AndroidM相机意图+权限bug？

Question

我正试图让我的应用程序为新的Android M权限更改做好准备，发现了一些奇怪的行为。我的应用程序使用相机意图机制，允许用户从相机中获得一张照片。但是在另一个活动中，需要使用具有camera权限的camera本身（因为库依赖项card.io需要这样做）。

> 09-25 21:57:55.260 774-8053/? I/ActivityManager: START u0
> {act=android.media.action.IMAGE_CAPTURE flg=0x3000003
> pkg=com.google.android.GoogleCamera
> cmp=com.google.android.GoogleCamera/com.android.camera.CaptureActivity
> (has clip) (has extras)} from uid 10098 on display 0 09-25
> 21:57:55.261 774-8053/? W/ActivityManager: Permission Denial: starting
> Intent { act=android.media.action.IMAGE_CAPTURE flg=0x3000003
> pkg=com.google.android.GoogleCamera
> cmp=com.google.android.GoogleCamera/com.android.camera.CaptureActivity
> (has clip) (has extras) } from null (pid=-1, uid=10098) with revoked
> permission android.permission.CAMERA 09-25 21:57:55.263 32657-32657/?
> E/ResolverActivity: Unable to launch as uid 10098 package
> com.example.me.mycamerselectapp, while running in android:ui 09-25
> 21:57:55.263 32657-32657/? E/ResolverActivity:
> java.lang.SecurityException: Permission Denial: starting Intent {
> act=android.media.action.IMAGE_CAPTURE flg=0x3000003
> pkg=com.google.android.GoogleCamera
> cmp=com.google.android.GoogleCamera/com.android.camera.CaptureActivity
> (has clip) (has extras) } from null (pid=-1, uid=10098) with revoked
> permission android.permission.CAMERA 09-25 21:57:55.263 32657-32657/?
> E/ResolverActivity:     at
> android.os.Parcel.readException(Parcel.java:1599) 09-25 21:57:55.263
> 32657-32657/? E/ResolverActivity:     at
> android.os.Parcel.readException(Parcel.java:1552) 09-25 21:57:55.263
> 32657-32657/? E/ResolverActivity:     at
> android.app.ActivityManagerProxy.startActivityAsCaller(ActivityManagerNative.java:2730)
> 09-25 21:57:55.263 32657-32657/? E/ResolverActivity:     at
> android.app.Instrumentation.execStartActivityAsCaller(Instrumentation.java:1725)
> 09-25 21:57:55.263 32657-32657/? E/ResolverActivity:     at
> android.app.Activity.startActivityAsCaller(Activity.java:4047) 09-25
> 21:57:55.263 32657-32657/? E/ResolverActivity:     at
> com.android.internal.app.ResolverActivity$DisplayResolveInfo.startAsCaller(ResolverActivity.java:983)
> 09-25 21:57:55.263 32657-32657/? E/ResolverActivity:     at
> com.android.internal.app.ResolverActivity.safelyStartActivity(ResolverActivity.java:772)
> 09-25 21:57:55.263 32657-32657/? E/ResolverActivity:     at
> com.android.internal.app.ResolverActivity.onTargetSelected(ResolverActivity.java:754)
> 09-25 21:57:55.263 32657-32657/? E/ResolverActivity:     at
> com.android.internal.app.ChooserActivity.onTargetSelected(ChooserActivity.java:305)
> 09-25 21:57:55.263 32657-32657/? E/ResolverActivity:     at
> com.android.internal.app.ResolverActivity.startSelected(ResolverActivity.java:603)
> 09-25 21:57:55.263 32657-32657/? E/ResolverActivity:     at
> com.android.internal.app.ChooserActivity.startSelected(ChooserActivity.java:310)
> 09-25 21:57:55.263 32657-32657/? E/ResolverActivity:     at
> com.android.internal.app.ChooserActivity$ChooserRowAdapter$2.onClick(ChooserActivity.java:990)
> 09-25 21:57:55.263 32657-32657/? E/ResolverActivity:     at
> android.view.View.performClick(View.java:5198) 09-25 21:57:55.263
> 32657-32657/? E/ResolverActivity:     at
> android.view.View$PerformClick.run(View.java:21147) 09-25 21:57:55.263
> 32657-32657/? E/ResolverActivity:     at
> android.os.Handler.handleCallback(Handler.java:739) 09-25 21:57:55.263
> 32657-32657/? E/ResolverActivity:     at
> android.os.Handler.dispatchMessage(Handler.java:95) 09-25 21:57:55.263
> 32657-32657/? E/ResolverActivity:     at
> android.os.Looper.loop(Looper.java:148) 09-25 21:57:55.263
> 32657-32657/? E/ResolverActivity:     at
> android.app.ActivityThread.main(ActivityThread.java:5417) 09-25
> 21:57:55.263 32657-32657/? E/ResolverActivity:     at
> java.lang.reflect.Method.invoke(Native Method) 09-25 21:57:55.263
> 32657-32657/? E/ResolverActivity:     at
> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
> 09-25 21:57:55.263 32657-32657/? E/ResolverActivity:     at
> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 09-25
> 21:57:55.286 1159-1159/? I/Keyboard.Facilitator: onFinishInput() 09-25
> 21:57:55.297 32657-32676/? E/Surface: getSlotFromBufferLocked: unknown
> buffer: 0xaec352e0 09-25 21:57:55.344 325-349/? V/RenderScript:
> 0xb3693000 Launching thread(s), CPUs 4 09-25 21:57:57.290 325-349/?
> E/Surface: getSlotFromBufferLocked: unknown buffer: 0xb3f88240

