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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.apis.app;
     18 
     19 import com.example.android.apis.R;
     20 
     21 import android.app.Activity;
     22 import android.app.Fragment;
     23 import android.app.FragmentManager;
     24 import android.app.FragmentTransaction;
     25 import android.os.Bundle;
     26 import android.view.LayoutInflater;
     27 import android.view.View;
     28 import android.view.ViewGroup;
     29 import android.view.View.OnClickListener;
     30 import android.widget.Button;
     31 import android.widget.TextView;
     32 
     33 /**
     34  * Demonstration of hiding and showing fragments.
     35  */
     36 public class FragmentHideShow extends Activity {
     37 
     38     @Override
     39     protected void onCreate(Bundle savedInstanceState) {
     40         super.onCreate(savedInstanceState);
     41         setContentView(R.layout.fragment_hide_show);
     42 
     43         // The content view embeds two fragments; now retrieve them and attach
     44         // their "hide" button.
     45         FragmentManager fm = getFragmentManager();
     46         addShowHideListener(R.id.frag1hide, fm.findFragmentById(R.id.fragment1));
     47         addShowHideListener(R.id.frag2hide, fm.findFragmentById(R.id.fragment2));
     48     }
     49 
     50     void addShowHideListener(int buttonId, final Fragment fragment) {
     51         final Button button = (Button)findViewById(buttonId);
     52         button.setOnClickListener(new OnClickListener() {
     53             public void onClick(View v) {
     54                 FragmentTransaction ft = getFragmentManager().beginTransaction();
     55                 ft.setCustomAnimations(android.R.animator.fade_in,
     56                         android.R.animator.fade_out);
     57                 if (fragment.isHidden()) {
     58                     ft.show(fragment);
     59                     button.setText("Hide");
     60                 } else {
     61                     ft.hide(fragment);
     62                     button.setText("Show");
     63                 }
     64                 ft.commit();
     65             }
     66         });
     67     }
     68 
     69     public static class FirstFragment extends Fragment {
     70         TextView mTextView;
     71 
     72         @Override
     73         public View onCreateView(LayoutInflater inflater, ViewGroup container,
     74                 Bundle savedInstanceState) {
     75             View v = inflater.inflate(R.layout.labeled_text_edit, container, false);
     76             View tv = v.findViewById(R.id.msg);
     77             ((TextView)tv).setText("The fragment saves and restores this text.");
     78 
     79             // Retrieve the text editor, and restore the last saved state if needed.
     80             mTextView = (TextView)v.findViewById(R.id.saved);
     81             if (savedInstanceState != null) {
     82                 mTextView.setText(savedInstanceState.getCharSequence("text"));
     83             }
     84             return v;
     85         }
     86 
     87         @Override
     88         public void onSaveInstanceState(Bundle outState) {
     89             super.onSaveInstanceState(outState);
     90 
     91             // Remember the current text, to restore if we later restart.
     92             outState.putCharSequence("text", mTextView.getText());
     93         }
     94     }
     95 
     96     public static class SecondFragment extends Fragment {
     97 
     98         @Override
     99         public View onCreateView(LayoutInflater inflater, ViewGroup container,
    100                 Bundle savedInstanceState) {
    101             View v = inflater.inflate(R.layout.labeled_text_edit, container, false);
    102             View tv = v.findViewById(R.id.msg);
    103             ((TextView)tv).setText("The TextView saves and restores this text.");
    104 
    105             // Retrieve the text editor and tell it to save and restore its state.
    106             // Note that you will often set this in the layout XML, but since
    107             // we are sharing our layout with the other fragment we will customize
    108             // it here.
    109             ((TextView)v.findViewById(R.id.saved)).setSaveEnabled(true);
    110             return v;
    111         }
    112     }
    113 }
    114