运行低于Lollipop的设备上的CameraManager

我遇到的问题是我同时使用Camera（低于Lollipop设备）和CameraManager类（Lollipop及以上设备）。

运行低于棒棒糖的设备崩溃，我相信这是因为

import android.hardware.camera2.CameraManager; 

部分。 我怎么能做到这一点

 package com.example.DeviceCommands; import android.annotation.TargetApi; import android.content.Context; import android.content.pm.PackageManager; import android.hardware.Camera; import android.hardware.Camera.AutoFocusCallback; import android.hardware.Camera.Parameters; import android.hardware.camera2.CameraAccessException; import android.hardware.camera2.CameraManager; import android.os.Build; public class FlashController { Context _context; boolean _is_supported = false; boolean _enabled = false; Object _camera; @TargetApi(Build.VERSION_CODES.L) public FlashController(Context context) { if (context.getPackageManager().hasSystemFeature(PackageManager .FEATURE_CAMERA_FLASH)) { _context = context; _is_supported = true; if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.LOLLIPOP) { Camera camera = Camera.open(); if (camera == null) { _is_supported = false; System.out.println("NOT SUPPORTED!"); return; } _camera = camera; } else { CameraManager camera = (CameraManager) _context.getSystemService(Context.CAMERA_SERVICE); _camera = camera; } } } @TargetApi(Build.VERSION_CODES.L) public void enableFlashLight() { if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.LOLLIPOP) { Camera camera = (Camera) _camera; Camera.Parameters parameters = camera.getParameters(); if(!parameters.getFlashMode().equals(android.hardware .Camera.Parameters.FLASH_MODE_TORCH) && !_enabled) { Parameters params = camera.getParameters(); params.setFlashMode(Parameters.FLASH_MODE_TORCH); camera.setParameters(params); camera.startPreview(); _enabled = true; camera.autoFocus(new AutoFocusCallback() { public void onAutoFocus(boolean success, Camera camera) { } }); } } else { //CameraManager manager =(CameraManager) _context.getSystemService(Context.CAMERA_SERVICE); try { CameraManager camera = (CameraManager) _camera; for(int i = 0; i < camera.getCameraIdList().length; i++) { System.out.println("Camera=" + camera.getCameraCharacteristics( camera.getCameraIdList()[i])); } } catch (CameraAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } public void disableFlashLight() { if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.LOLLIPOP) { Camera cam = Camera.open(); Camera.Parameters parameters = cam.getParameters(); if(parameters.getFlashMode().equals(android.hardware .Camera.Parameters.FLASH_MODE_TORCH)) { parameters.setFlashMode(Parameters.FLASH_MODE_OFF); cam.setParameters(parameters); cam.release(); } } } } 

