Question

我尝试以这种方式实现相机权限：

private void checkCameraPermissions() {
        if(checkCameraHardware(this)) {
            if (checkSelfPermission(Manifest.permission_group.camera)
                    != PackageManager.PERMISSION_GRANTED) {

                Crashlytics.log("Requesting camera permission");

                // Should we show an explanation?
                if (shouldShowRequestPermissionRationale(
                        Manifest.permission_group.camera)) {
                    // Explain to the user why we need to use the camera
                    showRationaleForCameraUse();
                }

                requestPermissions(new String[]{Manifest.permission_group.camera},
                        Constants.MY_PERMISSIONS_REQUEST_CAMERA_GROUP);

                // MY_PERMISSIONS_REQUEST_CAMERA_GROUP is an
                // app-defined int constant
            } else {
                startApp();
            }
        }else{
            showNoCameraAvailableAlert();
        }
    }

@Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {
        switch (requestCode) {
            case Constants.MY_PERMISSIONS_REQUEST_CAMERA_GROUP: {
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    // permission was granted, yay!
                    // start the app
                    startApp();

                } else {

                    // permission denied, boo!
                    // leav the app!
                    showNoCameraAvailableAlert();
                }
                return;
            }

            // other 'switch' lines to check for other
            // permissions this app might request
        }
    }

并出现以下错误：

java.lang.NoSuchMethodError: No virtual method checkSelfPermission(Ljava/lang/String;)I in class Lim/emu/app/emu/app/view/splash/SplashActivity; or its super classes (declaration of 'im.emu.app.emu.app.view.splash.SplashActivity' appears in /data/app/im.emu.app.emu.test-1/base.apk)
            at im.emu.app.emu.app.view.splash.SplashActivity.checkCameraPermissions(SplashActivity.java:74)
            at im.emu.app.emu.app.view.splash.SplashActivity.onCreate(SplashActivity.java:52)
            at android.app.Activity.performCreate(Activity.java:5977)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2258)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2367)
            at android.app.ActivityThread.access$800(ActivityThread.java:148)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1283)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5274)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:909)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:704)
08-30 16:34:10.801  17087-17357/im.emu.app.emu.test I/Fabric﹕ Crashlytics report upload complete: 55E30629033A-0001-42BF-296ED8AC703A.cls

我有什么想法可以解决这个问题？附：如果需要更多信息，请询问

Answer 1

您应该在运行以前版本的设备上运行代码。您必须改为使用ContextCompat.checkSelfPermission()。

Answer 2

小心

'shouldShowRequestPermissionRationale(
                        Manifest.permission_group.camera)'

我在权限组中遇到了个人权限而不是群组的问题，如果您使用了另一个，则会引发异常。

Answer 3

您必须使用ActivityCompat.checkSelfPermission()代替Pre-Lollipop设备的后向功能。因此，this.checkSelfPermission()只能用于声明minSdkVersion 23

的应用

Answer 4

您忘了在AndroidManifest.xml中授予权限

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

尝试为Android M实现摄像头权限获取无虚拟方法checkSelfPermission

4 个答案: