许多人已经提出过这个问题,但是对他们有效的解决方案并不适用于我。我已在Android 8.1和Android 9.0上测试过,无法获取SSID的名称。
用于获取WiFi状态变化的广播接收器:
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if(intent.getAction().equals(WifiManager.WIFI_STATE_CHANGED_ACTION) ||
intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION) ||
intent.getAction().equals(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION) ||
intent.getAction().equals(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION) ||
intent.getAction().equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)) {
setWifiIndicator();
}
}
};
接收器已注册onCreate
并在onDestroy
中未注册,我认为这是正确的,我在接收器被调用时看到了日志行。
在onCreate
:
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(ScannerService.ACTION_READ_SCANNER);
intentFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
intentFilter.addAction(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION);
intentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
intentFilter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);
registerReceiver(mReceiver, intentFilter);
setWifiIndicator();
setWifiIndicator
如此实施:
private void setWifiIndicator() {
ConnectivityManager connMgr = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
//getApplicationContext solves memory leak issues prior to Android N (must use Application Context to get wifi system service.
WifiManager wifiMgr = (WifiManager)getApplicationContext().getSystemService(Context.WIFI_SERVICE);
ImageView wifiIndicator = (ImageView)findViewById(R.id.wifi_indicator);
TextView wifiSSID = (TextView)findViewById(R.id.wifi_ssid);
try {
if (wifiMgr != null) {
if (wifiMgr.isWifiEnabled()) {
//wifi is enabled. toggle on wifi indicator.
wifiIndicator.setImageResource(R.drawable.wifi_indicator);
String ssid = wifiMgr.getConnectionInfo().getSSID();
if (ssid != null) {
Log.v(this.getClass().getSimpleName(), "SSID: " + ssid + " Supplicant State: " + info.getSupplicantState());
wifiSSID.setText(ssid);
}
} else {
//wifi is disabled. toggle off wifi indicator.
wifiSSID.setText("");
//check for 3G
NetworkInfo mobileInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
if (mobileInfo != null && mobileInfo.getState().equals(NetworkInfo.State.CONNECTED)) {
wifiIndicator.setImageResource(R.drawable.cellular_indicator);
} else {
wifiIndicator.setImageResource(R.drawable.down_indicator);
}
}
} else {
//check for 3G
NetworkInfo mobileInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
if (mobileInfo != null && mobileInfo.getState().equals(NetworkInfo.State.CONNECTED)) {
wifiIndicator.setImageResource(R.drawable.cellular_indicator);
} else {
wifiIndicator.setImageResource(R.drawable.down_indicator);
}
}
} catch(Exception e) {
//catching anything thrown in this block just so it doesn't crash the program unnecessarily
e.printStackTrace();
}
}
我的应用程序已获得qazxsw poi的许可,但我还添加了qazxsw poi以防万一。 ACCESS_COARSE_LOCATION
直到返回ACCESS_FINE_LOCATION
。
getSSID()
也许它与编译目标SDK有关?我在这里真的很无能为力。
gradle文件:
apply plugin:'com.android.application'
<unknown ssid>
你有没有试过检查<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.GET_TASKS" />
是否是android {
compileSdkVersion 28
defaultConfig {
applicationId "com.noneofyour.business"
minSdkVersion 15
targetSdkVersion 28
versionCode 59
versionName "1.44"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:28.0.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation files('libs/android.jar')
}
?
getSupplicantState()
另外,你有没有在运行COMPLETED
之前问过这个问题,甚至在里面你可以这样做:
if(wifiInfo.getSupplicantState() == SupplicantState.COMPLETED){
String ssid = wifiInfo.getSSID();
wifiSSID.setText(ssid);
}