之前实现过Android开发之ContentProvider结合LoaderManager加载数据，现在来实现用ListFragment加载 先看main.xml
代码语言：javascript复制<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@ id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.listfragmentloadermanager.MainActivity" >
<LinearLayout
android:id="@ id/left"
android:layout_width="0sp"
android:layout_weight="1"
android:layout_height="match_parent"
android:orientation="vertical" >
<EditText
android:id="@ id/editText1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<requestFocus />
</EditText>
<Button
android:id="@ id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="添加姓名" />
</LinearLayout>
<LinearLayout
android:id="@ id/right"
android:layout_width="0sp"
android:layout_weight="2"
android:layout_height="match_parent"
android:orientation="vertical" >
</LinearLayout>
</LinearLayout>说明：右边的linearlayout是要加载listFragment的子类的，通过“添加”按钮实现 由于是listFragment的子类，所以还是需要布局文件的（就是listfragment的默认布局） list.xml
代码语言：javascript复制<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:id="@id/android:list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:drawSelectorOnTop="false" />
</LinearLayout>这里我们把listview每一项的item也自定义，就用最简单的textview item.xml
代码语言：javascript复制<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@ id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TextView" />
</LinearLayout>讲完了布局，我们来谈谈MainActivity.java和RightFragment.java MainActivity.java
代码语言：javascript复制package com.example.listfragmentloadermanager;
import android.app.Activity;
import android.app.FragmentTransaction;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
private Button button;
private EditText editText;
private FragmentTransaction transaction;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//加载listfragment
transaction = getFragmentManager().beginTransaction();
RightFragment rightFragment = new RightFragment();
transaction.replace(R.id.right, rightFragment);
transaction.commit();
editText = (EditText)findViewById(R.id.editText1);
button = (Button)findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
String name = editText.getText().toString();
ContentResolver resolver = getContentResolver();
Uri uri = Uri.parse("content://com.example.loadermanagertest2."
"PersonContentProvider/person");
ContentValues values = new ContentValues();
values.put("name", name);
resolver.insert(uri, values);
}
});
}
}为什么这里不需要初始化LoaderManager呢？因为LoaderManager监听的是listview和contentprovider的数据变化。而这个例子的listview在listfragment里面，所以要挪到listfragment里面初始化 RightFragment.java：
代码语言：javascript复制package com.example.listfragmentloadermanager;
import java.util.ArrayList;
import java.util.List;
import android.app.ListFragment;
import android.app.LoaderManager;
import android.app.LoaderManager.LoaderCallbacks;
import android.content.CursorLoader;
import android.content.Loader;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
public class RightFragment extends ListFragment implements LoaderCallbacks<Cursor>{
private LoaderManager loaderManager;
private MyAdapter adapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
loaderManager.initLoader(0, null, this);
View view = inflater.inflate(R.layout.list, null);
return view;
}
//onCreate里面初始化一些参数，而onCreateView里面创建布局
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
loaderManager = getLoaderManager();
}
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
Uri uri = Uri.parse("content://com.example.loadermanagertest2."
"PersonContentProvider/person");
CursorLoader loader = new CursorLoader(getActivity(), uri,
null, null, null, null);
return loader;
}
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
List<String> list = new ArrayList<String>();
while (data.moveToNext()) {
list.add(data.getString(data.getColumnIndex("name")));
}
adapter = new MyAdapter();
adapter.bindData(list);
setListAdapter(adapter);
adapter.notifyDataSetChanged();
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
}
//自定义adapter取数据
class MyAdapter extends BaseAdapter {
private List<String> list;
public void bindData(List<String> list) {
this.list = list;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = null;
if (convertView == null) {
view = LayoutInflater.from(getActivity()).inflate(
R.layout.item, null);
} else {
view = (View) convertView;
}
TextView textView = (TextView) view.findViewById(R.id.textView1);
textView.setText(list.get(position).toString());
return view;
}
}
}接下来就是实验结果
当然，com.example.loadermanagertest2.PersonContentProvider也就是上一篇这里写链接内容提到的manifest清单文件android:exported=”true”才行
