Android - Change application theme on onClick

Question

I know there is a way to change the default application theme when a button is clicked. Blackmart developers did it. Ive already searched google like 1000 pages but i found exactly this (doesn't work)

getApplication().setTheme(Theme.Holo) 

As I already created a new style in res / values ​​/styles.xml, is there any other way to dynamically change it? Even restarting the application?

Answer 1

The following blog may solve your problem:

http://mrbool.com/how-to-change-the-layout-theme-of-an-android-application/25837

Copy blog code for quick reference:

Assuming you have already identified the following three topics in the XML file R.style.FirstTheme , R.style.SecondTheme and R.style.ThirdTheme

 import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; public class ChangeThemeActivity extends Activity implements OnClickListener { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Utils.onActivityCreateSetTheme(this); setContentView(R.layout.main); findViewById(R.id.button1).setOnClickListener(this); findViewById(R.id.button2).setOnClickListener(this); findViewById(R.id.button3).setOnClickListener(this); } @Override public void onClick(View v) { // TODO Auto-generated method stub switch (v.getId()) { case R.id.button1: Utils.changeToTheme(this, Utils.THEME_DEFAULT); break; case R.id.button2: Utils.changeToTheme(this, Utils.THEME_WHITE); break; case R.id.button3: Utils.changeToTheme(this, Utils.THEME_BLUE); break; } } } 

Let's write the code below in the "Utils" file:

 import android.app.Activity; import android.content.Intent; public class Utils { private static int sTheme; public final static int THEME_DEFAULT = 0; public final static int THEME_WHITE = 1; public final static int THEME_BLUE = 2; /** * Set the theme of the Activity, and restart it by creating a new Activity of the same type. */ public static void changeToTheme(Activity activity, int theme) { sTheme = theme; activity.finish(); activity.startActivity(new Intent(activity, activity.getClass())); } /** Set the theme of the activity, according to the configuration. */ public static void onActivityCreateSetTheme(Activity activity) { switch (sTheme) { default: case THEME_DEFAULT: activity.setTheme(R.style.FirstTheme); break; case THEME_WHITE: activity.setTheme(R.style.SecondTheme); break; case THEME_BLUE: activity.setTheme(R.style.Thirdheme); break; } } } 

Hope this helps ...

EDIT 1:

The following reason AlertDialog does not accept a custom theme:

The implementation in Builder.create () is:

 public AlertDialog create() { final AlertDialog dialog = new AlertDialog(P.mContext); P.apply(dialog.mAlert); [...] } 

which calls the "AlertDialog" constructor, created not by a theme, which looks like this:

 protected AlertDialog(Context context) { this(context, com.android.internal.R.style.Theme_Dialog_Alert); } 

AlertDialog has a second constructor for changing themes:

 protected AlertDialog(Context context, int theme) { super(context, theme); [...] } 

that Builder just doesn't call.

Check out the following post for more relevant fixes.

How to change theme for AlertDialog

Below is the most voted answer:

  new AlertDialog.Builder( new ContextThemeWrapper(context, android.R.style.Theme_Dialog))