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android - MediaRecorder - 固件升级后代码停止工作

转载 作者:塔克拉玛干 更新时间:2023-11-02 22:58:33 25 4
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我有一个在 android 2.2 上运行的 samsung galaxy 选项卡。我开发了一个简单的程序来分别录制音频和视频。它在我的 galaxy 选项卡上运行良好。但是,在我升级到 android 2.3.3 后,一切都变了。从那一刻起,我的代码就停止工作了。这是我的代码,它显示了这种意外的(对我来说 :))行为:

// import statements

public class CameraPreview extends Activity implements SurfaceHolder.Callback {
Camera camera;
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
boolean previewing = false;
LayoutInflater controlInflater = null;
Button recordButton;

/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.camera);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

getWindow().setFormat(PixelFormat.UNKNOWN);
surfaceView = (SurfaceView) findViewById(R.id.camerapreview);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

controlInflater = LayoutInflater.from(getBaseContext());
View viewControl = controlInflater.inflate(R.layout.control, null);
LayoutParams layoutParamsControl = new LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
this.addContentView(viewControl, layoutParamsControl);

recordButton = (Button)viewControl.findViewById(R.id.start_recording);
recordButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startRecording();
}
});

}

public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
if (previewing) {
camera.stopPreview();
previewing = false;
}

if (camera != null) {
try {
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
previewing = true;
} catch (IOException e) {
e.printStackTrace();
}
}
}

public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
}

public void surfaceDestroyed(SurfaceHolder holder) {
camera.stopPreview();
camera.release();
camera = null;
previewing = false;
}

private void startRecording() {
try {
stopPreview();

Thread video = new Thread(new Runnable() {
public void run() {
videoRecorder = new MediaRecorder();
videoRecorder.setPreviewDisplay(surfaceView.getHolder().getSurface());
videoRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
videoRecorder.setOutputFormat(2);
videoRecorder.setVideoEncodingBitRate(56 * 8 * 1024);
videoRecorder.setVideoSize(176, 144);
videoRecorder.setVideoFrameRate(12);
videoRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
videoRecorder.setOutputFile("/sdcard/video.m4e");
try {
videoRecorder.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
videoRecorder.start();
}
});
video.start();

Thread audio = new Thread(new Runnable() {
public void run() {
audioRecorder = new MediaRecorder();
audioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
audioRecorder.setOutputFormat(MediaRecorder.OutputFormat.RAW_AMR);
audioRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
audioRecorder.setOutputFile("/sdcard/audio.amr");
try {
audioRecorder.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
audioRecorder.start();
}
});
audio.start();
} catch (Exception e) {
Log.e("streamer", "Unable to start recording", e);
}
}

private void stopPreview() {
if (camera == null) {
throw new RuntimeException();
}
camera.stopPreview();
camera.release();
camera = null;
}
}

日志输出如下:

     PID     TAG                MESSAGE

D 75 CameraHardwareSec MemoryHeapBase(fd(27), size(5760128), width(800), height(600))
E 75 AuthorDriver Command 13 completed with error -17
E 7169 MediaRecorder prepare failed: -17
W 7169 System.err java.io.IOException: prepare failed.
W 7169 System.err at android.media.MediaRecorder._prepare(Native Method)
W 7169 System.err at android.media.MediaRecorder.prepare(MediaRecorder.java:592)
W 7169 System.err at com.video.streamer.view.CameraPreview$2.run(CameraPreview.java:121)
W 7169 System.err at java.lang.Thread.run(Thread.java:1019)
E 7169 MediaRecorder start called in an invalid state: 0
W 7169 dalvikvm threadid=10: thread exiting with uncaught exception (group=0x40015578)
E 7169 AndroidRuntime FATAL EXCEPTION: Thread-11
E 7169 AndroidRuntime java.lang.IllegalStateException
E 7169 AndroidRuntime at android.media.MediaRecorder.start(Native Method)
E 7169 AndroidRuntime at com.video.streamer.view.CameraPreview$2.run(CameraPreview.java:127)
E 7169 AndroidRuntime at java.lang.Thread.run(Thread.java:1019)
W 118 ActivityManager Force finishing activity com.video.streamer.view/.CameraPreview

以下是我用于布局目的的 XML 文件。相机.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<SurfaceView
android:id="@+id/camerapreview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>

控制.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="bottom"
>
<Button
android:id="@+id/start_recording"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" * Start Recording"
android:layout_gravity="right"
android:layout_margin="10px"
/>
</LinearLayout>

我在 AndroidManifest.xml 上使用了以下权限

<uses-permission android:name="android.permission.CAMERA"></uses-permission>
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

我从 roman10 家伙的博客上得到的一个视频录制示例:Android Video Recording API–Illustrated with an Example也适用于我的 android 2.2。但是,由于我的升级,它也停止工作了。

使用 android 2.3.3 录制视频时,我是否遗漏了什么。我该如何解决这个问题?

最佳答案

Android SDK 不断更改其 API,因此当您对路径进行硬编码时会出现问题:

videoRecorder.setOutputFile("/sdcard/video.m4e");//or
audioRecorder.setOutputFile("/sdcard/audio.amr");

如果 API 更改目录,您的应用程序将被破坏。获取文件路径的更好方法是使用 API 函数:

mVideoFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
mVideoFileName += "/video.m4e";

mAudioFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
mAudioFileName += "/audio.amr";

关于android - MediaRecorder - 固件升级后代码停止工作,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9122659/

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