<uses-permission android:name="android.permission.CAMERA" />

这是我用来让用户用相机点击一张照片和/或选择一张图像的代码

public static Intent openImageIntent(Context context, Uri cameraOutputFile) {

    // Camera.
    final List<Intent> cameraIntents = new ArrayList<Intent>();
    final Intent captureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
    final PackageManager packageManager = context.getPackageManager();
    final List<ResolveInfo> listCam = packageManager.queryIntentActivities(captureIntent, 0);
    for(ResolveInfo res : listCam) {
        final String packageName = res.activityInfo.packageName;
        final Intent intent = new Intent(captureIntent);
        intent.setComponent(new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
        intent.setPackage(packageName);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, cameraOutputFile);
        cameraIntents.add(intent);
    }

    // Filesystem.
    final Intent galleryIntent = new Intent();
    galleryIntent.setType("image/*");
    galleryIntent.setAction(Intent.ACTION_GET_CONTENT);

    // Chooser of filesystem options.
    final Intent chooserIntent = Intent.createChooser(galleryIntent, "Take or select pic");

    // Add the camera options.
    chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, cameraIntents.toArray(new Parcelable[]{}));
    return chooserIntent;
}

我在活动中单击按钮时调用OpenImageIntent()。当我没有相机权限在我的应用程序，它的工作很好，但与添加，我得到了上面发布的异常。

    @Override
    public void onClick(View v) {
        Intent picCaptureIntenet = openImageIntent(MainActivity.this, getTempImageFileUri(MainActivity.this));
        try {
            startActivityForResult(picCaptureIntenet, 100);
        } catch(Exception e) {
            Toast.makeText(MainActivity.this, e.getMessage(), Toast.LENGTH_SHORT).show();
        }
    }

Answer 1

我也遇到了同样的问题，并从谷歌找到了以下文档:https://developer.android.com/reference/android/provider/mediastore.html#action_image_capture

“注意：如果应用程序的目标是M及以上，并声明使用未授予的相机权限，那么擅自使用此操作将导致SecurityException。”

这真的很奇怪。一点道理都没有。该应用程序使用intent声明相机权限，操作IMAGE_CAPTURE只是运行到securityexception。但是，如果您的应用程序没有声明相机权限，使用intent with action IMAGE_CAPTURE可以毫无问题地启动相机应用程序。

变通方法是检查应用程序在清单中有摄像头权限，如果是，在启动意图之前请求摄像头权限。

下面是检查清单中是否包括权限的方法，不管是否授予权限。

public boolean hasPermissionInManifest(Context context, String permissionName) {
    final String packageName = context.getPackageName();
    try {
        final PackageInfo packageInfo = context.getPackageManager()
                .getPackageInfo(packageName, PackageManager.GET_PERMISSIONS);
        final String[] declaredPermisisons = packageInfo.requestedPermissions;
        if (declaredPermisisons != null && declaredPermisisons.length > 0) {
            for (String p : declaredPermisisons) {
                if (p.equals(permissionName)) {
                    return true;
                }
            }
        }
    } catch (NameNotFoundException e) {

    }
    return false;
}