5. Fragment详解

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2024-07-14 07:48:28 221人阅读

onCreateView是Fragment生命周期方法中最重要的一个。因为在该方法中会创建在Fragment中显示的View。

public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState){

// 装载布局文件

View view = inflater.inflate(R.layout.my_fragment, null); TextView textview =

(TextView)view.findViewById(R.id.textview);

testview.setText("Fragment Test");

return view;

}

Fragment与Activity之间可以通过Fragment.setArguments方法向 Fragment传递参数值,并且可以通过Fragment.getArguments方法获取这些传递的参数值。

范例1：第一个Fragment程序。

 1 import android.app.Activity; 2 import android.os.Bundle; 3  4 public class FirstFragmentActivity extends Activity { 5     @Override 6     public void onCreate(Bundle savedInstanceState) { 7         super.onCreate(savedInstanceState); 8         setContentView(R.layout.activity_first_fragment); 9     }10 }

 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     <fragment 6         android:id="@+id/titles" 7         android:layout_width="match_parent" 8         android:layout_height="match_parent" 9 10        class="cn.eoe.first.fragment.LeftFragment" />11 </LinearLayout>

 1 package cn.eoe.first.fragment; 2  3 import java.io.InputStream; 4  5 import android.app.Fragment; 6 import android.content.Intent; 7 import android.os.Bundle; 8 import android.view.LayoutInflater; 9 import android.view.View;10 import android.view.ViewGroup;11 import android.widget.AdapterView;12 import android.widget.AdapterView.OnItemClickListener;13 import android.widget.ArrayAdapter;14 import android.widget.ListView;15 import android.widget.TextView;16 17 public class LeftFragment extends Fragment implements OnItemClickListener {18 19     private String[] data = http://www.mamicode.com/new String[] { "灵魂战车2", "变形金刚3:月黑之时", "敢死队2" };20     private ListView listView;21 22     @Override23     public View onCreateView(LayoutInflater inflater, ViewGroup container,24             Bundle savedInstanceState) {25         View view = inflater.inflate(R.layout.left_fragment, null);26         listView = (ListView) view.findViewById(R.id.listview_movie_list);27         listView.setOnItemClickListener(this);28         ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(29                 getActivity(), android.R.layout.simple_list_item_activated_1,30                 data);31         listView.setAdapter(arrayAdapter);32         listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);33 34         return view;35     }36 37     @Override38     public void onItemClick(AdapterView<?> parent, View view, int position,39             long id) {40         try {41 42             TextView textView = (TextView) getActivity().findViewById(43                     R.id.textview_detail);44             InputStream is = getActivity().getResources().getAssets()45                     .open("m" + position);46             byte[] buffer = new byte[1024];47             int count = is.read(buffer);48             String detail = new String(buffer, 0, count, "utf-8");49             if (textView == null) {50                 Intent intent = new Intent(getActivity(), DetailActivity.class);51                 intent.putExtra("detail", detail);52                 startActivity(intent);53             } else {54                 textView.setText(detail);55             }56             is.close();57         } catch (Exception e) {58             // TODO: handle exception59         }60 61     }62 63 }

 1 public class DetailActivity extends Activity { 2     @Override 3     public void onCreate(Bundle savedInstanceState) { 4         super.onCreate(savedInstanceState); 5         setContentView(R.layout.activity_detail); 6         TextView detail = (TextView) findViewById(R.id.textview_detail); 7         detail.setText(getIntent().getExtras().getString("detail")); 8  9     }10 }

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 2     android:layout_width="match_parent" 3     android:layout_height="match_parent" > 4  5     <fragment 6         android:id="@+id/details" 7         android:layout_width="match_parent" 8         android:layout_height="match_parent" 9         class="cn.eoe.first.fragment.RightFragment" />10 11 </RelativeLayout>

1 public class RightFragment extends Fragment {2     @Override3     public View onCreateView(LayoutInflater inflater, ViewGroup container,4             Bundle savedInstanceState) {5         View view = inflater.inflate(R.layout.right_fragment, null);6         return view;7     }8 }

范例2：向Fragment传递数据，并获取传递数据的值

activity_fragment_argument.xml

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 2     android:layout_width="match_parent" 3     android:layout_height="match_parent" 4     android:orientation="vertical" > 5  6     <Button 7         android:layout_width="match_parent" 8         android:layout_height="wrap_content" 9         android:layout_marginBottom="10dp"10         android:onClick="onClick_SendData"11         android:text="向Fragment传递数据" />12 13     <FrameLayout14         android:id="@+id/fragment_container1"15         android:layout_width="match_parent"16         android:layout_height="wrap_content" />17 18 </LinearLayout>

 1 import android.app.Activity; 2 import android.app.FragmentManager; 3 import android.app.FragmentTransaction; 4 import android.os.Bundle; 5 import android.view.View; 6 import android.widget.EditText; 7 import android.widget.Toast; 8  9 public class FragmentArgumentActivity extends Activity {10 11     @Override12     protected void onCreate(Bundle savedInstanceState) {13         super.onCreate(savedInstanceState);14         setContentView(R.layout.activity_fragment_argument);15     }16 17     // 向Fragment传递数据18     public void onClick_SendData(View view) {19         // 获取传递的数据（页面）20         MyFragment fragment = new MyFragment();21 22         Bundle bundle = new Bundle();23 24         bundle.putString("name", "Hello Fragment1");25         fragment.setArguments(bundle);26         FragmentManager fragmentManager = getFragmentManager();27         FragmentTransaction fragmentTransaction = fragmentManager28                 .beginTransaction();29         fragmentTransaction.add(R.id.fragment_container1, fragment, "fragment");30 31         fragmentTransaction.commit();32 33         Toast.makeText(this, "数据已成功传递.", Toast.LENGTH_LONG).show();34 35     }36 37     // 获取传递的数据38     public void onClick_ShowArgument(View view) {39         EditText editText = (EditText) findViewById(R.id.edittext);40 41         String name = getFragmentManager().findFragmentByTag("fragment")42                 .getArguments().getString("name");43         editText.setText(name);44     }45 }

 1 import android.app.Fragment; 2 import android.os.Bundle; 3 import android.util.Log; 4 import android.view.LayoutInflater; 5 import android.view.View; 6 import android.view.ViewGroup; 7  8 public class MyFragment extends Fragment { 9     @Override10     public View onCreateView(LayoutInflater inflater, ViewGroup container,11             Bundle savedInstanceState) {12         View view = inflater.inflate(R.layout.my_fragment, container, false);13         return view;14     }15 16     @Override17     public void onDestroyView() {18         Log.d("name", getArguments().getString("name"));19         super.onDestroyView();20     }21 22 }

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 2     android:layout_width="match_parent" 3     android:layout_height="match_parent" 4     android:orientation="vertical" > 5  6     <EditText 7         android:id="@+id/edittext" 8         android:layout_width="match_parent" 9         android:layout_height="wrap_content" />10 11     <Button12         android:layout_width="match_parent"13         android:layout_height="wrap_content"14         android:onClick="onClick_ShowArgument"15         android:text="获取传递的数据" />16 17 </LinearLayout>

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5. Fragment详解

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