[4/4]解决USB摄像头打开相机预览界面绿屏

liyujie

2025-08-28 786ff4f4ca2374bdd9177f2e24b503d43e7a3b93

 android/packages/apps/Camera2/src/com/android/camera/CaptureModule.java
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@@ -23,6 +23,9 @@
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 import android.graphics.RectF;
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 import android.graphics.SurfaceTexture;
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 import android.location.Location;
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+import android.hardware.camera2.CameraAccessException;
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+import android.hardware.camera2.CameraCharacteristics;
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+import android.hardware.camera2.CameraManager;
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 import android.media.MediaActionSound;
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 import android.net.Uri;
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 import android.os.AsyncTask;
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@@ -354,6 +357,7 @@
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     public CaptureModule(AppController appController) {
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         this(appController, false);
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     }
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+    private CameraManager mCameraManager;
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     /** Constructs a new capture module. */
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     public CaptureModule(AppController appController, boolean stickyHdr) {
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@@ -414,6 +418,7 @@
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         mCameraHandler = new Handler(thread.getLooper());
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         mActivity = activity;
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         mOneCameraOpener = mAppController.getCameraOpener();
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+        mCameraManager = (CameraManager) mContext.getSystemService(Context.CAMERA_SERVICE);
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         try {
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             mOneCameraManager = OneCameraModule.provideOneCameraManager();
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@@ -429,6 +434,29 @@
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         Log.d(TAG,"SettingsManager cameraID = " +
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                 mSettingsManager.getInteger(mAppController.getModuleScope(),
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                 Keys.KEY_CAMERA_ID) + " facing = " + mCameraFacing);
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+
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+        int cameraId = mSettingsManager.getInteger(mAppController.getModuleScope(),
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+                Keys.KEY_CAMERA_ID);
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+        try {
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+            String[] cameraIds = mCameraManager.getCameraIdList();
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+            Log.d(TAG, "cameraIds len = " + cameraIds.length);
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+            boolean foundCameraId = false;
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+            for (String currentCameraId : cameraIds) {
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+                Log.d(TAG,"Enumerate cameraId = " + currentCameraId);
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+                if (Integer.parseInt(currentCameraId) == cameraId) {
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+                    Log.d(TAG, "find exists currentCameraId matches first camera id");
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+                    foundCameraId = true;
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+                    break;
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+                }
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+            }
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+            if (!foundCameraId && cameraIds.length > 0) {
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+                cameraId = Integer.parseInt(cameraIds[0]);
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+                Log.d(TAG,"cameraId sets to first id of cameraIds: " + cameraId);
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+            }
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+        } catch (CameraAccessException ex) {
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+            Log.w(TAG, "Unable to get camera ID", ex);
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+        }
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+
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         mShowErrorAndFinish = !updateCameraCharacteristics();
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         if (mShowErrorAndFinish) {
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             return;
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@@ -1398,6 +1426,30 @@
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         boolean useHdr = mHdrPlusEnabled && mCameraFacing == Facing.BACK;
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         CameraId cameraId = mOneCameraManager.findFirstCameraFacing(mCameraFacing);
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+
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+        int settingsCameraId = mSettingsManager.getInteger(mAppController.getModuleScope(), Keys.KEY_CAMERA_ID);
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+                //check if settingsCameraId exists now
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+        try {
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+            String[] cameraIds = mCameraManager.getCameraIdList();
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+            boolean foundCameraId = false;
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+            for (String currentCameraId : cameraIds) {
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+                Log.d(TAG,"Enumerate cameraId = " + currentCameraId);
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+                if (Integer.parseInt(currentCameraId) == settingsCameraId) {
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+                    Log.d(TAG, "find exists currentCameraId matches first camera id");
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+                    foundCameraId = true;
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+                    if (Integer.parseInt(cameraId.getValue()) != settingsCameraId) {
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+                        cameraId = CameraId.from(String.valueOf(settingsCameraId));
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+                    }
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+                    break;
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+                }
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+            }
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+            if (!foundCameraId && cameraIds.length > 0) {
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+                cameraId = CameraId.from(String.valueOf(cameraIds[0]));
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+                Log.d(TAG,"cameraId sets to first id of cameraIds: " + cameraId);
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+            }
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+        } catch (CameraAccessException ex) {
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+            Log.w(TAG, "Unable to get camera ID", ex);
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+        }
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         final String settingScope = SettingsManager.getCameraSettingScope(cameraId.getValue());
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         OneCameraCaptureSetting captureSetting;