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Android开发者实用代码片段

AndroidJavaXMLUP
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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: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
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();  

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1 楼 danke54 2012-10-26  
自己备份用
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