How to Apply theme activity in android by programmatically?

Question

David Miller · Answer

Context class has a nice method calledand getThemeResId, however it's private thus you need to use reflection.Here's an example:@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_my);
    Log.e("TAG", "Def theme: " + R.style.AppTheme);
    Log.e("TAG", "Light theme: " + android.R.style.Theme_Light);
    Log.e("TAG", "Current theme id: " + getThemeId());
    setTheme(android.R.style.Theme_Light);
    Log.e("TAG", "Current theme id: " + getThemeId());
}
int getThemeId() {
    try {
        Classandlt;?andgt; wrapper = Context.class;
        Method method = wrapper.getMethod("getThemeResId");
        method.setAccessible(true);
        return (Integer) method.invoke(this);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return 0;
}

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How to Apply theme activity in android by programmatically?

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