尝试使用Android Camera2创建手电筒

概述我正在尝试使用Camera2创建一个手电筒.我收到了错误.当我试图打开或关闭手电筒时,我收到错误消息：android.hardware.camera2.CameraAccessExeption:Thecameradevicehasencounteredaseriouserror.主要活动packagecom.nettport.lommelykt;importandroid.Manifes

我正在尝试使用Camera2创建一个手电筒.我收到了错误.当我试图打开或关闭手电筒时,我收到错误消息：

android.harDWare.camera2.CameraAccessExeption: The camera device has
encountered a serIoUs error.

主要活动

package com.nettport.lommelykt;import androID.Manifest;import androID.content.pm.PackageManager;import androID.support.v4.app.ActivityCompat;import androID.support.v7.app.AppCompatActivity;import androID.os.Bundle;import androID.vIEw.VIEw;import androID.Widget.ImageVIEw;import androID.Widget.TextVIEw;import androID.Widget.Toast;import androID.Widget.Togglebutton;import androID.content.Context;import androID.graphics.SurfaceTexture;import androID.harDWare.camera2.CameraAccessException;import androID.harDWare.camera2.CameraCaptureSession;import androID.harDWare.camera2.Cameracharacteristics;import androID.harDWare.camera2.CameraDevice;import androID.harDWare.camera2.CameraManager;import androID.harDWare.camera2.CameraMetadata;import androID.harDWare.camera2.CaptureRequest;import androID.util.Size;import androID.vIEw.Surface;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    CameraManager cameraManager;    Cameracharacteristics cameracharacteristics;    CameraDevice mCameraDevice;    CameraCaptureSession mSession;    CaptureRequest.Builder mBuilder;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main);        // Initialize camera        initCamera();        // Click button on or off        Togglebutton onOffbutton = (Togglebutton) findVIEwByID(R.ID.togglebutton);        onOffbutton.setonClickListener(new VIEw.OnClickListener() {            @OverrIDe            public voID onClick(VIEw v) {                // your click actions go here                if (((Togglebutton) v).isChecked()) {                    changeTextAndIcon(1);                    turnOnFlashlight();                } else {                    changeTextAndIcon(0);                    turnOffFlashlight();                }            }        });    }    /*- Change text and icon ------------------------------------- */    // modus = 1 -> turn on    // modus = 0 -> turn off    voID changeTextAndIcon(int modus) {        // Change text        TextVIEw statusText = (TextVIEw) findVIEwByID(R.ID.textVIEw);        if (modus == 1) {            statusText.setText("Lommelykten er på"); // Flash  is on        } else {            statusText.setText("Lommelykten er av"); // Flash is off        }        // Change icon to off        ImageVIEw flashlightIcon = (ImageVIEw) findVIEwByID(R.ID.imageVIEw);        if (modus == 1) {            flashlightIcon.setimageResource(R.drawable.flashlight_on);        } else {            flashlightIcon.setimageResource(R.drawable.flashlight_off);        }    }    private voID initCamera() {        cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);        try {            String[] ID = cameraManager.getCameraIDList();            if (ID != null && ID.length > 0) {                cameracharacteristics = cameraManager.getCameracharacteristics(ID[0]);                boolean isFlash = cameracharacteristics.get(Cameracharacteristics.FLASH_INFO_AVAILABLE);                if (isFlash) {                    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {                        // Todo: ConsIDer calling                        //    ActivityCompat#requestPermissions                        // here to request the missing permissions, and then overrIDing                        //   public voID onRequestPermissionsResult(int requestCode, String[] permissions,                        //                                          int[] grantResults)                        // to handle the case where the user grants the permission. See the documentation                        // for ActivityCompat#requestPermissions for more details.                        return;                    }                    cameraManager.openCamera(ID[0], new MyCameraDeviceStateCallback(), null);                    Toast.makeText(this, "Camera initialized", Toast.LENGTH_LONG).show();                }            }        }        catch (CameraAccessException e)        {            e.printstacktrace();            Toast.makeText(this, "Camera initialization error:\n" + e.toString(), Toast.LENGTH_LONG).show();        }    }    class MyCameraDeviceStateCallback extends CameraDevice.StateCallback    {        @OverrIDe        public voID onopened(CameraDevice camera)        {            mCameraDevice = camera;            // get builder            try            {                mBuilder = camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);                List<Surface> List = new ArrayList<Surface>();                SurfaceTexture mSurfaceTexture = new SurfaceTexture(1);                Size size = getSmallestSize(mCameraDevice.getID());                mSurfaceTexture.setDefaultBufferSize(size.getWIDth(), size.getHeight());                Surface mSurface = new Surface(mSurfaceTexture);                List.add(mSurface);                mBuilder.addTarget(mSurface);                camera.createCaptureSession(List, new MyCameraCaptureSessionStateCallback(), null);            }            catch (CameraAccessException e)            {                e.printstacktrace();            }        }        @OverrIDe        public voID ondisconnected(CameraDevice camera)        {        }        @OverrIDe        public voID one rror(CameraDevice camera, int error)        {        }    }    private Size getSmallestSize(String cameraID) throws CameraAccessException    {        Size[] outputSizes = cameraManager.getCameracharacteristics(cameraID).get(Cameracharacteristics.SCALER_STREAM_CONfigURATION_MAP).getoutputSizes(SurfaceTexture.class);        if (outputSizes == null || outputSizes.length == 0)        {            throw new IllegalStateException("Camera " + cameraID + "doesn't support any outputSize.");        }        Size chosen = outputSizes[0];        for (Size s : outputSizes)        {            if (chosen.getWIDth() >= s.getWIDth() && chosen.getHeight() >= s.getHeight())            {                chosen = s;            }        }        return chosen;    }    class MyCameraCaptureSessionStateCallback extends CameraCaptureSession.StateCallback    {        @OverrIDe        public voID onConfigured(CameraCaptureSession session)        {            mSession = session;            try            {                mSession.setRepeatingRequest(mBuilder.build(), null, null);            }            catch (CameraAccessException e)            {                e.printstacktrace();            }        }        @OverrIDe        public voID onConfigureFailed(CameraCaptureSession session)        {        }    }    public voID turnOnFlashlight()    {        try        {            mBuilder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_TORCH);            mSession.setRepeatingRequest(mBuilder.build(), null, null);            Toast.makeText(this, "Flash activated", Toast.LENGTH_LONG).show();        }        catch (Exception e)        {            e.printstacktrace();            Toast.makeText(this, "Flash Failed:\n" + e.toString(), Toast.LENGTH_LONG).show();        }    }    public voID turnOffFlashlight()    {        try        {            mBuilder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_OFF);            mSession.setRepeatingRequest(mBuilder.build(), null, null);            Toast.makeText(this, "Flash Disabled", Toast.LENGTH_LONG).show();        }        catch (Exception e)        {            e.printstacktrace();            Toast.makeText(this, "Flash Failed:\n" + e.toString(), Toast.LENGTH_LONG).show();        }    }    private voID close()    {        Toast.makeText(this, "Camera closed", Toast.LENGTH_LONG).show();        if (mCameraDevice == null || mSession == null)        {            return;        }        mSession.close();        mCameraDevice.close();        mCameraDevice = null;        mSession = null;    }}