如果import部分会使设备运行低于Lollipop崩溃？

感谢您的帮助和建议！

编辑：上面添加了全class。 Logcat输出

 06-09 19:44:30.219: E/ViewRootImpl(956): sendUserActionEvent() mView == null 06-09 19:44:31.360: E/dalvikvm(956): Could not find class 'android.hardware.camera2.CameraManager', referenced from method com.example.DeviceCommands.FlashController. 06-09 19:44:31.360: W/dalvikvm(956): VFY: unable to resolve check-cast 122 (Landroid/hardware/camera2/CameraManager;) in Lcom/example/DeviceCommands/FlashController; 06-09 19:44:31.360: D/dalvikvm(956): VFY: replacing opcode 0x1f at 0x003a 06-09 19:44:31.367: E/dalvikvm(956): Could not find class 'android.hardware.camera2.CameraManager', referenced from method com.example.DeviceCommands.FlashController.enableFlashLight 06-09 19:44:31.367: W/dalvikvm(956): VFY: unable to resolve check-cast 122 (Landroid/hardware/camera2/CameraManager;) in Lcom/example/DeviceCommands/FlashController; 06-09 19:44:31.367: D/dalvikvm(956): VFY: replacing opcode 0x1f at 0x0040 06-09 19:44:31.367: W/dalvikvm(956): VFY: unable to resolve exception class 120 (Landroid/hardware/camera2/CameraAccessException;) 06-09 19:44:31.367: W/dalvikvm(956): VFY: unable to find exception handler at addr 0x6b 06-09 19:44:31.367: W/dalvikvm(956): VFY: rejected Lcom/example/DeviceCommands/FlashController;.enableFlashLight ()V 06-09 19:44:31.367: W/dalvikvm(956): VFY: rejecting opcode 0x0d at 0x006b 06-09 19:44:31.367: W/dalvikvm(956): VFY: rejected Lcom/example/DeviceCommands/FlashController;.enableFlashLight ()V 06-09 19:44:31.367: W/dalvikvm(956): Verifier rejected class Lcom/example/DeviceCommands/FlashController; 06-09 19:44:31.367: D/AndroidRuntime(956): Shutting down VM 06-09 19:44:31.367: W/dalvikvm(956): threadid=1: thread exiting with uncaught exception (group=0x4100d930) 06-09 19:44:31.375: E/AndroidRuntime(956): FATAL EXCEPTION: main 06-09 19:44:31.375: E/AndroidRuntime(956): java.lang.VerifyError: com/example/DeviceCommands/FlashController 06-09 19:44:31.375: E/AndroidRuntime(956): at com.example.babymonitorer.MainActivity.onClick(MainActivity.java:121) 06-09 19:44:31.375: E/AndroidRuntime(956): at android.view.View.performClick(View.java:4421) 06-09 19:44:31.375: E/AndroidRuntime(956): at android.view.View$PerformClick.run(View.java:18190) 06-09 19:44:31.375: E/AndroidRuntime(956): at android.os.Handler.handleCallback(Handler.java:725) 06-09 19:44:31.375: E/AndroidRuntime(956): at android.os.Handler.dispatchMessage(Handler.java:92) 06-09 19:44:31.375: E/AndroidRuntime(956): at android.os.Looper.loop(Looper.java:175) 06-09 19:44:31.375: E/AndroidRuntime(956): at android.app.ActivityThread.main(ActivityThread.java:5279) 06-09 19:44:31.375: E/AndroidRuntime(956): at java.lang.reflect.Method.invokeNative(Native Method) 06-09 19:44:31.375: E/AndroidRuntime(956): at java.lang.reflect.Method.invoke(Method.java:511) 06-09 19:44:31.375: E/AndroidRuntime(956): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102) 06-09 19:44:31.375: E/AndroidRuntime(956): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869) 06-09 19:44:31.375: E/AndroidRuntime(956): at dalvik.system.NativeStart.main(Native Method) 

MainActivity第121行： FlashController fc = new FlashController(this);

Answer 1

我遇到过类似的问题。 唯一的区别是我已将SDK版本更新为Android M（API 23）。

1. 首先将SDK更新为API 23。

2. 然后添加检查： Build.VERSION.SDK_INT >= Build.VERSION_CODES.M而不是Lollipop版本。

3. 那么你可以尝试下面的Android M版及以上代码：

 if (context.checkSelfPermission(Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) { CameraManager camera = (CameraManager) _context.getSystemService(Context.CAMERA_SERVICE); } 

希望这可以帮助。

Answer 2

只需将您的class级划分为两个：一个用于API2，另一个用于API1。 首先检查安装的android版本，然后运行相应的类。 像这样做：

  // Start Camera capture Image display public void intentStartCamera() { if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { Intent myIntent = new Intent(CaptureDetailsActivity.this, CaptureActivityCAPI2.class); startActivityForResult(myIntent, OPEN_CAMERA_REQUEST); } else { Intent myIntent = new Intent(CaptureDetailsActivity.this, CaptureActivityCAPI1.class); startActivityForResult(myIntent, OPEN_CAMERA_REQUEST); } } 

这是我在这个项目中的解决方案。