Android實用的代碼片段常用代碼總結

2020-04-11 11:43:51

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1：查看是否有存儲卡插入

String status=Environment.getExternalStorageState();
if(status.equals(Enviroment.MEDIA_MOUNTED))
{
   說明有SD卡插入
}

2：讓某個Activity透明

OnCreate中不設Layout this.setTheme(R.style.Theme_Transparent);
以下是Theme_Transparent的定義（注意transparent_bg是一副透明的圖片）

3：在屏幕元素中設置句柄

使用Activity.findViewById來取得屏幕上的元素的句柄. 使用該句柄您可以設置或獲取任何該對象外露的值.

復制代碼代碼如下:

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

4：發送短信

復制代碼代碼如下:

 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：發送彩信

復制代碼代碼如下:

    
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：發送Mail

復制代碼代碼如下:

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：注冊一個BroadcastReceiver

復制代碼代碼如下:

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：定義ContentObserver，監聽某個數據表

復制代碼代碼如下:

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：獲得手機UA

復制代碼代碼如下:

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

10：清空手機上Cookie

復制代碼代碼如下:

CookieSyncManager.createInstance(getApplicationContext());
CookieManager.getInstance().removeAllCookie();11：建立GPRS連接

//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

復制代碼代碼如下:

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：通過HttpClient從指定server獲取數據

復制代碼代碼如下: