细节

芬兰湾的科特林1.2.70 在minSdkVersion 19中检查 Android studio 3.1.4

算法

模块-相机，位置，....

检查hasSystemFeature(如果模块在手机中存在) 检查用户是否有权限访问模块 发送权限请求(请求用户允许模块使用)

特性

使用活动和片段 只有一个结果响应 可以在一个请求中检查多个模块吗

解决方案

class PermissionType(val manifest_permission: String, val packageManager: String) {
    object Defined {
        val camera = PermissionType(Manifest.permission.CAMERA, PackageManager.FEATURE_CAMERA)
        val currentLocation = PermissionType(Manifest.permission.ACCESS_FINE_LOCATION, PackageManager.FEATURE_LOCATION_GPS)
    }
}

class  Permission {

    enum class PermissionResult {
        ACCESS_ALLOWED, ACCESS_DENIED, NO_SYSTEM_FEATURE;
    }

    interface ManagerDelegate {
        fun permissionManagerDelegate(result: Array<Pair<String, PermissionResult>>)
    }

    class Manager internal constructor(private val delegate: ManagerDelegate?) {

        private var context: Context? = null
        private var fragment: Fragment? = null
        private var activity: AppCompatActivity? = null
        private var permissionTypes: Array<PermissionType> = arrayOf()
        private val REQUEST_CODE = 999
        private val semaphore = Semaphore(1, true)
        private var result: Array<Pair<String, PermissionResult>> = arrayOf()


        constructor(permissionType: PermissionType, delegate: ManagerDelegate?): this(delegate) {
            permissionTypes = arrayOf(permissionType)
        }

        constructor(permissionTypes: Array<PermissionType>, delegate: ManagerDelegate?): this(delegate) {
            this.permissionTypes = permissionTypes
        }

        init {
            when (delegate) {
                is Fragment -> {
                    this.fragment = delegate
                    this.context = delegate.context
                }

                is AppCompatActivity -> {
                    this.activity = delegate
                    this.context = delegate
                }
            }
        }

        private fun hasSystemFeature(permissionType: PermissionType) : Boolean {
            return context?.packageManager?.hasSystemFeature(permissionType.packageManager) ?: false
        }

        private fun hasAccess(permissionType: PermissionType) : Boolean {
            return if (Build.VERSION.SDK_INT < 23) true else {
                context?.checkSelfPermission(permissionType.manifest_permission) == PackageManager.PERMISSION_GRANTED
            }
        }

        private fun sendRequest(permissionTypes: Array<String>) {

            if (fragment != null) {
                fragment?.requestPermissions(permissionTypes, REQUEST_CODE)
                return
            }

            if (activity != null){
                ActivityCompat.requestPermissions(activity!!, permissionTypes, REQUEST_CODE)
            }
        }

        fun check() {

            semaphore.acquire()
            AsyncTask.execute {
                var permissionsForSendingRequest: Array<String> = arrayOf()
                this.result = arrayOf()

                for (it in permissionTypes) {
                    if (!hasSystemFeature(it)) {
                        result += Pair(it.manifest_permission, PermissionResult.NO_SYSTEM_FEATURE)
                        continue
                    }

                    if (hasAccess(it)) {
                        result += Pair(it.manifest_permission, PermissionResult.ACCESS_ALLOWED)
                    } else {
                        permissionsForSendingRequest += it.manifest_permission
                    }
                }

                if (permissionsForSendingRequest.isNotEmpty()) {
                    sendRequest(permissionsForSendingRequest)
                } else {
                    delegate?.permissionManagerDelegate(result)
                }
            }
        }

        fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
            when (requestCode) {
                REQUEST_CODE -> {
                    if (grantResults.isEmpty()) {
                        return
                    }
                    for ((i,permission) in permissions.withIndex()) {
                        for (item in this.permissionTypes) {
                            if (permission == item.manifest_permission && i < grantResults.size) {
                                result += if (grantResults[i] == PackageManager.PERMISSION_GRANTED) {
                                    Pair(item.manifest_permission, PermissionResult.ACCESS_ALLOWED)
                                } else {
                                    Pair(item.manifest_permission, PermissionResult.ACCESS_DENIED)
                                }
                                break
                            }
                        }
                    }
                    delegate?.permissionManagerDelegate(result)
                }
            }
            semaphore.release()
        }
    }
}

