2
我找到了一些教程來使用相機。模擬器上沒有錯誤，但它在設備上崩潰，爲什麼？我只是創建簡單的代碼來預覽圖片。相機無法在Android設備上工作
我測試該設備是HTC野火的Android 2.2
Mainclass
private Camera camera;
private boolean isPreviewRunning = false;
private SimpleDateFormat timeStampFormat = new SimpleDateFormat("yyyyMMddHHmmssSS");
private SurfaceView surfaceView;
private SurfaceHolder surfaceHolder;
public void onCreate(Bundle icicle)
{
super.onCreate(icicle);
Log.e(getClass().getSimpleName(), "onCreate");
getWindow().setFormat(PixelFormat.TRANSLUCENT);
setContentView(R.layout.main);
surfaceView = (SurfaceView)findViewById(R.id.surface);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState)
{
super.onRestoreInstanceState(savedInstanceState);
}
Camera.PictureCallback mPictureCallbackRaw = new Camera.PictureCallback()
{
public void onPictureTaken(byte[] data, Camera c)
{
Log.e(getClass().getSimpleName(), "PICTURE CALLBACK RAW: " + data);
camera.startPreview();
}
};
Camera.PictureCallback mPictureCallbackJpeg= new Camera.PictureCallback()
{
public void onPictureTaken(byte[] data, Camera c)
{
Log.e(getClass().getSimpleName(), "PICTURE CALLBACK JPEG: data.length = " + data);
}
};
Camera.ShutterCallback mShutterCallback = new Camera.ShutterCallback()
{
public void onShutter()
{
Log.e(getClass().getSimpleName(), "SHUTTER CALLBACK");
}
};
public boolean onKeyDown(int keyCode, KeyEvent event)
{
ImageCaptureCallback iccb = null;
if(keyCode == KeyEvent.KEYCODE_DPAD_CENTER)
{
try
{
String filename = timeStampFormat.format(new Date());
ContentValues values = new ContentValues();
values.put(Media.TITLE, filename);
values.put(Media.DESCRIPTION, "Image capture by camera");
Uri uri = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, values);
//String filename = timeStampFormat.format(new Date());
iccb = new ImageCaptureCallback(getContentResolver().openOutputStream(uri));
}
catch(Exception ex)
{
ex.printStackTrace();
Log.e(getClass().getSimpleName(), ex.getMessage(), ex);
}
}
if (keyCode == KeyEvent.KEYCODE_BACK)
{
return super.onKeyDown(keyCode, event);
}
if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER)
{
camera.takePicture(mShutterCallback, mPictureCallbackRaw, iccb);
return true;
}
return false;
}
protected void onResume()
{
Log.e(getClass().getSimpleName(), "onResume");
super.onResume();
}
protected void onSaveInstanceState(Bundle outState)
{
super.onSaveInstanceState(outState);
}
protected void onStop()
{
Log.e(getClass().getSimpleName(), "onStop");
super.onStop();
}
public void surfaceCreated(SurfaceHolder holder)
{
Log.e(getClass().getSimpleName(), "surfaceCreated");
camera = Camera.open();
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h)
{
Log.e(getClass().getSimpleName(), "surfaceChanged");
if (isPreviewRunning)
{
camera.stopPreview();
}
Camera.Parameters p = camera.getParameters();
p.setPreviewSize(w, h);
camera.setParameters(p);
try
{
camera.setPreviewDisplay(holder);
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
camera.startPreview();
isPreviewRunning = true;
}
public void surfaceDestroyed(SurfaceHolder holder)
{
Log.e(getClass().getSimpleName(), "surfaceDestroyed");
camera.stopPreview();
isPreviewRunning = false;
camera.release();
}
}
ImageCaptureCallBack
private OutputStream filoutputStream;
public ImageCaptureCallback(OutputStream filoutputStream)
{
this.filoutputStream = filoutputStream;
}
@Override
public void onPictureTaken(byte[] data, Camera camera)
{
try
{
Log.v(getClass().getSimpleName(), "onPictureTaken=" + data + " length = " + data.length);
filoutputStream.write(data);
filoutputStream.flush();
filoutputStream.close();
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
}
和清單
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.photo.test"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name=".Main" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
在那裏它會崩潰，附加logcat的輸出 –
林整個上午並沒有什麼想，什麼是最簡單的例子代碼讓相機的預覽和設備上顯示呢？ – goodm
請附上logcat的詳細信息。 –