自定义全屏Dialog

关键在于设置Style

    <style name="Dialog_Fullscreen">
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:windowIsFloating">false</item>
        <item name="android:windowFullscreen">false</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:backgroundDimEnabled">true</item>
    </style>

public class SpinnerDialog extends Dialog {

	private Context mContext;

	private ArrayAdapter<CharSequence> mAdapter = null;

	private OnConfirmListener mListener;

	private View mRoot;

	public SpinnerDialog(Context context) {
		this(context, R.style.Dialog_Fullscreen);
	}

	public SpinnerDialog(Context context, int theme) {
		super(context, R.style.Dialog_Fullscreen);
		mContext = context;
	}

	public void setSpinnerData(int resId) {
		mAdapter = ArrayAdapter.createFromResource(mContext, resId,
				android.R.layout.simple_spinner_item);
	}

	public void setSpinnerData(ArrayAdapter<CharSequence> adapter) {
		this.mAdapter = adapter;
	}

	private View getView() {

		mAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

		// get layout
		View v = LayoutInflater.from(mContext).inflate(R.layout.spinner_dialog,
				null);

		// bind data
		final Spinner spinner = (Spinner) v.findViewById(R.id.item_selector);
		spinner.setAdapter(mAdapter);

		// set click event
		v.findViewById(R.id.btnOK).setOnClickListener(
				new View.OnClickListener() {

					public void onClick(View v) {
						if (mListener != null) {
							int idx = spinner.getSelectedItemPosition();
							String val = spinner.getSelectedItem().toString();
							mListener.onConfirm(idx, val);
						}
						dismiss();
					}
				});

		v.findViewById(R.id.btnCancel).setOnClickListener(
				new View.OnClickListener() {

					public void onClick(View v) {
						cancel();
					}
				});

		return v;
	}

	public void setOnConfirmListener(OnConfirmListener listener) {
		mListener = listener;
	}

	@Override
	protected void onStart() {
		super.onStart();
		
		if (mRoot == null) {
			mRoot = getView();
			setContentView(mRoot);
		}
	}

	/**
	 * Interface definition for a callback to be invoked when press OK button.
	 */
	public interface OnConfirmListener {

		public void onConfirm(int idx, String value);
	}
}

调用

SpinnerDialog dlg = new SpinnerDialog(this);
dlg.setSpinnerData(R.array.xxx);
dlg.setOnConfirmListener(listener);