我有一個在android 2.2上運行的galaxy galaxy選項卡。我開發了一個簡單的程序來分別記錄音頻和視頻。它在我的星系標籤上工作正常。但是,升級到android 2.3.3後,所有內容都改變了。從那時起,我的代碼停止工作。這裏是我的代碼,該代碼顯示(對我:))行爲這個意外:MediaRecorder - 固件升級後代碼停止工作
// 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;
}
}
以下是日誌輸出:
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
以下用於佈局的目的,我的XML文件。 camera.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>
control.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>
我用AndroidManifest.xml
<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"/>
視頻錄製的例子,我從roman10傢伙博客得到了以下權限:Android Video Recording API–Illustrated with an Example還在努力罰款與我的android 2.2。但是,由於我的升級,這也停止了工作。
使用android 2.3.3錄製視頻時有什麼不足之處嗎?我怎麼解決這個問題?
我有同樣的問題。 – lukewm 2012-02-06 21:47:08