Fix leaked decor view (#115)

Author: SUPERCILEX

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

@@ -119,14 +119,13 @@ public void show() {
     /**
      * Show the dialog. {@link #show()} is a wrapper to ensure backwards compatibility
      */
-    void showDialog() {
-        new AlertDialog.Builder(mContext)
+    AlertDialog showDialog() {
+        return new AlertDialog.Builder(mContext)
                 .setCancelable(false)
                 .setTitle(mTitle)
                 .setMessage(mRationale)
                 .setPositiveButton(mPositiveButtonText, this)
                 .setNegativeButton(mNegativeButtonText, mNegativeListener)
-                .create()
                 .show();
     }
 

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

@@ -6,10 +6,13 @@
 import android.content.Intent;
 import android.os.Bundle;
 import android.support.annotation.RestrictTo;
+import android.support.v7.app.AlertDialog;
 import android.support.v7.app.AppCompatActivity;
 
 @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)
 public class AppSettingsDialogHolderActivity extends AppCompatActivity implements DialogInterface.OnClickListener {
+    private AlertDialog mDialog;
+
     public static Intent createShowDialogIntent(Context context, AppSettingsDialog dialog) {
         return new Intent(context, AppSettingsDialogHolderActivity.class)
                 .putExtra(AppSettingsDialog.EXTRA_APP_SETTINGS, dialog);
@@ -22,7 +25,15 @@ protected void onCreate(Bundle savedInstanceState) {
         dialog.setContext(this);
         dialog.setActivityOrFragment(this);
         dialog.setNegativeListener(this);
-        dialog.showDialog();
+        mDialog = dialog.showDialog();
+    }
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        if (mDialog != null && mDialog.isShowing()) {
+            mDialog.dismiss();
+        }
     }
 
     @Override