- add TabManager (based on the Fragment Tabs example in

API 4+ Support Demos) - move to MapFragment, ChartFragment, and StatsFragment - use android-support-v4-r7-googlemaps.jar to support a map view in a fragment.
2012-04-05 16:55:22 -07:00
parent 12f17e6f49
commit 32e8044b0b
35 changed files with 1776 additions and 2035 deletions
@@ -0,0 +1,130 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * 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.google.android.apps.mytracks;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentActivity;
+import android.support.v4.app.FragmentTransaction;
+import android.view.View;
+import android.widget.TabHost;
+
+import java.util.HashMap;
+
+/**
+ * This is a helper class that implements a generic mechanism for associating
+ * fragments with the tabs in a tab host. It relies on a trick. Normally a tab
+ * host has a simple API for supplying a View or Intent that each tab will show.
+ * This is not sufficient for switching between fragments. So instead we make
+ * the content part of the tab host 0dp high (it is not shown) and the
+ * TabManager supplies its own dummy view to show as the tab content. It listens
+ * to changes in tabs, and takes care of switch to the correct fragment shown in
+ * a separate content area whenever the selected tab changes.
+ * 
+ * Copied from the Fragment Tabs example in the API 4+ Support Demos. 
+ * 
+ * @author Jimmy Shih
+ */
+public class TabManager implements TabHost.OnTabChangeListener {
+  private final FragmentActivity mActivity;
+  private final TabHost mTabHost;
+  private final int mContainerId;
+  private final HashMap<String, TabInfo> mTabs = new HashMap<String, TabInfo>();
+  TabInfo mLastTab;
+
+  static final class TabInfo {
+    private final String tag;
+    private final Class<?> clss;
+    private final Bundle args;
+    private Fragment fragment;
+
+    TabInfo(String _tag, Class<?> _class, Bundle _args) {
+      tag = _tag;
+      clss = _class;
+      args = _args;
+    }
+  }
+
+  static class DummyTabFactory implements TabHost.TabContentFactory {
+    private final Context mContext;
+
+    public DummyTabFactory(Context context) {
+      mContext = context;
+    }
+
+    @Override
+    public View createTabContent(String tag) {
+      View v = new View(mContext);
+      v.setMinimumWidth(0);
+      v.setMinimumHeight(0);
+      return v;
+    }
+  }
+
+  public TabManager(FragmentActivity activity, TabHost tabHost, int containerId) {
+    mActivity = activity;
+    mTabHost = tabHost;
+    mContainerId = containerId;
+    mTabHost.setOnTabChangedListener(this);
+  }
+
+  public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args) {
+    tabSpec.setContent(new DummyTabFactory(mActivity));
+    String tag = tabSpec.getTag();
+
+    TabInfo info = new TabInfo(tag, clss, args);
+
+    // Check to see if we already have a fragment for this tab, probably
+    // from a previously saved state. If so, deactivate it, because our
+    // initial state is that a tab isn't shown.
+    info.fragment = mActivity.getSupportFragmentManager().findFragmentByTag(tag);
+    if (info.fragment != null && !info.fragment.isDetached()) {
+      FragmentTransaction ft = mActivity.getSupportFragmentManager().beginTransaction();
+      ft.detach(info.fragment);
+      ft.commit();
+    }
+
+    mTabs.put(tag, info);
+    mTabHost.addTab(tabSpec);
+  }
+
+  @Override
+  public void onTabChanged(String tabId) {
+    TabInfo newTab = mTabs.get(tabId);
+    if (mLastTab != newTab) {
+      FragmentTransaction ft = mActivity.getSupportFragmentManager().beginTransaction();
+      if (mLastTab != null) {
+        if (mLastTab.fragment != null) {
+          ft.detach(mLastTab.fragment);
+        }
+      }
+      if (newTab != null) {
+        if (newTab.fragment == null) {
+          newTab.fragment = Fragment.instantiate(mActivity, newTab.clss.getName(), newTab.args);
+          ft.add(mContainerId, newTab.fragment, newTab.tag);
+        } else {
+          ft.attach(newTab.fragment);
+        }
+      }
+
+      mLastTab = newTab;
+      ft.commit();
+      mActivity.getSupportFragmentManager().executePendingTransactions();
+    }
+  }
+}