how to programatically theme an activity to be like a dialog?

user_2898715 0
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Question

How does one programatically (without touching the AndroidManifext.xml) set the theme of an Activity so that it looks like a dialog?

Note: I am ok with modifying the AndroidManifext.xml as long as it does not need to be modified in order to switch between making it look like a normal activity or a dialog.

What I've tried so far

I tried the following as per this stackoverflow answer:

public class DialogActivity extends Activity
{

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        setTheme(android.R.style.Theme_DeviceDefault_Dialog);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dialog);
        Log.d(TAG,"Build.VERSION.SDK_INT: "+Build.VERSION.SDK_INT); // 23
    }
}

But it ends up blacking out everything in the background.

I also saw this stackoverflow answer, and tried:

public class DialogActivity extends Activity
{

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        setTheme(android.R.style.Theme_DeviceDefault_Dialog);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dialog);
        getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
    }
}

but it ends up making everything black.

What do? Thank you.

android-dialog android-activity android java
4 Answers

I am late but still for future users you need to call the below code after setTheme() Calling this allows the Activity behind this one to be seen again. Once all such Activities have been redrawn

// setTheme()
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            try {
            Method getActivityOptions = Activity.class.getDeclaredMethod("getActivityOptions");
            getActivityOptions.setAccessible(true);
            Object options = getActivityOptions.invoke(activity);

            Class<?>[] classes = Activity.class.getDeclaredClasses();
            Class<?> translucentConversionListenerClazz = null;
            for (Class clazz : classes) {
                if (clazz.getSimpleName().contains("TranslucentConversionListener")) {
                    translucentConversionListenerClazz = clazz;
                }
            }
            Method convertToTranslucent = Activity.class.getDeclaredMethod("convertToTranslucent",
                    translucentConversionListenerClazz, ActivityOptions.class);
            convertToTranslucent.setAccessible(true);
            convertToTranslucent.invoke(activity, null, options);
        } catch (Throwable t) {
        }
        } else {
            try {
            Class<?>[] classes = Activity.class.getDeclaredClasses();
            Class<?> translucentConversionListenerClazz = null;
            for (Class clazz : classes) {
                if (clazz.getSimpleName().contains("TranslucentConversionListener")) {
                    translucentConversionListenerClazz = clazz;
                }
            }
            Method method = Activity.class.getDeclaredMethod("convertToTranslucent",
                    translucentConversionListenerClazz);
            method.setAccessible(true);
            method.invoke(activity, new Object[] {
                null
            });
        } catch (Throwable t) {
        }
        }
user_132465600
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