119 lines
3.9 KiB
Plaintext
119 lines
3.9 KiB
Plaintext
page.title=Recording Videos Simply
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parent.title=Capturing Photos
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parent.link=index.html
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trainingnavtop=true
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previous.title=Recording Photos Simply
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previous.link=photobasics.html
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next.title=Controlling the Camera
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next.link=cameradirect.html
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@jd:body
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<div id="tb-wrapper">
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<div id="tb">
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<h2>This lesson teaches you to</h2>
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<ol>
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<li><a href="#TaskManifest">Request Camera Permission</a></li>
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<li><a href="#TaskCaptureIntent">Record a Video with a Camera App</a>
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<li><a href="#TaskVideoView">View the Video</a></li>
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</ol>
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<h2>You should also read</h2>
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<ul>
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<li><a href="{@docRoot}guide/topics/media/camera.html">Camera</a></li>
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<li><a href="{@docRoot}guide/components/intents-filters.html">Intents and Intent
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Filters</a></li>
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</ul>
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<h2>Try it out</h2>
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<div class="download-box">
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<a href="http://developer.android.com/shareables/training/PhotoIntentActivity.zip"
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class="button">Download the sample</a>
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<p class="filename">PhotoIntentActivity.zip</p>
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</div>
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</div>
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</div>
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<p>This lesson explains how to capture video using existing camera
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applications.</p>
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<p>Your application has a job to do, and integrating videos is only a small
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part of it. You want to take videos with minimal fuss, and not reinvent the
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camcorder. Happily, most Android-powered devices already have a camera application that
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records video. In this lesson, you make it do this for you.</p>
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<h2 id="TaskManifest">Request Camera Permission</h2>
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<p>To advertise that your application depends on having a camera, put a
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{@code <uses-feature>} tag in the manifest file:</p>
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<pre>
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<manifest ... >
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<uses-feature android:name="android.hardware.camera" />
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...
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</manifest ... >
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</pre>
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<p>If your application uses, but does not require a camera in order to function, add {@code
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android:required="false"} to the tag. In doing so, Google Play will allow devices without a
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camera to download your application. It's then your responsibility to check for the availability
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of the camera at runtime by calling {@link
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android.content.pm.PackageManager#hasSystemFeature hasSystemFeature(PackageManager.FEATURE_CAMERA)}.
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If a camera is not available, you should then disable your camera features.</p>
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<h2 id="TaskCaptureIntent">Record a Video with a Camera App</h2>
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<p>The Android way of delegating actions to other applications is to invoke
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an {@link android.content.Intent} that describes what you want done. This
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involves three pieces: the {@link android.content.Intent} itself, a call to start the external
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{@link android.app.Activity}, and some code to handle the video when focus returns
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to your activity.</p>
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<p>Here's a function that invokes an intent to capture video.</p>
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<pre>
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private void dispatchTakeVideoIntent() {
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Intent takeVideoIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
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startActivityForResult(takeVideoIntent, ACTION_TAKE_VIDEO);
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}
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</pre>
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<p>It's a good idea to make sure an app exists to handle your intent
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before invoking it. Here's a function that checks for apps that can handle your intent:</p>
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<pre>
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public static boolean isIntentAvailable(Context context, String action) {
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final PackageManager packageManager = context.getPackageManager();
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final Intent intent = new Intent(action);
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List<ResolveInfo> list =
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packageManager.queryIntentActivities(intent,
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PackageManager.MATCH_DEFAULT_ONLY);
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return list.size() > 0;
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}
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</pre>
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<h2 id="TaskVideoView">View the Video</h2>
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<p>The Android Camera application returns the video in the {@link android.content.Intent} delivered
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to {@link android.app.Activity#onActivityResult onActivityResult()} as a {@link
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android.net.Uri} pointing to the video location in storage. The following code
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retrieves this video and displays it in a {@link android.widget.VideoView}.</p>
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<pre>
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private void handleCameraVideo(Intent intent) {
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mVideoUri = intent.getData();
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mVideoView.setVideoURI(mVideoUri);
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}
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</pre>
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