Android从零开发之常用代码片段-优快云博客

本文链接：https://blog.youkuaiyun.com/zxjzzg/article/details/8758550

1、查看是否有存储卡插入

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.

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

4、发送短信

String body=”thisis 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

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、显示toast

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

 7、发送Mail 
  
   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);

8、注册一个BroadcastReceiver

 
        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();  
       
        }  
       
        }  
       
        };

9、定义ContentObserver，监听某个数据表

 
        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) {}  
       
        }

10、获得手机UA

 
    public 
     String getUserAgent()   
   
    {   
   
    String user_agent = ProductProperties.get(ProductProperties.USER_AGENT_KEY, 
    null 
    );   
   
    return 
    user_agent;   
   
    } 
   
 11、清空手机上cookie 
  
        CookieSyncManager.createInstance (getApplicationContext() );  
       
        CookieManager.getInstance().removeAllCookie(); 
       
 12、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”, 
    "" 
    ,  
    "" 
    );  
   
    }  
   
    }  
   
 13、PreferenceActivity 用法 
  
    public 
     class 
    Setting  
    extends  
    PreferenceActivity   
   
    {   
   
    public 
    void 
    onCreate ( Bundle savedInstanceState )  
   
    {  
   
    super 
    .onCreate ( savedInstanceState );  
   
    addPreferencesFromResource ( R.xml.settings );   
   
    }  
   
    } 
   
 14、通过HttpClient从指定server获取数据 
  
    DefaultHttpClient httpClient = 
    new 
    DefaultHttpClient();  
   
    HttpGet method = 
    new 
    HttpGet(“/templets/ 
    default 
    /index.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();  
   
    }  
   
    }