wifip2pManager.discoverPeers() 在 ANDROID 10 中失败，尽管使用了运行时权限并且也在清单中
wifip2pManager.discoverPeers() fails IN ANDROID 10 despite of using runtime permission and in Manifest too
我正在尝试 运行 wifip2p 文档页面上提供的 wifidirectdemo 应用程序，但在 android 10 上 运行ning perfectly.I 尝试了 perfectly.I 中提到的解决方案=14=] ，但没有 helped.All 其他 wifip2p 功能通常 运行ning 只有这导致问题和 returns 0 即错误代码。
感谢您的任何建议。
Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.deom">
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<!-- Google Play filtering -->
<uses-feature android:name="android.hardware.wifi.direct" android:required="true"/>
<application android:theme="@android:style/Theme.Holo" android:label="@string/app_name" android:icon="@drawable/ic_launcher">
<activity android:name=".WiFiDirectActivity" android:label="@string/app_name" android:launchMode="singleTask">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<provider
android:name="androidx.core.content.FileProvider"
android:authorities="${applicationId}.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>
<!-- Used for transferring files after a successful connection -->
<service android:name=".FileTransferService" android:enabled="true"/>
</application>
</manifest>
WifiDirectActivity.java
package com.example.deom;
import android.Manifest;
import android.annotation.SuppressLint;
import android.app.Activity;
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.WifiManager;
import android.net.wifi.p2p.WifiP2pConfig;
import android.net.wifi.p2p.WifiP2pDevice;
import android.net.wifi.p2p.WifiP2pManager;
import android.net.wifi.p2p.WifiP2pManager.ActionListener;
import android.net.wifi.p2p.WifiP2pManager.Channel;
import android.net.wifi.p2p.WifiP2pManager.ChannelListener;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
/**
* An activity that uses WiFi Direct APIs to discover and connect with available
* devices. WiFi Direct APIs are asynchronous and rely on callback mechanism
* using interfaces to notify the application of operation success or failure.
* The application should also register a BroadcastReceiver for notification of
* WiFi state related events.
*/
public class WiFiDirectActivity extends Activity implements ChannelListener, DeviceListFragment.DeviceActionListener {
public static final String TAG = "wifidirectdemo";
private static final int PERMISSIONS_REQUEST_CODE_ACCESS_FINE_LOCATION = 1001;
private WifiP2pManager manager;
private boolean isWifiP2pEnabled = false;
private boolean retryChannel = false;
private final IntentFilter intentFilter = new IntentFilter();
private Channel channel;
private BroadcastReceiver receiver = null;
/**
* @param isWifiP2pEnabled the isWifiP2pEnabled to set
*/
public void setIsWifiP2pEnabled(boolean isWifiP2pEnabled) {
this.isWifiP2pEnabled = isWifiP2pEnabled;
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions,
int[] grantResults) {
switch (requestCode) {
case PERMISSIONS_REQUEST_CODE_ACCESS_FINE_LOCATION:
if (grantResults[0] != PackageManager.PERMISSION_GRANTED) {
Log.e(TAG, "Fine location permission is not granted!");
finish();
}
break;
}
}
private boolean initP2p() {
// Device capability definition check
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_WIFI_DIRECT)) {
Log.e(TAG, "Wi-Fi Direct is not supported by this device.");
return false;
}
// Hardware capability check
WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
if (wifiManager == null) {
Log.e(TAG, "Cannot get Wi-Fi system service.");
return false;
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
if (!wifiManager.isP2pSupported()) {
Log.e(TAG, "Wi-Fi Direct is not supported by the hardware or Wi-Fi is off.");
return false;
}
}
manager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);
if (manager == null) {
Log.e(TAG, "Cannot get Wi-Fi Direct system service.");
return false;
}
channel = manager.initialize(this, getMainLooper(), null);
if (channel == null) {
Log.e(TAG, "Cannot initialize Wi-Fi Direct.");
return false;
}
return true;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// add necessary intent values to be matched.
intentFilter.addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION);
intentFilter.addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION);
intentFilter.addAction(WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION);
intentFilter.addAction(WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION);
if (!initP2p()) {
finish();
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
&& checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
WiFiDirectActivity.PERMISSIONS_REQUEST_CODE_ACCESS_FINE_LOCATION);
// After this point you wait for callback in
// onRequestPermissionsResult(int, String[], int[]) overridden method
}
}
/** register the BroadcastReceiver with the intent values to be matched */
@Override
public void onResume() {
super.onResume();
receiver = new WiFiDirectBroadcastReceiver(manager, channel, this);
registerReceiver(receiver, intentFilter);
}
@Override
public void onPause() {
super.onPause();
unregisterReceiver(receiver);
}
/**
* Remove all peers and clear all fields. This is called on
* BroadcastReceiver receiving a state change event.
