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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.FragmentTransaction;
     24 import android.os.Bundle;
     25 import android.view.LayoutInflater;
     26 import android.view.View;
     27 import android.view.ViewGroup;
     28 import android.view.View.OnClickListener;
     29 import android.widget.Button;
     30 import android.widget.TextView;
     31 
     32 /**
     33  * Demonstrates the use of custom animations in a FragmentTransaction when
     34  * pushing and popping a stack.
     35  */
     36 public class FragmentCustomAnimations extends Activity {
     37     int mStackLevel = 1;
     38 
     39     @Override
     40     protected void onCreate(Bundle savedInstanceState) {
     41         super.onCreate(savedInstanceState);
     42         setContentView(R.layout.fragment_stack);
     43 
     44         // Watch for button clicks.
     45         Button button = (Button)findViewById(R.id.new_fragment);
     46         button.setOnClickListener(new OnClickListener() {
     47             public void onClick(View v) {
     48                 addFragmentToStack();
     49             }
     50         });
     51 
     52         if (savedInstanceState == null) {
     53             // Do first time initialization -- add initial fragment.
     54             Fragment newFragment = CountingFragment.newInstance(mStackLevel);
     55             FragmentTransaction ft = getFragmentManager().beginTransaction();
     56             ft.add(R.id.simple_fragment, newFragment).commit();
     57         } else {
     58             mStackLevel = savedInstanceState.getInt("level");
     59         }
     60     }
     61 
     62     @Override
     63     public void onSaveInstanceState(Bundle outState) {
     64         super.onSaveInstanceState(outState);
     65         outState.putInt("level", mStackLevel);
     66     }
     67 
     68 //BEGIN_INCLUDE(add_stack)
     69     void addFragmentToStack() {
     70         mStackLevel++;
     71 
     72         // Instantiate a new fragment.
     73         Fragment newFragment = CountingFragment.newInstance(mStackLevel);
     74 
     75         // Add the fragment to the activity, pushing this transaction
     76         // on to the back stack.
     77         FragmentTransaction ft = getFragmentManager().beginTransaction();
     78         ft.setCustomAnimations(R.animator.fragment_slide_left_enter,
     79                 R.animator.fragment_slide_left_exit,
     80                 R.animator.fragment_slide_right_enter,
     81                 R.animator.fragment_slide_right_exit);
     82         ft.replace(R.id.simple_fragment, newFragment);
     83         ft.addToBackStack(null);
     84         ft.commit();
     85     }
     86 //END_INCLUDE(add_stack)
     87 
     88 //BEGIN_INCLUDE(fragment)
     89     public static class CountingFragment extends Fragment {
     90         int mNum;
     91 
     92         /**
     93          * Create a new instance of CountingFragment, providing "num"
     94          * as an argument.
     95          */
     96         static CountingFragment newInstance(int num) {
     97             CountingFragment f = new CountingFragment();
     98 
     99             // Supply num input as an argument.
    100             Bundle args = new Bundle();
    101             args.putInt("num", num);
    102             f.setArguments(args);
    103 
    104             return f;
    105         }
    106 
    107         /**
    108          * When creating, retrieve this instance's number from its arguments.
    109          */
    110         @Override
    111         public void onCreate(Bundle savedInstanceState) {
    112             super.onCreate(savedInstanceState);
    113             mNum = getArguments() != null ? getArguments().getInt("num") : 1;
    114         }
    115 
    116         /**
    117          * The Fragment's UI is just a simple text view showing its
    118          * instance number.
    119          */
    120         @Override
    121         public View onCreateView(LayoutInflater inflater, ViewGroup container,
    122                 Bundle savedInstanceState) {
    123             View v = inflater.inflate(R.layout.hello_world, container, false);
    124             View tv = v.findViewById(R.id.text);
    125             ((TextView)tv).setText("Fragment #" + mNum);
    126             tv.setBackgroundDrawable(getResources().getDrawable(android.R.drawable.gallery_thumb));
    127             return v;
    128         }
    129     }
    130 //END_INCLUDE(fragment)
    131 }
    132