From e03c25996424674a7015429022f850112d2d5aaf Mon Sep 17 00:00:00 2001
From: Yuichi Araki <yaraki@google.com>
Date: Tue, 29 Mar 2016 10:49:48 +0900
Subject: [PATCH] Basic camera preview on Camera1

Change-Id: Iace32d2a230016229b60084bfe060c4ec7bca8b5
---
 build.gradle                                  |   2 +-
 demo/src/main/AndroidManifest.xml             |   4 +-
 .../android/cameraview/demo/MainActivity.java |  19 ++
 demo/src/main/res/values/styles.xml           |   2 +-
 library/build.gradle                          |   5 +
 library/src/androidTest/AndroidManifest.xml   |  23 +++
 .../cameraview/CameraViewActivity.java        |  47 +++++
 .../android/cameraview/CameraViewTest.java    |  79 ++++++--
 .../android/cameraview/CameraViewImpl.java    |  33 ++++
 .../google/android/cameraview/Camera1.java    | 181 ++++++++++++++++++
 .../google/android/cameraview/CameraView.java |  35 ++++
 .../main/res/layout/activity_camera_view.xml  |  24 +++
 library/src/main/res/layout/camera_view.xml   |  21 ++
 13 files changed, 459 insertions(+), 16 deletions(-)
 create mode 100644 library/src/androidTest/AndroidManifest.xml
 create mode 100644 library/src/androidTest/java/com/google/android/cameraview/CameraViewActivity.java
 create mode 100644 library/src/main/base/com/google/android/cameraview/CameraViewImpl.java
 create mode 100644 library/src/main/camera1/com/google/android/cameraview/Camera1.java
 create mode 100644 library/src/main/res/layout/activity_camera_view.xml
 create mode 100644 library/src/main/res/layout/camera_view.xml

diff --git a/build.gradle b/build.gradle
index e293b0d3..db868459 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.1.0-alpha3'
+        classpath 'com.android.tools.build:gradle:2.1.0-alpha4'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/demo/src/main/AndroidManifest.xml b/demo/src/main/AndroidManifest.xml
index 912faf5d..59065aba 100644
--- a/demo/src/main/AndroidManifest.xml
+++ b/demo/src/main/AndroidManifest.xml
@@ -14,12 +14,14 @@
 <manifest package="com.google.android.cameraview.demo"
           xmlns:android="http://schemas.android.com/apk/res/android">
 
+    <uses-permission android:name="android.permission.CAMERA"/>
+
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:supportsRtl="true"
-        android:theme="@style/AppTheme">
+        android:theme="@style/Theme.Demo">
 
         <activity android:name=".MainActivity">
             <intent-filter>
diff --git a/demo/src/main/java/com/google/android/cameraview/demo/MainActivity.java b/demo/src/main/java/com/google/android/cameraview/demo/MainActivity.java
index 76be2b55..1dbcad50 100644
--- a/demo/src/main/java/com/google/android/cameraview/demo/MainActivity.java
+++ b/demo/src/main/java/com/google/android/cameraview/demo/MainActivity.java
@@ -16,15 +16,34 @@
 
 package com.google.android.cameraview.demo;
 
+import com.google.android.cameraview.CameraView;
+
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 
 public class MainActivity extends AppCompatActivity {
 
+    private CameraView mCameraView;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+        mCameraView = (CameraView) findViewById(R.id.camera);
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        mCameraView.onResume();
+        mCameraView.startPreview();
+    }
+
+    @Override
+    protected void onPause() {
+        mCameraView.stopPreview();
+        mCameraView.onPause();
+        super.onPause();
     }
 
 }
diff --git a/demo/src/main/res/values/styles.xml b/demo/src/main/res/values/styles.xml
index 39a975aa..e4ea791d 100644
--- a/demo/src/main/res/values/styles.xml
+++ b/demo/src/main/res/values/styles.xml
@@ -14,7 +14,7 @@
 <resources>
 
