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System directories

Method	Result
Environment.getDataDirectory()	/data
Environment.getDownloadCacheDirectory()	/cache
Environment.getRootDirectory()	/system

External storage directories

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public static <T> void recursiveSearchAndDeleteDuplicate(List<T> source, List<T> target) {
	T str = source.get(0);

	Iterator<T> it = source.iterator();
	while (it.hasNext()) {
		T e = it.next();
		if (str.equals(e)) {
			it.remove();
		}
	}

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public class FacebookLoginActivity extends Activity {
  private Button mLoginButton;
    
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_facebook_login);

    mLoginButton = findViewById(R.id.login_button);
    mLoginButton.setOnClickListener(new View.OnClickListener() {

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public class MyActivity extends Activity {

  	protected Handler mInternalHandler;
  
    @Override
  	protected void onCreate(Bundle savedInstanceState) {
    	super.onCreate(savedInstanceState);
        
        mInternalHandler = new InternalHandler(this);
    }

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<!-- 
 xmlns:tools="http://schemas.android.com/tools" for Graphical Layout View.
-->

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"

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// makeLogTag
${:importStatic(net.granoeste.commons.util.LogUtils.makeLogTag)}private static final String TAG = makeLogTag(${enclosing_type}.class);

// TRACE
${:importStatic(net.granoeste.commons.util.LogUtils.LOGV)}LOGV(TAG, "${enclosing_method}()"

// LOGV
${:importStatic(net.granoeste.commons.util.LogUtils.LOGV)}LOGV(TAG, ${cursor});

// LOGD

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boolean isLauncher = intent.hasCategory(Intent.CATEGORY_LAUNCHER);

if (!isLauncher) {

    Intent intent = new Intent(context, TopActivity.class);

    intent.setAction(Intent.ACTION_MAIN);
    intent.addCategory(Intent.CATEGORY_LAUNCHER);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP
        | Intent.FLAG_ACTIVITY_NEW_TASK

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public String getLocalIpAddress() {
    try {
        for (Enumeration<NetworkInterface> en = NetworkInterface
                .getNetworkInterfaces(); en.hasMoreElements();) {
            NetworkInterface intf = en.nextElement();
            for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
                InetAddress inetAddress = enumIpAddr.nextElement();
                if (!inetAddress.isLoopbackAddress()) {
                    return inetAddress.getHostAddress().toString();
                }

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// To implement state saving and restoration in the custom view...
// 
// You should implement the SavedState extend the BaseSavedState.
// You should be implemented to override the onSaveInstanceState and onRestoreInstanceState.
// TextView will be helpful.

// TextView 
public class TextView extends View implements ViewTreeObserver.OnPreDrawListener {

    /**

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    <!-- Default text typeface. -->
    <attr name="typeface">
        <enum name="normal" value="0" />
        <enum name="sans" value="1" />
        <enum name="serif" value="2" />
        <enum name="monospace" value="3" />
    </attr>

    <!-- Default text typeface style. -->
    <attr name="textStyle">