?=?null; ??
  5. try?{ ??
  6. ????//?AllClientPNames.TIMEOUT ??
  7. ????HttpParams?params?=?new?BasicHttpParams(); ??
  8. ????params.setIntParameter(AllClientPNames.CONNECTION_TIMEOUT,?10000); ??
  9. ????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. }??
             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();                }            }

14：显示toast
Java代码 复制代码
  1. ??
  2. Toast.makeText(this._getApplicationContext(),?R.string._item,?Toast.LENGTH_SHORT).show();??

1 楼 冬泉谷小德 2012-03-01  
你抄归抄， 不能用 你发出来有什么用啊。。。 没事别导出乱抄，搞的别人稀里糊涂德
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