Android 6.0.1-权限问题=wifiManager.getScanResults()返回0
permissionsList.add()不起作用,但MainActivity.this.requestPermissions()可以正常工作。问题是它会带来一个对话框,询问用户是否允许位置权限 为什么添加权限不起作用 有没有办法避免出现对话框 请参见下面我的最小代码:Android 6.0.1-权限问题=wifiManager.getScanResults()返回0,android,android-permissions,wifimanager,Android,Android Permissions,Wifimanager,permissionsList.add()不起作用,但MainActivity.this.requestPermissions()可以正常工作。问题是它会带来一个对话框,询问用户是否允许位置权限 为什么添加权限不起作用 有没有办法避免出现对话框 请参见下面我的最小代码: public class MainActivity extends AppCompatActivity { WifiManager wifiManager; WifiBroadcastReceiver broadcastRece
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;
}
}
public类MainActivity扩展了AppCompatActivity{
WifiManager WifiManager;
无线射频接收器;
语境;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context=getApplicationContext();
列表权限列表=新的ArrayList();
permissionsList.add(Manifest.permission.ACCESS\u FINE\u位置);
permissionsList.add(Manifest.permission.ACCESS\u\u位置);
if(Build.VERSION.SDK\u INT>=Build.VERSION\u code.M){
if(checkSelfPermission(Manifest.permission.ACCESS\u位置)!=PackageManager.permission\u已授予&&
checkSelfPermission(Manifest.permission.ACCESS\u FINE\u LOCATION)!=PackageManager.permission\u provided){
MainActivity.this.requestPermissions(新字符串[]{Manifest.permission.ACCESS\u FINE\u LOCATION},100);
MainActivity.this.requestPermissions(新字符串[]{Manifest.permission.ACCESS\u\u LOCATION},100);
}
}
按钮扫描=(按钮)findViewById(R.id.scan);
wifiManager=(wifiManager)this.getSystemService(Context.WIFI_服务);
wifiManager.setWifiEnabled(true);
scan.setOnClickListener(新视图.OnClickListener(){
公共void onClick(视图v){
if(wifiManager!=null)
wifiManager.startScan();
}
});
broadcastReceiver=新的WifiBroadcastReceiver();
//关于附件E接收器au扫描结果
registerReceiver(广播接收器,新意向过滤器(
WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
}
公共类WifiBroadcastReceiver扩展广播接收器{
私人WifiManager WifiManager;
@凌驾
公共void onReceive(上下文、意图){
wifiManager=((MainActivity)上下文);
List listscan=wifiManager.getScanResults();
}
}
公共WifiManager getCurrentWifiManager(){
返回wifiManager;
}
}
下面是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>
从Android 6.0(API级别23)开始,用户向
应用程序运行时,而不是安装应用程序时。这
这种方法简化了应用程序安装过程,因为用户不需要
安装或更新应用程序时需要授予权限。它也
让用户能够更好地控制应用程序的功能;例如
用户可以选择让摄像头应用程序访问摄像头,但不允许
到设备位置。用户可以随时撤销权限
时间,转到应用程序的设置屏幕
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