     <!-- Base application theme. -->
-    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+    <style name="Theme.Demo" parent="Theme.AppCompat.Light.NoActionBar">
         <!-- Customize your theme here. -->
         <item name="colorPrimary">@color/primary</item>
         <item name="colorPrimaryDark">@color/primaryDark</item>
diff --git a/library/build.gradle b/library/build.gradle
index 38080a2c..13806dd3 100644
--- a/library/build.gradle
+++ b/library/build.gradle
@@ -29,6 +29,11 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+    sourceSets {
+        main.java.srcDirs += 'src/main/base'
+        main.java.srcDirs += 'src/main/camera1'
+        main.java.srcDirs += 'src/main/camera2'
+    }
 }
 
 dependencies {
diff --git a/library/src/androidTest/AndroidManifest.xml b/library/src/androidTest/AndroidManifest.xml
new file mode 100644
index 00000000..809e31e6
--- /dev/null
+++ b/library/src/androidTest/AndroidManifest.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Copyright (C) 2016 The Android Open Source Project
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+         http://www.apache.org/licenses/LICENSE-2.0
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
+<manifest package="com.google.android.cameraview"
+          xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.CAMERA"/>
+
+    <application>
+        <activity android:name=".CameraViewActivity"/>
+    </application>
+
+</manifest>
diff --git a/library/src/androidTest/java/com/google/android/cameraview/CameraViewActivity.java b/library/src/androidTest/java/com/google/android/cameraview/CameraViewActivity.java
new file mode 100644
index 00000000..f5a3985d
--- /dev/null
+++ b/library/src/androidTest/java/com/google/android/cameraview/CameraViewActivity.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.android.cameraview;
+
+import android.app.Activity;
+import android.os.Bundle;
+
+public class CameraViewActivity extends Activity {
+
+    private CameraView mCameraView;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_camera_view);
+        mCameraView = (CameraView) findViewById(R.id.camera);
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        mCameraView.onResume();
+        mCameraView.startPreview();
+    }
+
+    @Override
+    protected void onPause() {
+        mCameraView.stopPreview();
+        mCameraView.onPause();
+        super.onPause();
+    }
+
+}
diff --git a/library/src/androidTest/java/com/google/android/cameraview/CameraViewTest.java b/library/src/androidTest/java/com/google/android/cameraview/CameraViewTest.java
index 422902e3..f0ecb350 100644
--- a/library/src/androidTest/java/com/google/android/cameraview/CameraViewTest.java
+++ b/library/src/androidTest/java/com/google/android/cameraview/CameraViewTest.java
@@ -16,30 +16,83 @@
 
 package com.google.android.cameraview;
 
+import org.hamcrest.Matcher;
+import org.junit.Rule;
 import org.junit.Test;
+import org.junit.runner.RunWith;
 
-import android.content.Context;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.annotation.UiThreadTest;
-import android.support.test.rule.UiThreadTestRule;
+import android.graphics.Bitmap;
+import android.os.SystemClock;
+import android.support.test.espresso.NoMatchingViewException;
+import android.support.test.espresso.UiController;
+import android.support.test.espresso.ViewAction;
+import android.support.test.espresso.ViewAssertion;
+import android.support.test.rule.ActivityTestRule;
+import android.support.test.runner.AndroidJUnit4;
+import android.view.TextureView;
+import android.view.View;
 
-import static org.hamcrest.CoreMatchers.is;
-import static org.junit.Assert.assertThat;
+import static android.support.test.espresso.Espresso.onView;
+import static android.support.test.espresso.assertion.ViewAssertions.matches;
+import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
+import static android.support.test.espresso.matcher.ViewMatchers.withId;
+import static junit.framework.Assert.assertFalse;
 
+@RunWith(AndroidJUnit4.class)
 public class CameraViewTest {
 
-    public final UiThreadTestRule rule;
+    @Rule
+    public final ActivityTestRule<CameraViewActivity> rule;
 
     public CameraViewTest() {
-        rule = new UiThreadTestRule();
+        rule = new ActivityTestRule<>(CameraViewActivity.class);
     }
 
     @Test
-    @UiThreadTest
-    public void testConstructor() {
-        Context context = InstrumentationRegistry.getTargetContext();
-        CameraView cameraView = new CameraView(context);
-        assertThat(cameraView.getChildCount(), is(0));
+    public void testSetup() {
+        onView(withId(R.id.camera))
+                .check(matches(isDisplayed()));
+        onView(withId(R.id.texture_view))
+                .check(matches(isDisplayed()));
+    }
+
+    @Test
+    public void preview_isShowing() {
+        onView(withId(R.id.texture_view))
+                .check(matches(isDisplayed()))
+                // TODO: Replace below with an IdlingCallback when state listener is implemented
+                .perform(new WaitAction())
+                .check(new ViewAssertion() {
+                    @Override
+                    public void check(View view, NoMatchingViewException noViewFoundException) {
+                        TextureView textureView = (TextureView) view;
+                        Bitmap bitmap = textureView.getBitmap();
+                        int topLeft = bitmap.getPixel(0, 0);
+                        int topRight = bitmap.getPixel(0, bitmap.getHeight() - 1);
+                        int bottomLeft = bitmap.getPixel(bitmap.getWidth() - 1, 0);
+                        assertFalse(topLeft == topRight && topRight == bottomLeft);
+                    }
+                });
+    }
+
+    // A temporary workaround
+    private static class WaitAction implements ViewAction {
+
+        @Override
+        public Matcher<View> getConstraints() {
+            return isDisplayed();
+        }
+
+        @Override
+        public String getDescription() {
+            return "aaa";
+        }
+
+        @Override
+        public void perform(UiController uiController, View view) {
+            SystemClock.sleep(1000);
+        }
+
     }
 