*/
public void resetData() {
DeviceListFragment fragmentList = (DeviceListFragment) getFragmentManager()
.findFragmentById(R.id.frag_list);
DeviceDetailFragment fragmentDetails = (DeviceDetailFragment) getFragmentManager()
.findFragmentById(R.id.frag_detail);
if (fragmentList != null) {
fragmentList.clearPeers();
}
if (fragmentDetails != null) {
fragmentDetails.resetViews();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.action_items, menu);
return true;
}
/*
* (non-Javadoc)
* @see android.app.Activity#onOptionsItemSelected(android.view.MenuItem)
*/
@SuppressLint("MissingPermission")
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.atn_direct_enable:
if (manager != null && channel != null) {
// Since this is the system wireless settings activity, it's
// not going to send us a result. We will be notified by
// WiFiDeviceBroadcastReceiver instead.
startActivity(new Intent(Settings.ACTION_WIRELESS_SETTINGS));
} else {
Log.e(TAG, "channel or manager is null");
}
return true;
case R.id.atn_direct_discover:
if (!isWifiP2pEnabled) {
Toast.makeText(WiFiDirectActivity.this, R.string.p2p_off_warning,
Toast.LENGTH_SHORT).show();
return true;
}
final DeviceListFragment fragment = (DeviceListFragment) getFragmentManager()
.findFragmentById(R.id.frag_list);
fragment.onInitiateDiscovery();
manager.discoverPeers(channel, new ActionListener() {
@Override
public void onSuccess() {
Toast.makeText(WiFiDirectActivity.this, "Discovery Initiated",
Toast.LENGTH_SHORT).show();
}
@Override
public void onFailure(int reasonCode) {
Toast.makeText(WiFiDirectActivity.this, "Discovery Failed : " + reasonCode,
Toast.LENGTH_SHORT).show();
}
});
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public void showDetails(WifiP2pDevice device) {
DeviceDetailFragment fragment = (DeviceDetailFragment) getFragmentManager()
.findFragmentById(R.id.frag_detail);
fragment.showDetails(device);
}
@SuppressLint("MissingPermission")
@Override
public void connect(WifiP2pConfig config) {
manager.connect(channel, config, new ActionListener() {
@Override
public void onSuccess() {
// WiFiDirectBroadcastReceiver will notify us. Ignore for now.
}
@Override
public void onFailure(int reason) {
Toast.makeText(WiFiDirectActivity.this, "Connect failed. Retry.",
Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void disconnect() {
final DeviceDetailFragment fragment = (DeviceDetailFragment) getFragmentManager()
.findFragmentById(R.id.frag_detail);
fragment.resetViews();
manager.removeGroup(channel, new ActionListener() {
@Override
public void onFailure(int reasonCode) {
Log.d(TAG, "Disconnect failed. Reason :" + reasonCode);
}
@Override
public void onSuccess() {
fragment.getView().setVisibility(View.GONE);
}
});
}
@Override
public void onChannelDisconnected() {
// we will try once more
if (manager != null && !retryChannel) {
Toast.makeText(this, "Channel lost. Trying again", Toast.LENGTH_LONG).show();
resetData();
retryChannel = true;
manager.initialize(this, getMainLooper(), this);
} else {
Toast.makeText(this,
"Severe! Channel is probably lost premanently. Try Disable/Re-Enable P2P.",
Toast.LENGTH_LONG).show();
}
}
@Override
public void cancelDisconnect() {
/*
* A cancel abort request by user. Disconnect i.e. removeGroup if
* already connected. Else, request WifiP2pManager to abort the ongoing
* request
*/
if (manager != null) {
final DeviceListFragment fragment = (DeviceListFragment) getFragmentManager()
.findFragmentById(R.id.frag_list);
if (fragment.getDevice() == null
|| fragment.getDevice().status == WifiP2pDevice.CONNECTED) {
disconnect();
} else if (fragment.getDevice().status == WifiP2pDevice.AVAILABLE
|| fragment.getDevice().status == WifiP2pDevice.INVITED) {
manager.cancelConnect(channel, new ActionListener() {
@Override
public void onSuccess() {
Toast.makeText(WiFiDirectActivity.this, "Aborting connection",
Toast.LENGTH_SHORT).show();
}
@Override
public void onFailure(int reasonCode) {
Toast.makeText(WiFiDirectActivity.this,
"Connect abort request failed. Reason Code: " + reasonCode,
Toast.LENGTH_SHORT).show();
}
});
}
}
}
@Override
protected void onDestroy() {
super.onDestroy();
}
}
从 android 10 开始，即使用户在 运行 时间授予位置权限，应用程序也不会 run.We 必须手动打开 gps（位置）从设置栏或以编程方式打开设置以打开 gps 然后 运行 app.This 时间只要 gps（位置）打开 discoverPeers() 将 运行 通常没有 errors.Though 在以下设备上不需要 GPS。
我正在尝试 运行 wifip2p 文档页面上提供的 wifidirectdemo 应用程序，但在 android 10 上 运行ning perfectly.I 尝试了 perfectly.I 中提到的解决方案=14=] ，但没有 helped.All 其他 wifip2p 功能通常 运行ning 只有这导致问题和 returns 0 即错误代码。 感谢您的任何建议。
Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.deom">
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<!-- Google Play filtering -->
