如何在不抛出SecurityException的情况下在运行时检查权限？

我devise了一个函数，可以从SD中获取/设置一个资源，如果没有从sd中find资源，则从资产中获取资源，如果可能，将资产写回SD
这个函数可以通过方法调用来检查SD是否被挂载并可访问。

boolean bSDisAvalaible = Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED); 

我devise的function可以使用从一个应用程序（项目）到另一个（有或没有android.permission.WRITE_EXTERNAL_STORAGE）

然后我想检查当前的应用程序是否有这个特殊的权限，而不玩SecurityException。

它是否存在一个“很好”的方式在运行时查询当前定义的权限？

Answer 1

您可以使用Context.checkCallingorSelfPermission()函数。 这里是一个例子：

 private boolean checkWriteExternalPermission() { String permission = "android.permission.WRITE_EXTERNAL_STORAGE"; int res = getContext().checkCallingOrSelfPermission(permission); return (res == PackageManager.PERMISSION_GRANTED); } 

Answer 2

这也是另一个解决scheme

 PackageManager pm = context.getPackageManager(); int hasPerm = pm.checkPermission( android.Manifest.permission.WRITE_EXTERNAL_STORAGE, context.getPackageName()); if (hasPerm != PackageManager.PERMISSION_GRANTED) { // do stuff } 

Answer 3

你也可以使用这个：

 private boolean doesUserHavePermission() { int result = context.checkCallingOrSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE); return result == PackageManager.PERMISSION_GRANTED; } 

Answer 4

像Google 文档一样：

 // Assume thisActivity is the current activity int permissionCheck = ContextCompat.checkSelfPermission(thisActivity, Manifest.permission.WRITE_EXTERNAL_STORAGE); 

Answer 5

如果有人需要，分享我的方法：

  /** Determines if the context calling has the required permission * @param context - the IPC context * @param permissions - The permissions to check * @return true if the IPC has the granted permission */ public static boolean hasPermission(Context context, String permission) { int res = context.checkCallingOrSelfPermission(permission); Log.v(TAG, "permission: " + permission + " = \t\t" + (res == PackageManager.PERMISSION_GRANTED ? "GRANTED" : "DENIED")); return res == PackageManager.PERMISSION_GRANTED; } /** Determines if the context calling has the required permissions * @param context - the IPC context * @param permissions - The permissions to check * @return true if the IPC has the granted permission */ public static boolean hasPermissions(Context context, String... permissions) { boolean hasAllPermissions = true; for(String permission : permissions) { //you can return false instead of assigning, but by assigning you can log all permission values if (! hasPermission(context, permission)) {hasAllPermissions = false; } } return hasAllPermissions; } 

并称之为：

 boolean hasAndroidPermissions = SystemUtils.hasPermissions(mContext, new String[] { android.Manifest.permission.ACCESS_WIFI_STATE, android.Manifest.permission.READ_PHONE_STATE, android.Manifest.permission.ACCESS_NETWORK_STATE, android.Manifest.permission.INTERNET, }); 

Answer 6

您应该按照以下方式检查权限（如此处所述的Android权限 ）：

 int result = ContextCompat.checkSelfPermission(getContext(), Manifest.permission.READ_PHONE_STATE); 

那么，比较你的结果：

 result == PackageManager.PERMISSION_DENIED 

要么：

 result == PackageManager.PERMISSION_GRANTED 

Answer 7

对我来说工作正常的代码是：

  final int MY_PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE = 102; if ((ContextCompat.checkSelfPermission(getActivity(),Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)) { requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, MY_PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE); } else { // user already provided permission // perform function for what you want to achieve } @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { boolean canUseExternalStorage = false; switch (requestCode) { case MY_PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE: { if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { canUseExternalStorage = true; } if (!canUseExternalStorage) { Toast.makeText(getActivity(), "Cannot use this feature without requested permission", Toast.LENGTH_SHORT).show(); } else { // user now provided permission // perform function for what you want to achieve } } } } 

Answer 8

启用GPS位置Android Studio

1. 在AndroidManifest.Xml中添加权限条目

2. MapsActivity.java

    public class MapsActivity extends FragmentActivity implements OnMapReadyCallback { private GoogleMap mMap; private Context context; private static final int PERMISSION_REQUEST_CODE = 1; Activity activity; /** * ATTENTION: This was auto-generated to implement the App Indexing API. * See https://g.co/AppIndexing/AndroidStudio for more information. */ private GoogleApiClient client; @Override protected void onCreate(Bundle savedInstanceState) { context = getApplicationContext(); activity = this; super.onCreate(savedInstanceState); requestPermission(); checkPermission(); setContentView(R.layout.activity_maps); // Obtain the SupportMapFragment and get notified when the map is ready to be used. SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager() .findFragmentById(R.id.map); mapFragment.getMapAsync(this); } @Override public void onMapReady(GoogleMap googleMap) { mMap = googleMap; LatLng location = new LatLng(0, 0); mMap.addMarker(new MarkerOptions().position(location).title("Marker in Bangalore")); mMap.moveCamera(CameraUpdateFactory.newLatLng(location)); mMap.setMyLocationEnabled(true); } private void requestPermission() { if (ActivityCompat.shouldShowRequestPermissionRationale(activity, Manifest.permission.ACCESS_FINE_LOCATION)) { Toast.makeText(context, "GPS permission allows us to access location data. Please allow in App Settings for additional functionality.", Toast.LENGTH_LONG).show(); } else { ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, PERMISSION_REQUEST_CODE); } } private boolean checkPermission() { int result = ContextCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION); if (result == PackageManager.PERMISSION_GRANTED) { return true; } else { return false; } }