Activities with Dialog theme doesn't always respect to LayoutParams. This class addresses this, so wrap_conetnt actually **does** wrap_content.

RespectLayoutParamsActivity.java

import android.support.v7.app.AppCompatActivity;
//import android.app.Activity; // import this if you don't want to use the AppComat package.
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.view.Window;
import android.view.WindowManager;

/**
 * the activity with a Dialog theme doesn't really respect the "wrap_content" params.
 * so we fix it here...
 * <p/>
 * Created by Palatis on 2016/4/4.
 */
public abstract class RespectLayoutParamsActivity extends AppCompatActivity {
// extends android.app.Activity if you don't want the AppCompat package
//public abstract class RespectLayoutParamsActivity extends Activity {
	/**
	 * get the root view of the view hierarchy.
	 * subclass should implement this to return the **real** root view, or it might make the window
	 * look weird.
	 *
	 * @return the root view
	 */
	protected abstract View getRootView();

	private boolean mPayRespect = false;

	@Override
	protected void onStart() {
		super.onStart();

		// force "fit-to-size", this should be done after super.onStart()
		if (mPayRespect)
			forceLayoutParams();
	}

	private void forceLayoutParams() {
		mPayRespect = false;

		View view = getRootView();
		ViewGroup.LayoutParams rlp = view.getLayoutParams();
		final int widthParam = rlp.width;
		final int heightParam = rlp.height;

		final Window window = getWindow();
		window.setLayout(widthParam, heightParam);
		final WindowManager.LayoutParams wlp = window.getAttributes();
		wlp.width = widthParam;
		wlp.height = heightParam;
		window.setAttributes(wlp); // we have to call this, else the window won't resize.

		// Travel up the tree until fail, modifying the LayoutParams
		do {
			final ViewParent parent = view.getParent();
			if (parent != null) {
				// Get the view
				try {
					view = (View) parent;
				} catch (ClassCastException e) {
					// This will happen when at the top view, it cannot be cast to a View
					break;
				}

				// Modify the layout
				final ViewGroup.LayoutParams lp = view.getLayoutParams();
				if (lp != null) {
					lp.width = widthParam;
					lp.height = heightParam;
				}
			}
		} while (view.getParent() != null);

		// Request a layout to be re-done
		view.requestLayout();
	}
}