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98 lines
4.2 KiB
98 lines
4.2 KiB
<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Copyright 2014 The Android Open Source Project
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<sample>
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<name>Camera2Video</name>
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<group>Media</group>
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<package>com.example.android.camera2video</package>
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<minSdk>21</minSdk>
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<strings>
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<intro>
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<![CDATA[
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This sample demonstrates how to record video using Camera2 API.
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]]>
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</intro>
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</strings>
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<template src="base"/>
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<metadata>
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<status>PUBLISHED</status>
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<categories>Media</categories>
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<technologies>Android</technologies>
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<languages>Java</languages>
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<solutions>Mobile</solutions>
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<level>ADVANCED</level>
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<icon>screenshots/icon-web.png</icon>
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<screenshots>
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<img>screenshots/1-launch.png</img>
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<img>screenshots/2-record.png</img>
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<img>screenshots/3-save.png</img>
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</screenshots>
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<api_refs>
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<android>android.hardware.camera2.CameraCaptureSession</android>
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<android>android.hardware.camera2.CameraDevice</android>
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<android>android.view.TextureView</android>
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</api_refs>
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<description>
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<![CDATA[
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This sample shows how to record video using the new Camera2 API in Android Lollipop.
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]]>
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</description>
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<intro>
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<![CDATA[
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Android Lollipop introduced a new camera API, called camera2. This sample uses [CameraDevice][1]
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and [CameraCaptureSession][2] to record video. It also uses a custom [TextureView][3] to render the output.
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The main steps are:
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1. Create a custom TextureView class and add it to the layout. The purpose of the custom TextureView is
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to be able to draw itself according to an aspect ratio, which is set via a public method. Additionally,
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the `onMeasure(int widthMeasureSpec, int heightMeasureSpec)` method is overridden, using the aspect ratio.
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2. Implement a `TextureView.SurfaceTextureListener` on your TextureView, and override its
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`onSurfaceTextureSizeChanged(SurfaceTexture surfaceTexture, int width, int height)` method to calculate
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the matrix to apply to the TextureView so the camera output fits. Use the method `setTransform(matrix)` on
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the TextureView.
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3. Implement a [`CameraDevice.StateCallback`][4] to receive events about changes of the state of the
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camera device. Override its methods to set your CameraDevice instance, start the preview, and stop
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and release the camera.
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4. When starting the preview, set up the MediaRecorder to accept video format.
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5. Then, set up a [`CaptureRequest.Builder`][5] using `createCaptureRequest(CameraDevice.TEMPLATE_RECORD)`
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on your CameraDevice instance.
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6. Then, implement a [`CameraCaptureSession.StateCallback`][6], using the method
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`createCaptureSession(surfaces, new CameraCaptureSession.StateCallback(){})` on your CameraDevice instance,
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where `surfaces` is a list consisting of the surface view of your TextureView and the surface of
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your MediaRecorder instance.
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7. Use `start()` and `stop()` methods on your MediaRecorder instance to actually start and stop the recording.
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8. Lastly, set up and clean up your camera device in `onResume()` and `onPause()`.
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[1]: https://developer.android.com/reference/android/hardware/camera2/CameraDevice.html
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[2]: http://developer.android.com/reference/android/hardware/camera2/CameraCaptureSession.html
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[3]: http://developer.android.com/reference/android/view/TextureView.html
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[4]: https://developer.android.com/reference/android/hardware/camera2/CameraDevice.StateCallback.html
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[5]: http://developer.android.com/reference/android/hardware/camera2/CaptureRequest.Builder.html
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[6]: http://developer.android.com/reference/android/hardware/camera2/CameraCaptureSession.StateCallback.html
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]]>
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</intro>
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</metadata>
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</sample>
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