[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/ButtonManager.java
old mode 100755new mode 100644
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@@ -33,6 +33,12 @@
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 import com.android.camera.widget.ModeOptions;
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 import com.android.camera2.R;
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+import android.util.Log;
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+import android.hardware.camera2.CameraManager;
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+import android.hardware.camera2.CameraAccessException;
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+import android.hardware.camera2.CameraCharacteristics;
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+import com.android.camera.one.OneCamera.Facing;
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+
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 /**
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  * A  class for generating pre-initialized
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  * {@link #android.widget.ImageButton}s.
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@@ -51,6 +57,10 @@
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     public static final int BUTTON_GRID_LINES = 10;
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     public static final int BUTTON_EXPOSURE_COMPENSATION = 11;
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     public static final int BUTTON_COUNTDOWN = 12;
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+
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+    public static final int ZERO_CAMERA = 0;
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+    public static final int ONE_CAMERA = 1;
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+    public static final int TWO_CAMERAS = 2;
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     /** For two state MultiToggleImageButtons, the off index. */
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     public static final int OFF = 0;
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@@ -101,7 +111,8 @@
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     private final AppController mAppController;
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-    private static final String ANDROID_UVC_PROPERTY = "ro.camera.uvcfacing";
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+    private CameraManager mCameraManager;
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+    private static String TAG = "ButtonManager";
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     /**
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      * Get a new global ButtonManager.
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@@ -114,6 +125,7 @@
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         mSettingsManager = app.getSettingsManager();
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         mSettingsManager.addListener(this);
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+        mCameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
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     }
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     /**
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@@ -361,27 +373,66 @@
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                 initializeHdrPlusFlashButton(button, cb, preCb, R.array.camera_flashmode_icons);
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                 break;
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             case BUTTON_CAMERA:
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-                String uvcProperty = SystemProperties.get(ANDROID_UVC_PROPERTY, "");
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-                if(uvcProperty.equals("null") || uvcProperty.equals("")){
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-                    initializeCameraButton(button, cb,
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-                            preCb, R.array.camera_id_icons);
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+                String[] cameraIds = new String[]{};
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+                int front_num = 0;
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+                int back_num = 0;
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+                int external_num = 0;
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+                try {
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+                    cameraIds = mCameraManager.getCameraIdList();
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+                    for (String cameraId : cameraIds) {
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+                        CameraCharacteristics characteristics = mCameraManager
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+                            .getCameraCharacteristics(cameraId);
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+                        if (characteristics.get(CameraCharacteristics.LENS_FACING) ==
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+                                CameraCharacteristics.LENS_FACING_FRONT) {
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+                            front_num = front_num + 1;
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+                        } else if (characteristics.get(CameraCharacteristics.LENS_FACING) ==
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+                                CameraCharacteristics.LENS_FACING_BACK) {
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+                            back_num = back_num + 1;
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+                        } else if (characteristics.get(CameraCharacteristics.LENS_FACING) ==
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+                                CameraCharacteristics.LENS_FACING_EXTERNAL) {
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+                            external_num = external_num + 1;
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+                        }
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+                    }
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                 }
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-                else if (uvcProperty.equals("back")) {
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-                    initializeCameraButton(button, cb,
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-                            preCb, R.array.camera_id_icons_with_front_external);
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+                catch (CameraAccessException ex) {
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+                    Log.e(TAG, "Unable to read camera list.", ex);
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                 }
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-                else if (uvcProperty.equals("front")) {
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-                    initializeCameraButton(button, cb,
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-                            preCb, R.array.camera_id_icons_with_back_external);
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+                if (front_num == ONE_CAMERA && back_num == ZERO_CAMERA) {
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+                    if (external_num == ONE_CAMERA) {
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+                        initializeCameraButton(button, cb,
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+                                preCb, R.array.camera_id_icon_front_with_external);
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+                    } else if (external_num == TWO_CAMERAS) {
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+                        initializeCameraButton(button, cb,
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+                                preCb, R.array.camera_id_icon_front_with_double_external);
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+                    }
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+                } else if (front_num == ZERO_CAMERA && back_num == ONE_CAMERA) {
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+                    if (external_num == ONE_CAMERA) {
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+                        initializeCameraButton(button, cb,
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+                                preCb, R.array.camera_id_icon_back_with_external);
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+                    } else if (external_num == TWO_CAMERAS) {
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+                        initializeCameraButton(button, cb,
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+                                preCb, R.array.camera_id_icon_back_with_double_external);
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+                    }
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+                } else if (front_num == ONE_CAMERA && back_num == ONE_CAMERA) {
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+                    if (external_num == ZERO_CAMERA) {
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+                        initializeCameraButton(button, cb,
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+                                preCb, R.array.camera_id_icons);
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+                    } else if (external_num == ONE_CAMERA) {
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+                        initializeCameraButton(button, cb,
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+                                preCb, R.array.camera_id_icons_with_external);
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+                    } else if (external_num == TWO_CAMERAS) {
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+                        initializeCameraButton(button, cb,
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+                                preCb, R.array.camera_id_icons_with_double_external);
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+                    }
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+                } else {
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+                    switch (cameraIds.length) {
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+                        case TWO_CAMERAS:
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+                            initializeCameraButton(button, cb,
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+                                    preCb, R.array.camera_id_icons_external_double);
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+                            break;
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+                    }
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                 }
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-                else if (uvcProperty.equals("external")) {
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-                    initializeCameraButton(button, cb,
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-                            preCb, R.array.camera_id_icons_with_external);
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-                }
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-                else if (uvcProperty.equals("external-only")) {
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-                    initializeCameraButton(button, cb,
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-                            preCb, R.array.camera_id_icons_with_only_external);
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-                }
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+
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                 break;
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             case BUTTON_HDR_PLUS:
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                 initializeHdrPlusButton(button, cb, preCb, R.array.pref_camera_hdr_plus_icons);