SearchActivityView.java revision 11234b9966c6b0e5c17d00e3b973c0d49a8d1f57 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.quicksearchbox.ui;
18
19import android.app.Activity;
20import android.content.Context;
21import android.util.AttributeSet;
22import android.view.KeyEvent;
23import android.view.inputmethod.InputMethodManager;
24import android.widget.RelativeLayout;
25
26/**
27 * Finishes the containing activity on BACK, even if input method is showing.
28 */
29public class SearchActivityView extends RelativeLayout {
30
31    public SearchActivityView(Context context) {
32        super(context);
33    }
34
35    public SearchActivityView(Context context, AttributeSet attrs) {
36        super(context, attrs);
37    }
38
39    public SearchActivityView(Context context, AttributeSet attrs, int defStyle) {
40        super(context, attrs, defStyle);
41    }
42
43    private Activity getActivity() {
44        Context context = getContext();
45        if (context instanceof Activity) {
46            return (Activity) context;
47        } else {
48            return null;
49        }
50    }
51
52    /**
53     * Hides the input method.
54     */
55    protected void hideInputMethod() {
56        InputMethodManager imm = (InputMethodManager)
57                getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
58        if (imm != null) {
59            imm.hideSoftInputFromWindow(getWindowToken(), 0);
60        }
61    }
62
63    /**
64     * Overrides the handling of the back key to dismiss the activity.
65     */
66    @Override
67    public boolean dispatchKeyEventPreIme(KeyEvent event) {
68        Activity activity = getActivity();
69        if (activity != null && event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
70            KeyEvent.DispatcherState state = getKeyDispatcherState();
71            if (state != null) {
72                if (event.getAction() == KeyEvent.ACTION_DOWN
73                        && event.getRepeatCount() == 0) {
74                    state.startTracking(event, this);
75                    return true;
76                } else if (event.getAction() == KeyEvent.ACTION_UP
77                        && !event.isCanceled() && state.isTracking(event)) {
78                    hideInputMethod();
79                    activity.onBackPressed();
80                    return true;
81                }
82            }
83        }
84        return super.dispatchKeyEventPreIme(event);
85    }
86}
87