Android 6.0.1 - 权限问题 = wifiManager.getScanResults() 返回 0

Question

permissionsList.add() 不起作用，但 MainActivity.this.requestPermissions() 工作正常。问题是它带来了一个对话框，询问用户是否允许位置权限。

为什么添加权限不起作用？

有没有办法避开对话框？

在下面查看我的最小代码：

public class MainActivity extends AppCompatActivity {
WifiManager wifiManager;
WifiBroadcastReceiver broadcastReceiver;

Context context;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    context = getApplicationContext();

    List<String> permissionsList = new ArrayList<String>();
    permissionsList.add(Manifest.permission.ACCESS_FINE_LOCATION);
    permissionsList.add(Manifest.permission.ACCESS_COARSE_LOCATION);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        if(checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
                checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            MainActivity.this.requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 100);
            MainActivity.this.requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, 100);
            }
        }

        Button scan = (Button) findViewById(R.id.scan);

        wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
        wifiManager.setWifiEnabled(true);

        scan.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
               if(wifiManager != null)
                    wifiManager.startScan();
            }
        });


        broadcastReceiver = new WifiBroadcastReceiver();

        // On attache le receiver au scan result
        registerReceiver(broadcastReceiver, new IntentFilter(
                WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));

    }

    public class WifiBroadcastReceiver extends BroadcastReceiver {

        private WifiManager wifiManager;


        @Override
        public void onReceive(Context context, Intent intent) {
            wifiManager = ((MainActivity) context).getCurrentWifiManager();
            List<ScanResult> listeScan = wifiManager.getScanResults();
          }
    }


    public WifiManager getCurrentWifiManager() {
        return wifiManager;
    }

 }

这里是 manifest.xml：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.bernard_zelmans.checksecurity">

    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <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_WIFI_STATE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".Ping"></activity>
    </application>

</manifest>

Answer 1

从 Android 6.0（API 级别 23）开始，用户授予以下权限 应用程序运行时的应用程序，而不是在他们安装应用程序时。这 方法简化了应用程序安装过程，因为用户不 需要在安装或更新应用程序时授予权限。它也是 让用户更好地控制应用程序的功能；例如， 用户可以选择让相机应用程序访问相机，但不能 到设备位置。用户可以随时撤销权限 时间，通过转到应用程序的设置屏幕。

资源和更多阅读：

• https://developer.android.com/training/permissions/requesting.html
• https://developer.android.com/guide/topics/security/permissions.html#normal-dangerous