<uses-feature android:name="android.hardware.wifi.direct" android:required="true"/>
<application android:theme="@android:style/Theme.Holo" android:label="@string/app_name" android:icon="@drawable/ic_launcher">
<activity android:name=".WiFiDirectActivity" android:label="@string/app_name" android:launchMode="singleTask">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<provider
android:name="androidx.core.content.FileProvider"
android:authorities="${applicationId}.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>
<!-- Used for transferring files after a successful connection -->
<service android:name=".FileTransferService" android:enabled="true"/>
</application>
</manifest>
WifiDirectActivity.java
package com.example.deom;
import android.Manifest;
import android.annotation.SuppressLint;
import android.app.Activity;
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.WifiManager;
import android.net.wifi.p2p.WifiP2pConfig;
import android.net.wifi.p2p.WifiP2pDevice;
import android.net.wifi.p2p.WifiP2pManager;
import android.net.wifi.p2p.WifiP2pManager.ActionListener;
import android.net.wifi.p2p.WifiP2pManager.Channel;
import android.net.wifi.p2p.WifiP2pManager.ChannelListener;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
/**
* An activity that uses WiFi Direct APIs to discover and connect with available
* devices. WiFi Direct APIs are asynchronous and rely on callback mechanism
* using interfaces to notify the application of operation success or failure.
* The application should also register a BroadcastReceiver for notification of
* WiFi state related events.
*/
public class WiFiDirectActivity extends Activity implements ChannelListener, DeviceListFragment.DeviceActionListener {
public static final String TAG = "wifidirectdemo";
private static final int PERMISSIONS_REQUEST_CODE_ACCESS_FINE_LOCATION = 1001;
private WifiP2pManager manager;
private boolean isWifiP2pEnabled = false;
private boolean retryChannel = false;
private final IntentFilter intentFilter = new IntentFilter();
private Channel channel;
private BroadcastReceiver receiver = null;
/**
* @param isWifiP2pEnabled the isWifiP2pEnabled to set
*/
public void setIsWifiP2pEnabled(boolean isWifiP2pEnabled) {
this.isWifiP2pEnabled = isWifiP2pEnabled;
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions,
int[] grantResults) {
switch (requestCode) {
case PERMISSIONS_REQUEST_CODE_ACCESS_FINE_LOCATION:
if (grantResults[0] != PackageManager.PERMISSION_GRANTED) {
Log.e(TAG, "Fine location permission is not granted!");
finish();
}
break;
}
}
private boolean initP2p() {
// Device capability definition check
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_WIFI_DIRECT)) {
Log.e(TAG, "Wi-Fi Direct is not supported by this device.");
return false;
}
// Hardware capability check
WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
if (wifiManager == null) {
Log.e(TAG, "Cannot get Wi-Fi system service.");
return false;
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
if (!wifiManager.isP2pSupported()) {
Log.e(TAG, "Wi-Fi Direct is not supported by the hardware or Wi-Fi is off.");
return false;
}
}
manager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);
if (manager == null) {
Log.e(TAG, "Cannot get Wi-Fi Direct system service.");
return false;
}
channel = manager.initialize(this, getMainLooper(), null);
if (channel == null) {
Log.e(TAG, "Cannot initialize Wi-Fi Direct.");
return false;
}
return true;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// add necessary intent values to be matched.
intentFilter.addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION);
intentFilter.addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION);
intentFilter.addAction(WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION);
intentFilter.addAction(WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION);
if (!initP2p()) {
finish();
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
&& checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
WiFiDirectActivity.PERMISSIONS_REQUEST_CODE_ACCESS_FINE_LOCATION);
// After this point you wait for callback in
// onRequestPermissionsResult(int, String[], int[]) overridden method
}
}
/** register the BroadcastReceiver with the intent values to be matched */
@Override
public void onResume() {
super.onResume();
receiver = new WiFiDirectBroadcastReceiver(manager, channel, this);
registerReceiver(receiver, intentFilter);
}
@Override
public void onPause() {
super.onPause();
unregisterReceiver(receiver);
}
/**
* Remove all peers and clear all fields. This is called on
* BroadcastReceiver receiving a state change event.
