add autoRequestPermission() API

app/src/main/java/pub/devrel/easypermissions/sample/MainActivity.java

@@ -16,6 +16,7 @@
 package pub.devrel.easypermissions.sample;
 
 import android.Manifest;
+import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
@@ -39,12 +40,13 @@ public class MainActivity extends AppCompatActivity implements EasyPermissions.P
 
     private static final int RC_CAMERA_PERM = 123;
     private static final int RC_LOCATION_CONTACTS_PERM = 124;
+    private Context mContext;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
-
+        mContext = this;
         // Button click listener that will request one permission.
         findViewById(R.id.button_camera).setOnClickListener(new View.OnClickListener() {
             @Override
@@ -80,17 +82,18 @@ private boolean hasStoragePermission() {
 
     @AfterPermissionGranted(RC_CAMERA_PERM)
     public void cameraTask() {
-        if (hasCameraPermission()) {
-            // Have permission, do the thing!
-            Toast.makeText(this, "TODO: Camera things", Toast.LENGTH_LONG).show();
-        } else {
-            // Ask for one permission
-            EasyPermissions.requestPermissions(
-                    this,
-                    getString(R.string.rationale_camera),
-                    RC_CAMERA_PERM,
-                    Manifest.permission.CAMERA);
-        }
+        EasyPermissions.autoRequestPermission(
+                this,
+                new EasyPermissions.AutoRequestPermissionCallbacks() {
+                        @Override
+                        public void onAutoRequestPermissionGranted() {
+                            // Have permission, do the thing!
+                            Toast.makeText(mContext, "TODO: Camera things", Toast.LENGTH_LONG).show();
+                        }
+                    },
+                getString(R.string.rationale_camera),
+                RC_CAMERA_PERM,
+                Manifest.permission.CAMERA);
     }
 
     @AfterPermissionGranted(RC_LOCATION_CONTACTS_PERM)

easypermissions/src/main/java/pub/devrel/easypermissions/EasyPermissions.java

@@ -64,6 +64,57 @@ public interface RationaleCallbacks {
 
     private static final String TAG = "EasyPermissions";
 
+
+    /**
+     * @see #autoRequestPermission( Fragment, AutoRequestPermissionCallbacks,
+     *     String,int,String...)
+     */
+    public static void autoRequestPermission(
+            @NonNull Activity host,
+            @NonNull AutoRequestPermissionCallbacks autoRequestPermissionCallbacks,
+            @NonNull String rationale,
+            int requestCode,
+            @Size(min = 1) @NonNull String... perms) {
+        if (EasyPermissions.hasPermissions(host, perms)) {
+            autoRequestPermissionCallbacks.onAutoRequestPermissionGranted();
+        } else {
+            // Ask for permission you need
+            EasyPermissions.requestPermissions(host, rationale, requestCode, perms);
+        }
+    }
+
+    /**
+     * auto request permission if app don't have the permission you need.
+     *
+     * @param host requesting context.
+     * @param autoRequestPermissionCallbacks the call back receive the result
+     * @param rationale a message explaining why the application needs this set of permissions, will
+     *     be displayed if the user rejects the request the first time.
+     * @param requestCode request code to track this request, must be < 256.
+     * @param perms one ore more permissions, such as {@link Manifest.permission#CAMERA}.
+     */
+    public static void autoRequestPermission(
+            @NonNull Fragment host,
+            @NonNull AutoRequestPermissionCallbacks autoRequestPermissionCallbacks,
+            @NonNull String rationale,
+            int requestCode,
+            @Size(min = 1) @NonNull String... perms) {
+        if (EasyPermissions.hasPermissions(host.getContext(), perms)) {
+            autoRequestPermissionCallbacks.onAutoRequestPermissionGranted();
+        } else {
+            // Ask for permission you need
+            EasyPermissions.requestPermissions(host, rationale, requestCode, perms);
+        }
+    }
+
+    /**
+     * Callback interface to receive granted event of {@code EasyPermissions.autoRequestPermission()}
+     * calls.
+     */
+    public interface AutoRequestPermissionCallbacks {
+        void onAutoRequestPermissionGranted();
+    }
+
     /**
      * Check if the calling context has a set of permissions.
      *