我使用下面的代码根据用户打开/关闭网络和gps的时间来更改两个文本视图。我可以让网络文本视图工作,但不能让位置文本视图工作。我想我用错了过滤器,但我不知道该用哪个来代替。有什么建议/答案吗?
public class MainActivity extends AppCompatActivity {
TextView networkTextView;
TextView locationTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
networkTextView = findViewById(R.id.networkTextView);
locationTextView = findViewById(R.id.locationTextView);
IntentFilter filter1 = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(broadcastReceiver1, filter1);
IntentFilter filter2 = new IntentFilter(LocationManager.PROVIDERS_CHANGED_ACTION);
registerReceiver(broadcastReceiver2, filter2);
}
BroadcastReceiver broadcastReceiver1 = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {
boolean noNetworkConnectivity = intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, false);
if (noNetworkConnectivity) {
networkTextView.setText("Disconnected");
} else {
networkTextView.setText("Connected");
}
}
}
};
BroadcastReceiver broadcastReceiver2 = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (LocationManager.PROVIDERS_CHANGED_ACTION.equals(intent.getAction())) {
boolean noLocationConnectivity = intent.getBooleanExtra(LocationManager.PROVIDERS_CHANGED_ACTION, false);
if (noLocationConnectivity) {
locationTextView.setText("Disconnected");
} else {
locationTextView.setText("Connected");
}
}
}
};
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(broadcastReceiver1);
unregisterReceiver(broadcastReceiver2);
}
}
更新:
在广播接收器里找到我替换的位置
boolean noLocationConnectivity = intent.getBooleanExtra(LocationManager.PROVIDERS_CHANGED_ACTION, false);
具有
LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
boolean locationConnectivity = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
但那没用。可能需要向用户请求位置数据权限?
更新2:
意识到它正在注册locationmanager.gps\u提供程序的布尔更改,但不是最初的更改。只有在应用程序启动后手动更改位置设置,文本才会更改,这与网络检查不同,网络检查会在应用程序启动后立即更改文本。
~已解决:
必须调用以下代码两次。一次在接收器外面,然后在接收器里面。但仍不清楚为什么它一开始无法识别定位服务是开着还是关着。
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
boolean locationConnectivity = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (locationConnectivity) {
locationTextView.setText("Connected");
} else {
locationTextView.setText("Disconnected");
}
1条答案
按热度按时间hfyxw5xn1#
我想这个问题已经在这里得到了回答
但我想如果你用
LocationManager
以及LocationListener
是不是个好主意,我是说,LocationListener
已重写这些方法:我让你考虑一下