Android Studio 中 LocationManager 的 CheckPermissions 错误

Question

我有一个很好的 GetGeoLocation 应用程序，适用于 API 级别 23（使用 checkSelfPermission）。但是，我不得不让它与 API 级别 21 兼容。因此，checkSelfPermission 没有工作，因为它是在 API 级别 23 中引入的。

所以，我更改了代码以适应这个：

 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    CheckForCoarseLocationPermission();

}
private void CheckForCoarseLocationPermission()
{
    if (android.os.Build.VERSION.SDK_INT >= 23)
    {
        // ANDROID 6.0 AND UP!
        boolean accessCoarseLocationAllowed = false;
        try
        {
            // Invoke checkSelfPermission method from Android 6 (API 23 and UP)
            java.lang.reflect.Method methodCheckPermission = Activity.class.getMethod("checkSelfPermission", java.lang.String.class);
            Object resultObj = methodCheckPermission.invoke(this, Manifest.permission.ACCESS_COARSE_LOCATION);
            int result = Integer.parseInt(resultObj.toString());
            if (result == PackageManager.PERMISSION_GRANTED)
            {
                accessCoarseLocationAllowed = true;


            }
        }
        catch (Exception ex)
        {
        }
        if (accessCoarseLocationAllowed)
        {
            Log.v("TAG","Granted");
            LocationManager locationManager=    (LocationManager)getSystemService(Context.LOCATION_SERVICE);
                locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,new LocationListener());//ERROR Happening Here!!!!!!!!!!!
        }
        try
        {
            // We have to invoke the method "void requestPermissions (Activity activity, String[] permissions, int requestCode) "
            // from android 6
            java.lang.reflect.Method methodRequestPermission = Activity.class.getMethod("requestPermissions", java.lang.String[].class, int.class);
            methodRequestPermission.invoke(this, new String[]
                    {
                            Manifest.permission.ACCESS_FINE_LOCATION
                    }, 0x12345);
        }
        catch (Exception ex)
        {
        }
    }
}

现在，LocationManager.requestLocationUpdate 出错了 调用需要可能被用户拒绝的权限：代码应该明确检查权限是否可用（使用 checkPermission）或明确处理潜在的 SecurityException less

如果我想为 API 级别 >=21 使用 LocationManager 和 CheckPermission，如何解决它。

请帮忙。

Answer 1

你可以把Support library放在这里使用，

if(android.support.v4.content.PermissionChecker.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED)
        {
...
         }

Answer 2

试试这个

if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) { // coarse permission is granted
            // Todo
} else { // permission is not granted, request for permission
    if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_COARSE_LOCATION)) { // show some info to user why you want this permission
       Toast.makeText(this, "Allow Location Permission to use this functionality.", Toast.LENGTH_SHORT).show();
       ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, 123 /*LOCATION_PERMISSION_REQUEST_CODE*/);
    } else {
       ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, 123 /*LOCATION_PERMISSION_REQUEST_CODE*/);

    }
}

注意：- 您必须在 android 清单中具有以下权限

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

Android Studio 中 LocationManager 的 CheckPermissions 错误

CheckPermissions Error for LocationManager in Android Studio

android

geolocation

locationmanager

android-6.0-marshmallow

android-api-levels