android项目代码结构 android代码大全

 

这篇文章主要介绍了Android实用的代码片段 常用代码总结,需要的朋友可以参考下

 

 

1：查看是否有存储卡插入

 

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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.

 

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

4：发送短信

 

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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

 

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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

 

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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

 

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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

 

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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

 

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public String getUserAgent()
    
{
           String user_agent = 
ProductProperties.get(ProductProperties.USER_AGENT_KEY, null);
            
return user_agent;
    }

 

10：清空手机上Cookie

 

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CookieSyncManager.createInstance(getApplicationContext());
        
CookieManager.getInstance().removeAllCookie();11：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", "", "");
            }
    
}

 

12：PreferenceActivity 用法

 

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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

 

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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();
                
}
            }