在Android 6中访问WIFI的权限 [英] permission for accessing WIFI in android 6

问题描述

我是android studio的新手，我以前在我的应用程序上使用的是android 5.1版，但工作正常，但现在在6中，我无法获得许可，或者我不确定我的方法是否错误.我正在制作一个使用可用于我的手机的接入点列表的应用程序.但是，即使我被授予许可，我的应用程序也不会向我显示wifi列表，但是相同的代码在早期版本中也能很好地工作.

I am new to android studio, i was previously working on android version 5.1 for my app and it worked fine but now in 6 i am not able to get permission or i am not sure if my method is wrong. I am making an app which uses the list of access points available for my mobile. But even though i am granted permission my app does not show me the wifi list but the same code works well for earlier versions.

Mainactivity:

package com.wiferange.wifi_test;

import android.Manifest;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiManager;
import android.os.Build;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Gravity;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import java.util.List;

public class MainActivity extends AppCompatActivity {
ListView lv;
String lists[]={"a","b"};
WifiManager wifi;
String wifis[];
WifiScanReceiver wifiReciever;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    lv = (ListView)findViewById(R.id.listView);
    wifi=(WifiManager)getSystemService(Context.WIFI_SERVICE);
    wifiReciever = new WifiScanReceiver();

    getPermission();

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
                        }
    });

}

protected void onPause() {
    unregisterReceiver(wifiReciever);
    super.onPause();
}

protected void onResume() {
    registerReceiver(wifiReciever, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
    super.onResume();
}
private void getPermission() {
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && checkSelfPermission(Manifest.permission.ACCESS_WIFI_STATE) != PackageManager.PERMISSION_GRANTED){
        requestPermissions(new String[]{Manifest.permission.ACCESS_WIFI_STATE},0x12345);
       // lv.setAdapter(new ArrayAdapter<String>(getApplicationContext(),android.R.layout.simple_list_item_1,lists));
        //After this point you wait for callback in onRequestPermissionsResult(int, String[], int[]) overriden method
    }else{
        wifi.startScan();

        //do scanning, permission was previously granted; or legacy device
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { //funcitno executes when some permission was granted
    if (requestCode == 0x12345) {
        for (int grantResult : grantResults) {
            if (grantResult != PackageManager.PERMISSION_GRANTED) { //check if permission was already grnated and start scannig if yes
                wifi .startScan() ;
                return;
            }
        }
        getPermission(); //ask for permission if not given
    }
}

private class WifiScanReceiver extends BroadcastReceiver {
    public void onReceive(Context c, Intent intent) {
        List<ScanResult> wifiScanList = wifi.getScanResults();
        wifis = new String[wifiScanList.size()];

        for(int i = 0; i < wifiScanList.size(); i++){
            wifis[i] = ((wifiScanList.get(i)).toString());
        }

        lv.setAdapter(new ArrayAdapter<String>(getApplicationContext(),android.R.layout.simple_list_item_1,wifis));

    }
}



@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}
}

清单:

   <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.wiferange.wifi_test">
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_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"
        android:label="@string/app_name"
        android:theme="@style/AppTheme.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

请帮助我解决这个问题.提前致谢 ！！！！

Kindly help me to solve this . Thanks in advance !!!!

推荐答案

您正在请求错误的运行时权限.根据 Android 6.0的更改:

You are requesting the wrong runtime permission. As per the Android 6.0 changes:

要通过蓝牙和Wi-Fi扫描访问附近的外部设备的硬件标识符，您的应用现在必须具有 ACCESS_COARSE_LOCATION 权限

您必须请求并获得这些运行时权限之一才能进行wifi扫描.

You must request and be granted one of those runtime permissions to do wifi scans.

这篇关于在Android 6中访问WIFI的权限的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！