android 开发实用

Android很有用的代码片段
1：查看是否有存储卡插入

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1.String status=Environment.getExternalStorageState();   2.if(status.equals(Enviroment.MEDIA_MOUNTED))   3.{   4.   说明有SD卡插入   5.}

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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.

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.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

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

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

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

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.        }   9.    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

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

1.CookieSyncManager.createInstance(getApplicationContext());   2.        CookieManager.getInstance().removeAllCookie();  CookieSyncManager.createInstance(getApplicationContext());        CookieManager.getInstance().removeAllCookie();

11：建立GPRS连接

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

1.public class Setting extends PreferenceActivity   2.｛   3.    public void onCreate(Bundle savedInstanceState) {   4.        super.onCreate(savedInstanceState);   5.        addPreferencesFromResource(R.xml.settings)；   6.    }   7.｝   8.Setting.xml:   9.            android:key=”seting2″   10.            android:title=”@string/seting2″   11.            android:summary=”@string/seting2″/>   12.            android:key=”seting1″   13.            android:title=”@string/seting1″   14.            android:summaryOff=”@string/seting1summaryOff”   15.            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: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

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

1.  2.Toast.makeText(this._getApplicationContext(), R.string._item, Toast.LENGTH_SHORT).show();

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