*/
public void resetData() {
DeviceListFragment fragmentList = (DeviceListFragment) getFragmentManager()
.findFragmentById(R.id.frag_list);
DeviceDetailFragment fragmentDetails = (DeviceDetailFragment) getFragmentManager()
.findFragmentById(R.id.frag_detail);
if (fragmentList != null) {
fragmentList.clearPeers();
}
if (fragmentDetails != null) {
fragmentDetails.resetViews();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.action_items, menu);
return true;
}
/*
* (non-Javadoc)
* @see android.app.Activity#onOptionsItemSelected(android.view.MenuItem)
*/
@SuppressLint("MissingPermission")
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.atn_direct_enable:
if (manager != null && channel != null) {
// Since this is the system wireless settings activity, it's
// not going to send us a result. We will be notified by
// WiFiDeviceBroadcastReceiver instead.
startActivity(new Intent(Settings.ACTION_WIRELESS_SETTINGS));
} else {
Log.e(TAG, "channel or manager is null");
}
return true;
case R.id.atn_direct_discover:
if (!isWifiP2pEnabled) {
Toast.makeText(WiFiDirectActivity.this, R.string.p2p_off_warning,
Toast.LENGTH_SHORT).show();
return true;
}
final DeviceListFragment fragment = (DeviceListFragment) getFragmentManager()
.findFragmentById(R.id.frag_list);
fragment.onInitiateDiscovery();
manager.discoverPeers(channel, new ActionListener() {
@Override
public void onSuccess() {
Toast.makeText(WiFiDirectActivity.this, "Discovery Initiated",
Toast.LENGTH_SHORT).show();
}
@Override
public void onFailure(int reasonCode) {
Toast.makeText(WiFiDirectActivity.this, "Discovery Failed : " + reasonCode,
Toast.LENGTH_SHORT).show();
}
});
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public void showDetails(WifiP2pDevice device) {
DeviceDetailFragment fragment = (DeviceDetailFragment) getFragmentManager()
.findFragmentById(R.id.frag_detail);
fragment.showDetails(device);
}
@SuppressLint("MissingPermission")
@Override
public void connect(WifiP2pConfig config) {
manager.connect(channel, config, new ActionListener() {
@Override
public void onSuccess() {
// WiFiDirectBroadcastReceiver will notify us. Ignore for now.
}
@Override
public void onFailure(int reason) {
Toast.makeText(WiFiDirectActivity.this, "Connect failed. Retry.",
Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void disconnect() {
final DeviceDetailFragment fragment = (DeviceDetailFragment) getFragmentManager()
.findFragmentById(R.id.frag_detail);
fragment.resetViews();
manager.removeGroup(channel, new ActionListener() {
@Override
public void onFailure(int reasonCode) {
Log.d(TAG, "Disconnect failed. Reason :" + reasonCode);
}
@Override
public void onSuccess() {
fragment.getView().setVisibility(View.GONE);
}
});
}
@Override
public void onChannelDisconnected() {
// we will try once more
if (manager != null && !retryChannel) {
Toast.makeText(this, "Channel lost. Trying again", Toast.LENGTH_LONG).show();
resetData();
retryChannel = true;
manager.initialize(this, getMainLooper(), this);
} else {
Toast.makeText(this,
"Severe! Channel is probably lost premanently. Try Disable/Re-Enable P2P.",
Toast.LENGTH_LONG).show();
}
}
@Override
public void cancelDisconnect() {
/*
* A cancel abort request by user. Disconnect i.e. removeGroup if
* already connected. Else, request WifiP2pManager to abort the ongoing
* request
*/
if (manager != null) {
final DeviceListFragment fragment = (DeviceListFragment) getFragmentManager()
.findFragmentById(R.id.frag_list);
if (fragment.getDevice() == null
|| fragment.getDevice().status == WifiP2pDevice.CONNECTED) {
disconnect();
} else if (fragment.getDevice().status == WifiP2pDevice.AVAILABLE
|| fragment.getDevice().status == WifiP2pDevice.INVITED) {
manager.cancelConnect(channel, new ActionListener() {
@Override
public void onSuccess() {
Toast.makeText(WiFiDirectActivity.this, "Aborting connection",
Toast.LENGTH_SHORT).show();
}
@Override
public void onFailure(int reasonCode) {
Toast.makeText(WiFiDirectActivity.this,
"Connect abort request failed. Reason Code: " + reasonCode,
Toast.LENGTH_SHORT).show();
}
});
}
}
}
@Override
protected void onDestroy() {
super.onDestroy();
}
}
从 android 10 开始，即使用户在 运行 时间授予位置权限，应用程序也不会 run.We 必须手动打开 gps（位置）从设置栏或以编程方式打开设置以打开 gps 然后 运行 app.This 时间只要 gps（位置）打开 discoverPeers() 将 运行 通常没有 errors.Though 在以下设备上不需要 GPS。