Android程序開發技巧速查

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

4:發送短信

        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

           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);

7：發送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:注冊一個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:定義ContentObserver，監聽某個數據表

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:獲得 手機UA

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