Android Study Notes

Here are some of my study notes during the development process of TipsCalc.


Hide Soft Keyboard
- InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(myEditText.getWindowToken(), 0);

HideStatusBar (in Manifest)
- <activity android:name="blahblah"
            android:label="@string/app_name"
            android:theme="@android:style/Theme.NoTitleBar.Fullscreen">
- .Fullscreen will hide status bar and title bar

Remove focus on Edit text from App startup
- <LinearLayout android:orientation="vertical"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:focusable="true" android:focusableInTouchMode="true">

Prevent screen rotation
- <activity android:name=".TipsCalc" android:label="@string/app_name"
android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
android:screenOrientation="portrait">
- the other direction is screenOrientation="landscape"

Set a different view when orientation changes
- http://stackoverflow.com/questions/456211/activity-restart-on-rotation-android

Keep data when rotation happens
- save everything in Bundle in onSaveInstanceState(Bundle outState)
- Bundle is like a dictionary in Python or hashtable in Java
- use method like Bundle.putString(key, value)
- restore everything when onRestoreInstanceState(Bundle savedInstanceState)
- use method like Bundle.getString(key, value)

EditText not fullscreen when landscape
- mEditText.setImeOptions(EditorInfo.IME_FLAG_NO_EXTRACT_UI);

Making an luncher Icon
- http://blog.mikandi.com/all-entries/developers/design-developers/tutorial-design-a-simple-app-icon-with-photoshop/

End User Licensing
- http://bees4honey.com/blog/tutorial/adding-eula-to-android-app/


Checking WiFi/3G connected to a network (not on/off)
- ConnectivityManager connManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo mWifi = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
    if (mWifi.isConnected())
        //if wifi connected
NetworkInfo mMobile = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
    if (mMobile.isConnected())
        //if internet connected

Request Rating in Androd App Market
- http://www.androidsnippets.com/prompt-engaged-users-to-rate-your-app-in-the-android-market-appirater
- Code in UTORLogin maybe better

Progress Dialog and Android Threading
- http://www.vogella.de/articles/AndroidPerformance/article.html