使用相机时 android 中的权限被拒绝

Question

我是原生 android 开发的新手。我正在研究 android studio。我有一个 tabbed activity，其中我使用了 2 个选项卡。在一个选项卡中，有一张地图，其中标记了用户的 GPS 位置。第二个选项卡是拍照，然后将其保存在 OS 提供的存储中。为此，我在我的设备上使用了这个 tutorial、运行应用程序，但它崩溃了。我运行在 Marshmallow 上发布它。下面是我得到的错误

java.lang.SecurityException: Permission Denial: starting Intent { act=android.media.action.IMAGE_CAPTURE cmp=android/com.android.internal.app.ResolverActivity } from ProcessRecord{e8f9820 15070:com.example.accurat.faisal/u0a228} (pid=15070, uid=10228) with revoked permission android.permission.CAMERA
                                                                                at android.os.Parcel.readException(Parcel.java:1620)
                                                                                at android.os.Parcel.readException(Parcel.java:1573)
                                                                                at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:3181)
                                                                                at android.app.Instrumentation.execStartActivity(Instrumentation.java:1541)
                                                                                at android.app.Activity.startActivityForResult(Activity.java:4298)
                                                                                at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:50)
                                                                                at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:79)
                                                                                at android.support.v4.app.ActivityCompatJB.startActivityForResult(ActivityCompatJB.java:30)
                                                                                at android.support.v4.app.ActivityCompat.startActivityForResult(ActivityCompat.java:146)
                                                                                at android.support.v4.app.FragmentActivity.startActivityFromFragment(FragmentActivity.java:937)
                                                                                at android.support.v4.app.FragmentActivity$HostCallbacks.onStartActivityFromFragment(FragmentActivity.java:1047)
                                                                                at android.support.v4.app.Fragment.startActivityForResult(Fragment.java:954)
                                                                                at android.support.v4.app.Fragment.startActivityForResult(Fragment.java:943)
                                                                                at com.example.accurat.faisal.Camera.onClick(Camera.java:51)
                                                                                at android.view.View.performClick(View.java:5716)
                                                                                at android.widget.TextView.performClick(TextView.java:10926)
                                                                                at android.view.View$PerformClick.run(View.java:22596)
                                                                                at android.os.Handler.handleCallback(Handler.java:739)
                                                                                at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                at android.os.Looper.loop(Looper.java:148)
                                                                                at android.app.ActivityThread.main(ActivityThread.java:7325)
                                                                                at java.lang.reflect.Method.invoke(Native Method)
                                                                                at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230                                                                               at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

我搜索了一下，发现我应该请求许可，所以我按照这个 link 并尝试添加权限检查，如下所示

 button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // Check permission for CAMERA
            if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.CAMERA)
                    != PackageManager.PERMISSION_GRANTED) {

                // Check Permissions Now
                // Callback onRequestPermissionsResult interceptado na Activity MainActivity
                ActivityCompat.requestPermissions(getActivity(),
                        new String[]{Manifest.permission.CAMERA},
                        MainActivity.REQUEST_CAMERA);


            }

            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE );
        }
    });

但我得到 CAMERA 和 REQUEST_CAMERA 的 red text。虽然我也导入了它们，但仍然显示红色文本

import static android.Manifest.permission.CAMERA;
import static android.Manifest.permission.RECORD_AUDIO;
import static android.Manifest.permission.WRITE_EXTERNAL_STORAGE;

下面是我的清单文件

 <uses-permission android:name="com.example.accurat.faisal.permission.MAPS_RECEIVE"/>
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.hardware.camera"/>

我不知道问题是什么，也不知道解决方案，我一直坚持下去。

任何帮助将不胜感激

Answer 1

您需要在您的代码中添加权限检查，并根据接受或拒绝的用户操作显示相机预览 Beginning in Android 6.0 (API level 23), users grant permissions to apps while the app is running。此外，如果您正在创建将用作图像输入（通过相机捕获）的文件，则需要征得用户对 android.Manifest.permission.WRITE_EXTERNAL_STORAGE 的许可。

Answer 2

您必须使用：

<uses-permission-sdk-23 android:name="android.permission.CAMERA" />

如果您使用的是 API 23+，因为 CAMERA 权限被定义为危险权限，请参见此处： https://developer.android.com/guide/topics/permissions/requesting.html#normal-dangerous

用户必须在运行时接受权限。您应该检查意图结果：

@Override
public void onRequestPermissionsResult(int requestCode,
        String permissions[], int[] grantResults) {
    switch (requestCode) {
        case Manifest.permission.CAMERA: {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                // permission was granted, yay! Do the
                // contacts-related task you need to do.

            } else {

                // permission denied, boo! Disable the
                // functionality that depends on this permission.
            }
            return;
        }

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

https://developer.android.com/training/permissions/requesting.html

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