Fragment的两个子类ListFragment和DialogFragment的应用Demo

相比较之下Fragment比Activity更加轻量级，更节省资源，能够实现动态移除添加替换，方便灵活快捷

FragmentChildActivity的代码：

<span style="font-size:14px;">import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import com.xhsc.layout.relativelayout.R;

public class FragmentChildActivity extends Activity {

Button mDialogBtn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_activity__child_layout);
mDialogBtn = (Button) findViewById(R.id.dialog_fragment_btn);
getFragmentManager().beginTransaction().add(R.id.activity_fragment_child_framelayout,FragmentListChild.newInstance()).commit();

mDialogBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
getFragmentManager().beginTransaction().add(ChildDialogFragment.newInstance(),"dialog").commit();
}
});
}
}</span>

FragmentChildActivity的Xml布局代码：

<span style="font-family:SimSun;font-size:12px;"><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>

<Button
android:id="@+id/dialog_fragment_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="弹出对话框"/>
<FrameLayout
android:layout_below="@id/dialog_fragment_btn"
android:background="@android:color/holo_orange_light"
android:id="@+id/activity_fragment_child_framelayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">

</FrameLayout>
</RelativeLayout></span>

FragmentListChild的Java代码：

<span style="font-size:10px;">import android.app.ListFragment;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

/**
* A simple {@link Fragment} subclass.
*/
public class FragmentListChild extends ListFragment {

String[] arraylist={"俄指土总统参与IS石油交易","SUV被打成蜂窝 俄土黑海对峙","俄间谍被处决 官员醉酒骂人",
"男女诡异死亡 女挺大肚热舞","冰冰李晨当康熙最后一期嘉宾","习近平：支持金融机构扩大对南非融资规模"
,"习近平在津巴布韦野生动物基地给大象喂食","李克强部署金融改革 国务院通过计划生育法修正草案",
"户口办理拟向1300万黑户开放 多地超生落户脱钩计生","美国加州枪击案已致14死 确认系本土恐怖袭击 专题","普京让土耳其总统失眠 俄加紧在叙部署大批新武器"};
HeadlinesAdapter adapter;
public static FragmentListChild newInstance() {

Bundle args = new Bundle();

FragmentListChild fragment = new FragmentListChild();
fragment.setArguments(args);
return fragment;
}

@Override
public void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
String msg = (String) l.getAdapter().getItem(position);
Toast.makeText(getActivity(),msg,Toast.LENGTH_SHORT).show();
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
adapter = new HeadlinesAdapter(getActivity());
setListAdapter(adapter);
adapter.setArrayData(arraylist);

}

private class HeadlinesAdapter extends BaseAdapter {
String[] arrayData=new String[]{};
LayoutInflater layoutInflater;
public HeadlinesAdapter(Context context){
layoutInflater = LayoutInflater.from(context);
}

public void setArrayData(String[] arrayData) {
this.arrayData = arrayData;
notifyDataSetChanged();
}

@Override
public int getCount() {
return arrayData.length;
}

@Override
public Object getItem(int i) {
return arrayData[i];
}

@Override
public long getItemId(int i) {
return i;
}

@Override
public View getView(int i, View view, ViewGroup viewGroup) {

if(view==null){
view = layoutInflater.inflate(android.R.layout.simple_list_item_1,null);

}
TextView textView = (TextView) view;
textView.setText((String) getItem(i));
return view;
}
}
}</span>

ChildDialogFragment的Java代码：

<span style="font-size:12px;">import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.widget.Toast;

import com.xhsc.layout.relativelayout.R;

/**
* A simple {@link Fragment} subclass.
*/
public class ChildDialogFragment extends DialogFragment {

public static ChildDialogFragment newInstance() {

Bundle args = new Bundle();

ChildDialogFragment fragment = new ChildDialogFragment();
fragment.setArguments(args);
return fragment;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {

return new AlertDialog.Builder(getActivity()).setMessage("你好我是Fragment对话框").setIcon(R.drawable.dorsey).
setPositiveButton("确定",new DialogInterface.OnClickListener(){

@Override
public void onClick(DialogInterface dialogInterface, int i) {

Toast.makeText(getActivity(),"确定",Toast.LENGTH_SHORT).show();
}
}).create();
}

}</span>

也可以自定义布局Fragment对话，采用onCreateView()方法返回这个View即可