我正在开发相机 API。它在 4.0 和 4.1 中完美运行，但是当我在 Android 2.3 或更低版本的设备上尝试它时，它在 surfacechanged 功能中崩溃。我正在使用前置摄像头拍照。这是我的日志：
11-03 03:37:11.756: E/AndroidRuntime(11316): FATAL EXCEPTION: main
11-03 03:37:11.756: E/AndroidRuntime(11316): java.lang.RuntimeException: startPreview failed
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.hardware.Camera.startPreview(Native Method)
11-03 03:37:11.756: E/AndroidRuntime(11316): at com.test.CameraSurfaceView.surfaceChanged(CameraSurfaceView.java:42)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.SurfaceView.updateWindow(SurfaceView.java:557)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.SurfaceView.dispatchDraw(SurfaceView.java:348)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.ViewGroup.drawChild(ViewGroup.java:1730)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1459)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.ViewGroup.drawChild(ViewGroup.java:1730)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1459)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.View.draw(View.java:6988)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.ViewGroup.drawChild(ViewGroup.java:1732)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1459)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.View.draw(View.java:6988)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.widget.FrameLayout.draw(FrameLayout.java:357)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.ViewGroup.drawChild(ViewGroup.java:1732)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1459)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.ViewGroup.drawChild(ViewGroup.java:1730)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1459)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.View.draw(View.java:6988)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.widget.FrameLayout.draw(FrameLayout.java:357)
11-03 03:37:11.756: E/AndroidRuntime(11316): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1993)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.ViewRoot.draw(ViewRoot.java:1614)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.ViewRoot.performTraversals(ViewRoot.java:1335)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.view.ViewRoot.handleMessage(ViewRoot.java:1973)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.os.Handler.dispatchMessage(Handler.java:99)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.os.Looper.loop(Looper.java:150)
11-03 03:37:11.756: E/AndroidRuntime(11316): at android.app.ActivityThread.main(ActivityThread.java:4293)
11-03 03:37:11.756: E/AndroidRuntime(11316): at java.lang.reflect.Method.invokeNative(Native Method)
11-03 03:37:11.756: E/AndroidRuntime(11316): at java.lang.reflect.Method.invoke(Method.java:507)
11-03 03:37:11.756: E/AndroidRuntime(11316): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
11-03 03:37:11.756: E/AndroidRuntime(11316): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
11-03 03:37:11.756: E/AndroidRuntime(11316): at dalvik.system.NativeStart.main(Native Method)
这是我的代码：
class CameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback {
Camera camera;
private int cameraId = 0;
CameraSurfaceView(Context context) {
super(context);
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
SurfaceHolder holder = this.getHolder();
holder.addCallback(this);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// The default orientation is landscape, so for a portrait app like this
// one we need to rotate the view 90 degrees.
// camera.setDisplayOrientation(90);
// IMPORTANT: We must call startPreview() on the camera before we take
// any pictures
// camera.startPreview();
// camera.setParameters(parameters);
camera.startPreview();
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
// Open the Camera in preview mode
// cameraId = findFrontFacingCamera();
this.camera = Camera.open(cameraId);
this.camera.setPreviewDisplay(holder);
} catch (IOException ioe) {
ioe.printStackTrace(System.out);
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// Surface will be destroyed when replaced with a new screen
// Always make sure to release the Camera instance
camera.stopPreview();
camera.release();
camera = null;
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
// TODO Auto-generated method stub
}
public void takePicture(PictureCallback imageCallback) {
camera.takePicture(null, null, imageCallback);
}
private int findFrontFacingCamera() {
int cameraId = -1;
// Search for the front facing camera
int numberOfCameras = Camera.getNumberOfCameras();
for (int i = 0; i < numberOfCameras; i++) {
CameraInfo info = new CameraInfo();
Camera.getCameraInfo(i, info);
if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
Log.e("Found", "Camera found");
cameraId = i;
break;
}
}
return cameraId;
}
}