android.hardware.camera2.CameraAccessException: CAMERA_DISCONNECTED (2): 相机设备已断开连接
创始人
2024-08-20 02:00:07
0

在处理相机相关操作时,可能会遇到“android.hardware.camera2.CameraAccessException: CAMERA_DISCONNECTED (2): 相机设备已断开连接”异常。这个异常表示相机设备在操作时已经断开连接。下面是一个示例的解决方法:

import android.Manifest;
import android.content.pm.PackageManager;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCaptureSession;
import android.hardware.camera2.CameraDevice;
import android.hardware.camera2.CameraManager;
import android.os.Bundle;
import android.util.Log;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import java.util.Collections;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "CameraExample";
    private static final int REQUEST_CAMERA_PERMISSION = 200;

    private SurfaceView surfaceView;
    private CameraManager cameraManager;
    private String cameraId;
    private CameraDevice cameraDevice;
    private CameraCaptureSession cameraCaptureSession;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        surfaceView = findViewById(R.id.surfaceView);
        cameraManager = (CameraManager) getSystemService(CAMERA_SERVICE);

        // 检查相机权限
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA_PERMISSION);
        } else {
            openCamera();
        }

        surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(@NonNull SurfaceHolder surfaceHolder) {
                // 创建 Surface 后,重新打开相机
                if (cameraDevice != null) {
                    closeCamera();
                }
                openCamera();
            }

            @Override
            public void surfaceChanged(@NonNull SurfaceHolder surfaceHolder, int i, int i1, int i2) {
                // Surface 发生变化时,重新配置相机
                configureCamera();
            }

            @Override
            public void surfaceDestroyed(@NonNull SurfaceHolder surfaceHolder) {
                // 销毁 Surface 时,关闭相机
                closeCamera();
            }
        });
    }

    private void openCamera() {
        try {
            cameraId = cameraManager.getCameraIdList()[0];
            cameraManager.openCamera(cameraId, new CameraDevice.StateCallback() {
                @Override
                public void onOpened(@NonNull CameraDevice cameraDevice) {
                    MainActivity.this.cameraDevice = cameraDevice;
                    configureCamera();
                }

                @Override
                public void onDisconnected(@NonNull CameraDevice cameraDevice) {
                    cameraDevice.close();
                    MainActivity.this.cameraDevice = null;
                }

                @Override
                public void onError(@NonNull CameraDevice cameraDevice, int i) {
                    cameraDevice.close();
                    MainActivity.this.cameraDevice = null;
                }
            }, null);
        } catch (CameraAccessException e) {
            Log.e(TAG, "相机访问异常: " + e.getMessage());
        }
    }

    private void closeCamera() {
        if (cameraCaptureSession != null) {
            cameraCaptureSession.close();
            cameraCaptureSession = null;
        }

        if (cameraDevice != null) {
            cameraDevice.close();
            cameraDevice = null;
        }
    }

    private void configureCamera() {
        if (cameraDevice == null) {
            return;
        }

        try {
            Surface surface = surfaceView.getHolder().getSurface();
            cameraDevice.createCaptureSession(Collections.singletonList(surface), new CameraCaptureSession.StateCallback() {
                @Override
                public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
                    MainActivity.this.cameraCaptureSession = cameraCaptureSession;
                }

                @Override
                public void onConfigureFailed(@NonNull CameraCaptureSession cameraCaptureSession) {
                    Log.e(TAG, "相机配置失败");
                }
            }, null);
        } catch (CameraAccessException e) {
            Log.e(TAG, "相机访问异常: " + e.getMessage());
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (requestCode == REQUEST_CAMERA_PERMISSION) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                openCamera();
            } else {
                Log.e(TAG, "相机权限被拒绝");
            }
        }
    }
}

在上面的示例代码中,我们使用了CameraManager来获取相机设备,并通过cameraManager.openCamera()方法来打开相机。

相关内容

热门资讯

记者揭秘!智星菠萝辅助(透视辅... 记者揭秘!智星菠萝辅助(透视辅助)拱趴大菠萝辅助神器,扑克教程(有挂细节);模式供您选择,了解更新找...
一分钟揭秘!约局吧能能开挂(透... 一分钟揭秘!约局吧能能开挂(透视辅助)hhpoker辅助靠谱,2024新版教程(有挂教学);约局吧能...
透视辅助!wepoker模拟器... 透视辅助!wepoker模拟器哪个好用(脚本)hhpoker辅助挂是真的,科技教程(有挂技巧);囊括...
透视代打!hhpkoer辅助器... 透视代打!hhpkoer辅助器视频(辅助挂)pokemmo脚本辅助,2024新版教程(有挂教程);风...
透视了解!约局吧德州真的有透视... 透视了解!约局吧德州真的有透视挂(透视脚本)德州局HHpoker透视脚本,必胜教程(有挂分析);亲,...
六分钟了解!wepoker挂底... 六分钟了解!wepoker挂底牌(透视)德普之星开辅助,详细教程(有挂解密);德普之星开辅助是一种具...
9分钟了解!wpk私人辅助(透... 9分钟了解!wpk私人辅助(透视)hhpoker德州透视,插件教程(有挂教学);风靡全球的特色经典游...
推荐一款!wepoker究竟有... 推荐一款!wepoker究竟有透视(脚本)哈糖大菠萝开挂,介绍教程(有挂技术);囊括全国各种wepo...
每日必备!wepoker有人用... 每日必备!wepoker有人用过(脚本)wpk有那种辅助,线上教程(有挂规律);wepoker有人用...
玩家必备教程!wejoker私... 玩家必备教程!wejoker私人辅助软件(脚本)哈糖大菠萝可以开挂,可靠技巧(有挂神器)申哈糖大菠萝...