android Titel mit Regenbogen-Effekt

Question

Ich brauche einen Regenbogeneffekt auf den Titel, wie

Bild hinzuzufügen.

Irgendwelche Ideen?

Ich fand einige Antworten für Textview, aber nichts für den Titel in der Symbolleiste

Answer 1

public static TextView getToolbarTitleView(ActionBarActivity activity, Toolbar toolbar){ 
    ActionBar actionBar = activity.getSupportActionBar(); 
    CharSequence actionbarTitle = null; 
    if(actionBar != null) 
     actionbarTitle = actionBar.getTitle(); 
    actionbarTitle = TextUtils.isEmpty(actionbarTitle) ? toolbar.getTitle() : actionbarTitle; 
    if(TextUtils.isEmpty(actionbarTitle)) return null; 
    // can't find if title not set 
    for(int i= 0; i < toolbar.getChildCount(); i++){ 
     View v = toolbar.getChildAt(i); 
     if(v != null && v instanceof TextView){ 
      TextView t = (TextView) v; 
      CharSequence title = t.getText(); 
      if(!TextUtils.isEmpty(title) && actionbarTitle.equals(title) && t.getId() == View.NO_ID){ 
       //Toolbar does not assign id to views with layout params SYSTEM, hence getId() == View.NO_ID 
       //in same manner subtitle TextView can be obtained. 
       return t; 
      } 
     } 
    } 
    return null; 
} 



TextView tv= getToolBarTitleView(activity,toolbar); 
if(tv!=null){ 
    Shader textShader=new LinearGradient(0, 0, 0, 20, 
    new int[]{Color.YOURCOLOR,Color.YOURCOLOR}, 
    new float[]{0, 1}, TileMode.CLAMP); 
    tv.getPaint().setShader(textShader); 
} 
else{ 
    Log.e("MYPROJECT","No textview in toolbar . . . "); 
}