在活动中的使用(在片段中相同)

class BaseActivity : AppCompatActivity(), Permission.ManagerDelegate {

    private lateinit var permissionManager: Permission.Manager

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.base_activity)

        permissionManager = Permission.Manager(arrayOf(PermissionType.Defined.camera, PermissionType.Defined.currentLocation), this)
        permissionManager.check()
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        permissionManager.onRequestPermissionsResult(requestCode, permissions, grantResults)
    }


    override fun permissionManagerDelegate(result: Array<Pair<String, Permission.PermissionResult>>) {
        result.forEach {
            println("!!! ${it.first} ${it.second}")
//            when (it.second) {
//                Permission.PermissionResult.NO_SYSTEM_FEATURE -> {
//                }
//
//                Permission.PermissionResult.ACCESS_DENIED  -> {
//                }
//
//                Permission.PermissionResult.ACCESS_ALLOWED -> {
//                }
//            }
        }
    }
}

你可以试试这个:

requestPermissions(permissions, PERMISSIONS_CODE);

如果你从一个片段中调用这段代码，它有自己的requestPermissions方法。我相信问题是你正在调用静态方法。

如果你想在一个片段中使用onRequestPermissionsResult(): FragmentCompat。requestPermissions(Fragment Fragment, String[] permissions, int requestCode)

我发现在调用android.support.v4.app.Fragment.requestPermissions的地方这很重要。

如果你在onCreate()中这样做，onRequestPermissionsResult()永远不会被调用。

解决方案:在onActivityCreated()中调用它;

@Override
public void onActivityCreated(Bundle savedInstanceState) {

    super.onActivityCreated(savedInstanceState);

    if (ContextCompat.checkSelfPermission(context, Manifest.permission.READ_CONTACTS) == PackageManager.PERMISSION_DENIED) 
        requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, 0);

}

如果你从一个片段中调用这段代码，它有自己的requestPermissions方法。

基本概念是，如果你在一个活动中，那么调用

ActivityCompat.requestPermissions(this,
                            permissionsList,
                            permissionscode);

如果是碎片，就打电话

requestPermissions(permissionsList,
                            permissionscode);

在这里，我想展示我的代码我是如何做到这一点的。

public class CheckPermission {

public Context context;

public static final int PERMISSION_REQUEST_CODE =  200;

public CheckPermission(Context context){
    this.context = context;
}

public boolean isPermissionGranted(){
    int read_contact = ContextCompat.checkSelfPermission(context.getApplicationContext() , READ_CONTACTS);
    int phone = ContextCompat.checkSelfPermission(context.getApplicationContext() , CALL_PHONE);

    return read_contact == PackageManager.PERMISSION_GRANTED && phone == PackageManager.PERMISSION_GRANTED;
   }
}

在这个类中，我想检查许可是否被授予。那我是不是会从我的MainActivity调用许可呢

public void requestForPermission() {
       ActivityCompat.requestPermissions(MainActivity.this, new String[]    {READ_CONTACTS, CALL_PHONE}, PERMISSION_REQUEST_CODE);
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch (requestCode) {
        case PERMISSION_REQUEST_CODE:
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                if (shouldShowRequestPermissionRationale(ACCESS_FINE_LOCATION)) {
                    showMessageOKCancel("You need to allow access to both the permissions",
                            new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int which) {
                                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                                        requestPermissions(new String[]{Manifest.permission.READ_CONTACTS, Manifest.permission.CALL_PHONE},
                                                PERMISSION_REQUEST_CODE);
                                    }
                                }
                            });
                    return;
                }
            }
    }
}

现在在onCreate方法中，你需要调用requestForPermission()函数。

就是这样。您也可以同时请求多个权限。

这会起作用的。

@Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }