1 /*
2  * Copyright (C) 2015 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 
17 package com.android.messaging.ui.mediapicker;
18 
19 import android.content.Context;
20 import android.graphics.Canvas;
21 import android.hardware.Camera;
22 import android.os.Bundle;
23 import android.os.Parcelable;
24 import android.util.AttributeSet;
25 import android.view.ViewGroup;
26 import android.widget.FrameLayout;
27 import com.android.messaging.R;
28 import com.android.messaging.ui.PersistentInstanceState;
29 import com.android.messaging.util.ThreadUtil;
30 
31 public class CameraMediaChooserView extends FrameLayout implements PersistentInstanceState {
32     private static final String KEY_CAMERA_INDEX = "camera_index";
33 
34     // True if we have at least queued an update to the view tree to support software rendering
35     // fallback
36     private boolean mIsSoftwareFallbackActive;
37 
CameraMediaChooserView(final Context context, final AttributeSet attrs)38     public CameraMediaChooserView(final Context context, final AttributeSet attrs) {
39         super(context, attrs);
40     }
41 
42     @Override
onSaveInstanceState()43     protected Parcelable onSaveInstanceState() {
44         final Bundle bundle = new Bundle();
45         bundle.putInt(KEY_CAMERA_INDEX, CameraManager.get().getCameraIndex());
46         return bundle;
47     }
48 
49     @Override
onRestoreInstanceState(final Parcelable state)50     protected void onRestoreInstanceState(final Parcelable state) {
51         if (!(state instanceof Bundle)) {
52             return;
53         }
54 
55         final Bundle bundle = (Bundle) state;
56         CameraManager.get().selectCameraByIndex(bundle.getInt(KEY_CAMERA_INDEX));
57     }
58 
59     @Override
saveState()60     public Parcelable saveState() {
61         return onSaveInstanceState();
62     }
63 
64     @Override
restoreState(final Parcelable restoredState)65     public void restoreState(final Parcelable restoredState) {
66         onRestoreInstanceState(restoredState);
67     }
68 
69     @Override
resetState()70     public void resetState() {
71         CameraManager.get().selectCamera(Camera.CameraInfo.CAMERA_FACING_BACK);
72     }
73 
74     @Override
onDraw(final Canvas canvas)75     protected void onDraw(final Canvas canvas) {
76         super.onDraw(canvas);
77         // If the canvas isn't hardware accelerated, we have to replace the HardwareCameraPreview
78         // with a SoftwareCameraPreview which supports software rendering
79         if (!canvas.isHardwareAccelerated() && !mIsSoftwareFallbackActive) {
80             mIsSoftwareFallbackActive = true;
81             // Post modifying the tree since we can't modify the view tree during a draw pass
82             ThreadUtil.getMainThreadHandler().post(new Runnable() {
83                 @Override
84                 public void run() {
85                     final HardwareCameraPreview cameraPreview =
86                             (HardwareCameraPreview) findViewById(R.id.camera_preview);
87                     if (cameraPreview == null) {
88                         return;
89                     }
90                     final ViewGroup parent = ((ViewGroup) cameraPreview.getParent());
91                     final int index = parent.indexOfChild(cameraPreview);
92                     final SoftwareCameraPreview softwareCameraPreview =
93                             new SoftwareCameraPreview(getContext());
94                     // Be sure to remove the hardware view before adding the software view to
95                     // prevent having 2 camera previews active at the same time
96                     parent.removeView(cameraPreview);
97                     parent.addView(softwareCameraPreview, index);
98                 }
99             });
100         }
101     }
102 }
103