 }
diff --git a/library/src/main/base/com/google/android/cameraview/CameraViewImpl.java b/library/src/main/base/com/google/android/cameraview/CameraViewImpl.java
new file mode 100644
index 00000000..1b54247d
--- /dev/null
+++ b/library/src/main/base/com/google/android/cameraview/CameraViewImpl.java
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.android.cameraview;
+
+import android.view.TextureView;
+
+abstract class CameraViewImpl {
+
+    abstract TextureView.SurfaceTextureListener getSurfaceTextureListener();
+
+    abstract void onResume();
+
+    abstract void onPause();
+
+    abstract void startPreview();
+
+    abstract void stopPreview();
+
+}
diff --git a/library/src/main/camera1/com/google/android/cameraview/Camera1.java b/library/src/main/camera1/com/google/android/cameraview/Camera1.java
new file mode 100644
index 00000000..d8c0e1af
--- /dev/null
+++ b/library/src/main/camera1/com/google/android/cameraview/Camera1.java
@@ -0,0 +1,181 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.android.cameraview;
+
+import android.content.Context;
+import android.graphics.SurfaceTexture;
+import android.hardware.Camera;
+import android.view.Surface;
+import android.view.TextureView;
+import android.view.WindowManager;
+
+import java.io.IOException;
+
+@SuppressWarnings("deprecation")
+class Camera1 extends CameraViewImpl {
+
+    private static final int INVALID_CAMERA_ID = -1;
+
+    private final Context mContext;
+
+    private int mCameraId;
+
+    private Camera mCamera;
+
+    private final Camera.CameraInfo mCameraInfo = new Camera.CameraInfo();
+
+    private final PreviewInfo mPreviewInfo = new PreviewInfo();
+
+    private static class PreviewInfo {
+        SurfaceTexture surface;
+        int width;
+        int height;
+
+        void configure(SurfaceTexture s, int w, int h) {
+            surface = s;
+            width = w;
+            height = h;
+        }
+    }
+
+    private final TextureView.SurfaceTextureListener mSurfaceTextureListener
+            = new TextureView.SurfaceTextureListener() {
+
+        private boolean mUpdatedCalled;
+
+        @Override
+        public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
+            mPreviewInfo.configure(surface, width, height);
+            setUpPreview();
+        }
+
+        @Override
+        public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
+            mPreviewInfo.configure(surface, width, height);
+            setUpPreview();
+        }
+
+        @Override
+        public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
+            releaseCamera(); // Safe guard
+            return true;
+        }
+
+        @Override
+        public void onSurfaceTextureUpdated(SurfaceTexture surface) {
+            if (!mUpdatedCalled) {
+                mUpdatedCalled = true;
+            }
+        }
+    };
+
+    public Camera1(Context context) {
+        mContext = context;
+    }
+
+    @Override
+    TextureView.SurfaceTextureListener getSurfaceTextureListener() {
+        return mSurfaceTextureListener;
+    }
+
+    @Override
+    void onResume() {
+        chooseCamera();
+        openCamera();
+    }
+
+    @Override
+    void onPause() {
+        releaseCamera();
+    }
+
+    @Override
+    void startPreview() {
+        setUpPreview();
+        mCamera.startPreview();
+    }
+
+    private void setUpPreview() {
+        try {
+            mCamera.setPreviewTexture(mPreviewInfo.surface);
+            mCamera.setDisplayOrientation(calcDisplayOrientation());
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    void stopPreview() {
+        mCamera.stopPreview();
+    }
+
+    /**
+     * This rewrites {@link #mCameraId} and {@link #mCameraInfo}.
+     */
+    private void chooseCamera() {
+        for (int i = 0, count = Camera.getNumberOfCameras(); i < count; i++) {
+            Camera.getCameraInfo(i, mCameraInfo);
+            // TODO: Just choose the back-facing camera for now
+            if (mCameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
+                mCameraId = i;
+                return;
+            }
+        }
+        mCameraId = INVALID_CAMERA_ID;
+    }
+
+    private void openCamera() {
+        if (mCamera != null) {
+            releaseCamera();
+        }
+        mCamera = Camera.open(mCameraId);
+    }
+
+    private void releaseCamera() {
+        if (mCamera != null) {
+            mCamera.release();
+            mCamera = null;
+        }
+    }
+
+    private int calcDisplayOrientation() {
+        WindowManager manager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
+        int rotation = manager.getDefaultDisplay().getRotation();
+        int degrees = 0;
+        switch (rotation) {
+            case Surface.ROTATION_0:
+                degrees = 0;
+                break;
+            case Surface.ROTATION_90:
+                degrees = 90;
+                break;
+            case Surface.ROTATION_180:
+                degrees = 180;
+                break;
+            case Surface.ROTATION_270:
+                degrees = 270;
+                break;
+        }
+        if (mCameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
+            int result = (mCameraInfo.orientation + degrees) % 360;
+            return (360 - result) % 360;  // compensate the mirror
+        } else {  // back-facing
+            return (mCameraInfo.orientation - degrees + 360) % 360;
+        }
+    }
+
+}
diff --git a/library/src/main/java/com/google/android/cameraview/CameraView.java b/library/src/main/java/com/google/android/cameraview/CameraView.java
index 87939713..36784a55 100644
--- a/library/src/main/java/com/google/android/cameraview/CameraView.java
+++ b/library/src/main/java/com/google/android/cameraview/CameraView.java
@@ -16,12 +16,17 @@
 
