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>