cross-port of WebViewFragment to Support Library

NFC/WebBeam/app/src/main/java/com/commonsware/android/webbeam/WebViewFragment.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ * Modifications (c) 2018 CommonsWare, LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.commonsware.android.webbeam;
+
+import android.os.Bundle;
+import android.support.v4.app.Fragment;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.webkit.WebView;
+
+/**
+ * A fragment that displays a WebView.
+ * <p>
+ * The WebView is automically paused or resumed when the Fragment is paused or resumed.
+ */
+public class WebViewFragment extends Fragment {
+  private WebView mWebView;
+  private boolean mIsWebViewAvailable;
+
+  public WebViewFragment() {
+  }
+
+  /**
+   * Called to instantiate the view. Creates and returns the WebView.
+   */
+  @Override
+  public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                           Bundle savedInstanceState) {
+    if (mWebView != null) {
+      mWebView.destroy();
+    }
+    mWebView = new WebView(getContext());
+    mIsWebViewAvailable = true;
+    return mWebView;
+  }
+
+  /**
+   * Called when the fragment is visible to the user and actively running. Resumes the WebView.
+   */
+  @Override
+  public void onPause() {
+    super.onPause();
+    mWebView.onPause();
+  }
+
+  /**
+   * Called when the fragment is no longer resumed. Pauses the WebView.
+   */
+  @Override
+  public void onResume() {
+    mWebView.onResume();
+    super.onResume();
+  }
+
+  /**
+   * Called when the WebView has been detached from the fragment.
+   * The WebView is no longer available after this time.
+   */
+  @Override
+  public void onDestroyView() {
+    mIsWebViewAvailable = false;
+    super.onDestroyView();
+  }
+
+  /**
+   * Called when the fragment is no longer in use. Destroys the internal state of the WebView.
+   */
+  @Override
+  public void onDestroy() {
+    if (mWebView != null) {
+      mWebView.destroy();
+      mWebView = null;
+    }
+    super.onDestroy();
+  }
+
+  /**
+   * Gets the WebView.
+   */
+  public WebView getWebView() {
+    return mIsWebViewAvailable ? mWebView : null;
+  }
+}