Java 运行照相机服务时拍摄失败
我正在尝试在后台运行摄像头服务,服务启动后,我立即收到一个错误Java 运行照相机服务时拍摄失败,java,android,android-intent,android-camera,android-service,Java,Android,Android Intent,Android Camera,Android Service,我正在尝试在后台运行摄像头服务,服务启动后,我立即收到一个错误拍照失败。我不熟悉Android,不熟悉Stackoverflow,也不是一个好的程序员 我已经添加了正确的权限,并且该服务也已在清单文件中声明。 包com.example.nevii.camera import android.app.Service; import android.content.Intent; import android.hardware.Camera; import android.hardware.Came
拍照失败。我不熟悉Android,不熟悉Stackoverflow,也不是一个好的程序员
我已经添加了正确的权限,并且该服务也已在清单文件中声明。
包com.example.nevii.camera
import android.app.Service;
import android.content.Intent;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.IBinder;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.Toast;
import java.io.IOException;
public class CameraService extends Service
{
//Camera variables
//a surface holder
private SurfaceHolder sHolder;
//a variable to control the camera
private Camera mCamera;
//the camera parameters
private Parameters parameters;
private boolean safeToTakePicture = false;
/** Called when the activity is first created. */
@Override
public void onCreate()
{
super.onCreate();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// TODO Auto-generated method stub
super.onStartCommand(intent, flags, startId);
Toast.makeText(getBaseContext(), "onStartCommand", Toast.LENGTH_SHORT).show();
mCamera = Camera.open(1);
mCamera.setDisplayOrientation(90);
SurfaceView sv = new SurfaceView(getApplicationContext());
try {
mCamera.setPreviewDisplay(sv.getHolder());
parameters = mCamera.getParameters();
//set camera parameters
mCamera.setParameters(parameters);
mCamera.startPreview();
safeToTakePicture = true;
takePic();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
//stop the preview
mCamera.stopPreview();
mCamera.setPreviewCallback(null);
//release the camera
mCamera.release();
//unbind the camera from this object
mCamera = null;
}
//Get a surface
sHolder = sv.getHolder();
//tells Android that this surface will have its data constantly replaced
sHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
return START_STICKY;
}
public void takePic(){
Camera.PictureCallback mCall = new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
//decode the data obtained by the camera into a Bitmap
MyCamera myCamera = new MyCamera();
myCamera.SavePicture(data);
//stop the preview
mCamera.stopPreview();
mCamera.setPreviewCallback(null);
//release the camera
mCamera.release();
//unbind the camera from this object
mCamera = null;
}
};
mCamera.takePicture(null, null, mCall);
Toast.makeText(getApplicationContext(),"Pic taken",Toast.LENGTH_LONG).show();
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}
我从这里得到了源代码:
在MainActivity中,我使用以下命令启动服务:
startService(新的意图(这个,CameraService.class))代码>
myCamera.SavePicture
只是一个异步任务,用于保存图片,我认为这没有问题
我希望你们能帮助我
快乐编码
更新Logcat错误:
03-03 09:04:46.150 27530-27530/com.example.nevii.videocam D/Camera﹕ app passed NULL surface
03-03 09:04:46.153 27530-27530/com.example.nevii.videocam D/AndroidRuntime﹕ Shutting down VM
03-03 09:04:46.154 27530-27530/com.example.nevii.videocam E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.nevii.videocam, PID: 27530
java.lang.RuntimeException: Unable to start service com.example.nevii.videocam.CameraService@3f53f37f with Intent { cmp=com.example.nevii.videocam/.CameraService }: java.lang.RuntimeException: takePicture failed
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2881)
at android.app.ActivityThread.access$2100(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1376)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.RuntimeException: takePicture failed
at android.hardware.Camera.native_takePicture(Native Method)
at android.hardware.Camera.takePicture(Camera.java:1436)
at android.hardware.Camera.takePicture(Camera.java:1381)
at com.example.nevii.videocam.CameraService.takePic(CameraService.java:101)
at com.example.nevii.videocam.CameraService.onStartCommand(CameraService.java:57)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2864)
at android.app.ActivityThread.access$2100(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1376)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
只需添加SurfaceTexture st=新的SurfaceTexture(MODE_PRIVATE);mCamera.setPreviewTexture(st)代码>
在mCamera.startPreview()之前代码>请输入Logcat。Logcat是显示错误的控制台。我已经添加了Logcat错误。