5. Fragment详解

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。

 import android.app.Activity;
 import android.os.Bundle;

 public class FirstFragmentActivity extends Activity {
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_first_fragment);
     }
 }

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent" >

     <fragment
         android:id="@+id/titles"
         android:layout_width="match_parent"
         android:layout_height="match_parent"

        class="cn.eoe.first.fragment.LeftFragment" />
 </LinearLayout> 

 package cn.eoe.first.fragment;

 import java.io.InputStream;

 import android.app.Fragment;
 import android.content.Intent;
 import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemClickListener;
 import android.widget.ArrayAdapter;
 import android.widget.ListView;
 import android.widget.TextView;

 public class LeftFragment extends Fragment implements OnItemClickListener {

     private String[] data = new String[] { "灵魂战车2", "变形金刚3:月黑之时", "敢死队2" };
     private ListView listView;

     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
             Bundle savedInstanceState) {
         View view = inflater.inflate(R.layout.left_fragment, null);
         listView = (ListView) view.findViewById(R.id.listview_movie_list);
         listView.setOnItemClickListener(this);
         ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(
                 getActivity(), android.R.layout.simple_list_item_activated_1,
                 data);
         listView.setAdapter(arrayAdapter);
         listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);

         return view;
     }

     @Override
     public void onItemClick(AdapterView<?> parent, View view, int position,
             long id) {
         try {

             TextView textView = (TextView) getActivity().findViewById(
                     R.id.textview_detail);
             InputStream is = getActivity().getResources().getAssets()
                     .open("m" + position);
             byte[] buffer = new byte[1024];
             int count = is.read(buffer);
             String detail = new String(buffer, 0, count, "utf-8");
             if (textView == null) {
                 Intent intent = new Intent(getActivity(), DetailActivity.class);
                 intent.putExtra("detail", detail);
                 startActivity(intent);
             } else {
                 textView.setText(detail);
             }
             is.close();
         } catch (Exception e) {
             // TODO: handle exception
         }

     }

 }

 public class DetailActivity extends Activity {
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_detail);
         TextView detail = (TextView) findViewById(R.id.textview_detail);
         detail.setText(getIntent().getExtras().getString("detail"));

     }
 }

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent" >

     <fragment
         android:id="@+id/details"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         class="cn.eoe.first.fragment.RightFragment" />

 </RelativeLayout>

 public class RightFragment extends Fragment {
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
             Bundle savedInstanceState) {
         View view = inflater.inflate(R.layout.right_fragment, null);
         return view;
     }
 }

范例2：向Fragment传递数据，并获取传递数据的值

activity_fragment_argument.xml

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical" >

     <Button
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_marginBottom="10dp"
         android:onClick="onClick_SendData"
         android:text="向Fragment传递数据" />

     <FrameLayout
         android:id="@+id/fragment_container1"
         android:layout_width="match_parent"
         android:layout_height="wrap_content" />

 </LinearLayout>

 import android.app.Activity;
 import android.app.FragmentManager;
 import android.app.FragmentTransaction;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.EditText;
 import android.widget.Toast;

 public class FragmentArgumentActivity extends Activity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_fragment_argument);
     }

     // 向Fragment传递数据
     public void onClick_SendData(View view) {
         // 获取传递的数据（页面）
         MyFragment fragment = new MyFragment();

         Bundle bundle = new Bundle();

         bundle.putString("name", "Hello Fragment1");
         fragment.setArguments(bundle);
         FragmentManager fragmentManager = getFragmentManager();
         FragmentTransaction fragmentTransaction = fragmentManager
                 .beginTransaction();
         fragmentTransaction.add(R.id.fragment_container1, fragment, "fragment");

         fragmentTransaction.commit();

         Toast.makeText(this, "数据已成功传递.", Toast.LENGTH_LONG).show();

     }

     // 获取传递的数据
     public void onClick_ShowArgument(View view) {
         EditText editText = (EditText) findViewById(R.id.edittext);

         String name = getFragmentManager().findFragmentByTag("fragment")
                 .getArguments().getString("name");
         editText.setText(name);
     }
 }

 import android.app.Fragment;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;

 public class MyFragment extends Fragment {
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
             Bundle savedInstanceState) {
         View view = inflater.inflate(R.layout.my_fragment, container, false);
         return view;
     }

     @Override
     public void onDestroyView() {
         Log.d("name", getArguments().getString("name"));
         super.onDestroyView();
     }

 }

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical" >

     <EditText
         android:id="@+id/edittext"
         android:layout_width="match_parent"
         android:layout_height="wrap_content" />

     <Button
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:onClick="onClick_ShowArgument"
         android:text="获取传递的数据" />

 </LinearLayout>