 package com.google.android.cameraview;
 
+import android.app.Activity;
 import android.content.Context;
+import android.os.Build;
 import android.util.AttributeSet;
+import android.view.TextureView;
 import android.widget.FrameLayout;
 
 public class CameraView extends FrameLayout {
 
+    private final CameraViewImpl mImpl;
+
     public CameraView(Context context) {
         this(context, null);
     }
@@ -32,6 +37,36 @@ public CameraView(Context context, AttributeSet attrs) {
 
     public CameraView(Context context, AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
+        if (Build.VERSION.SDK_INT < 21) {
+            mImpl = new Camera1(context);
+        } else {
+            mImpl = new Camera1(context); // TODO: Implement Camera2 and replace this
+        }
+        inflate(context, R.layout.camera_view, this);
+        TextureView textureView = (TextureView) findViewById(R.id.texture_view);
+        textureView.setSurfaceTextureListener(mImpl.getSurfaceTextureListener());
+    }
+
+    /**
+     * This needs to be called from {@link Activity#onResume()}.
+     */
+    public void onResume() {
+        mImpl.onResume();
+    }
+
+    /**
+     * This needs to be called from {@link Activity#onPause()}.
+     */
+    public void onPause() {
+        mImpl.onPause();
+    }
+
+    public void startPreview() {
+        mImpl.startPreview();
+    }
+
+    public void stopPreview() {
+        mImpl.stopPreview();
     }
 
 }
diff --git a/library/src/main/res/layout/activity_camera_view.xml b/library/src/main/res/layout/activity_camera_view.xml
new file mode 100644
index 00000000..5f73bb49
--- /dev/null
+++ b/library/src/main/res/layout/activity_camera_view.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Copyright (C) 2016 The Android Open Source Project
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+         http://www.apache.org/licenses/LICENSE-2.0
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
+<FrameLayout android:id="@+id/container"
+             xmlns:android="http://schemas.android.com/apk/res/android"
+             android:layout_width="match_parent"
+             android:layout_height="match_parent">
+
+    <com.google.android.cameraview.CameraView
+        android:id="@+id/camera"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
+
+</FrameLayout>
diff --git a/library/src/main/res/layout/camera_view.xml b/library/src/main/res/layout/camera_view.xml
new file mode 100644
index 00000000..9f8edb83
--- /dev/null
+++ b/library/src/main/res/layout/camera_view.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Copyright (C) 2016 The Android Open Source Project
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+         http://www.apache.org/licenses/LICENSE-2.0
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
+<merge xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <TextureView
+        android:id="@+id/texture_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
+
+</merge>