AndroIDManifest

<?xml version="1.0" enCoding="utf-8"?><manifest xmlns:androID="http://schemas.androID.com/apk/res/androID"    package="com.nettport.lommelykt">    <application        androID:allowBackup="true"        androID:icon="@mipmap/ic_launcher"        androID:label="@string/app_name"        androID:supportsRtl="true"        androID:theme="@style/Apptheme"        >        <activity androID:name=".MainActivity">            <intent-filter>                <action androID:name="androID.intent.action.MAIN" />                <category androID:name="androID.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application>    <!-- Allows access to the flashlight -->    <uses-permission androID:name="androID.permission.CAMERA" />    <uses-permission androID:name="androID.permission.FLASHliGHT" />    <uses-feature androID:name="androID.harDWare.camera" />    <uses-feature androID:name="androID.harDWare.camera.autofocus" />    <uses-feature androID:name="androID.harDWare.camera.flash" /></manifest>

解决方法:

你没有坚持你的SurfaceTexture;从它创建的Surface大致等于弱指针,并且不会使SurfaceTexture不被垃圾收集.

查看在MainActivity中存储SurfaceTexture是否可以解决您的问题.
如果没有,您将需要提供崩溃的logcat(不仅仅是应用程序日志记录,整个系统),以更详细地查看相机服务正在抱怨的内容.

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