1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:id="@+id/activity_main"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:orientation="horizontal"
 7     tools:context="com.example.lesson10_backtostack.MainActivity">
 8 
 9     <fragment
10         android:id="@+id/fragment2"
11         android:name="com.example.lesson10_backtostack.SingleFragment"
12         android:layout_weight="1"
13         android:layout_width="0dp"
14         android:layout_height="match_parent"/>
15 
16     <ListView
17         android:id="@+id/lv"
18         android:layout_width="0dp"
19         android:layout_weight="1"
20         android:layout_height="match_parent"/>
21 
22     <FrameLayout
23         android:id="@+id/fl_fragment"
24         android:layout_width="0dp"
25         android:layout_height="match_parent"
26         android:layout_weight="5" />
27 </LinearLayout>

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     android:layout_width="match_parent"
 3     android:layout_height="match_parent">
 4 
 5     <ImageView
 6         android:id="@+id/img"
 7         android:layout_width="match_parent"
 8         android:layout_height="match_parent"
 9         android:src="@mipmap/ic_launcher"/>
10 
11 </LinearLayout>

 1 public class SingleFragment extends Fragment {
 2     ImageView img;
 3 
 4     public static SingleFragment newInstance(int imgId){
 5         SingleFragment fragment = new SingleFragment();
 6         Bundle bundle = new Bundle();
 7         bundle.putInt("imgId",imgId);
 8         fragment.setArguments(bundle);
 9         return fragment;
10     }
11 
12     @Nullable
13     @Override
14     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
15         View layout = inflater.inflate(R.layout.frag_layout, null);
16         img = (ImageView) layout.findViewById(R.id.img);
17         return layout;
18     }
19 
20     @Override
21     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
22 
23         super.onViewCreated(view, savedInstanceState);
24         Bundle bundle = getArguments();
25         if (bundle == null) {
26             img.setImageResource(R.mipmap.ic_launcher);
27         } else {
28             int imgId = bundle.getInt("imgId");
29             img.setImageResource(imgId);
30         }
31         img.setScaleType(ImageView.ScaleType.FIT_XY);
32 
33         //Fragment条用Activity的方法
34         MainActivity activity = (MainActivity) getActivity();
35         activity.showToast("这是Fragment调用Activity的方法");
36     }
37 
38 
39     public void showToast(String msg) {
40         Log.e("TAG",msg);
41         Toast.makeText(getActivity(), msg, Toast.LENGTH_SHORT).show();
42     }
43 }

 1 public class MainActivity extends AppCompatActivity {
 2 
 3     int[] imgId = {R.mipmap.img01,R.mipmap.img02,R.mipmap.img03,R.mipmap.img04,R.mipmap.img05};
 4     String[] name = {"朴海镇","宋慧乔","宋仲基","全智贤","杨幂"};
 5 
 6     ListView lv;
 7     SingleFragment fragment;
 8     List<String> mList = new ArrayList<>();
 9 
10     @Override
11     protected void onCreate(Bundle savedInstanceState) {
12         super.onCreate(savedInstanceState);
13         setContentView(R.layout.activity_main);
14         //初始化数据
15         initData();
16         //初始化视图
17         initView();
18         initEvents();
19         SingleFragment fragment2 = (SingleFragment) getSupportFragmentManager().findFragmentById(R.id.fragment2);
20         fragment2.showToast("这是MainActivity调用Fragment的方法");
21 
22 
23 
24 
25     }
26 
27     private void initEvents() {
28         lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
29             @Override
30             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
31                 createFragment(position);
32 
33                 FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
34                 ft.replace(R.id.fl_fragment,fragment);
35                 ft.addToBackStack(null);
36                 ft.commit();
37             }
38         });
39     }
40 
41     private void createFragment(int position) {
42         fragment = SingleFragment.newInstance(imgId[position]);
43         /*Bundle bundle = new Bundle();
44         bundle.putInt("imgId",imgId[position]);
45         fragment.setArguments(bundle);*/
46 
47     }
48 
49     private void initView() {
50         lv = (ListView) findViewById(R.id.lv);
51         lv.setAdapter(new BaseAdapter() {
52             @Override
53             public int getCount() {
54                 return mList.size();
55             }
56 
57             @Override
58             public Object getItem(int position) {
59                 return mList.get(position);
60             }
61 
62             @Override
63             public long getItemId(int position) {
64                 return position;
65             }
66 
67             @Override
68             public View getView(int position, View convertView, ViewGroup parent) {
69                 if(convertView == null){
70                     convertView = new TextView(getBaseContext());
71                 }
72                 TextView tv = (TextView) convertView;
73                 tv.setPadding(20,20,20,20);
74                 tv.setText(mList.get(position));
75                 return tv;
76             }
77         });
78         createFragment(0);
79         FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
80         ft.add(R.id.fl_fragment,fragment);
81         ft.commit();
82 
83     }
84 
85 
86     private void initData() {
87         for(int i=0;i<name.length;i++){
88             mList.add(name[i]);
89         }
90     }
91 
92     public void showToast(String msg){
93         Toast.makeText(MainActivity.this,msg,Toast.LENGTH_SHORT).show();
94     }
95 
96 }