我基本上创建了ToDo列表。我正在处理数据库部分，因此用户可以键入项目，并在单击添加按钮时填充列表。
遗憾的是，我完全迷失了如何让listview填充存储的项目。现在，当我输入内容并单击添加时，会弹出一个Toast消息，其中包含我刚刚添加的项目。现在我不得不让它出现。我已经创建了一个DataHelper.java类来处理sqlite的东西。
这是目前的样子 http://imgur.com/7ztCQSJ
这是我的FragmentTask.java文件
import android.content.Context;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.ListFragment;
import android.support.v4.content.Loader;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.Toast;
/**
* A simple {@link Fragment} subclass.
*
*/
public class FragmentTasks extends ListFragment implements OnClickListener{
public FragmentTasks() {
// Required empty public constructor
}
Button button;
EditText task;
DataHandler handler;
//ListView list;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
final View view = inflater.inflate(R.layout.fragment_tasks, container, false);
Button button = (Button)view.findViewById(R.id.button1);
button.setOnClickListener(this);
task = (EditText)view.findViewById(R.id.editText1);
button.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
String getTasks;
getTasks = "";
handler = new DataHandler(getActivity());
handler.open();
Cursor C = handler.returnData();
if(C.moveToFirst()){
do
{
getTasks = C.getString(0);
} while(C.moveToNext());
}
handler.close();
Toast.makeText(getActivity(), "Task :" +getTasks, Toast.LENGTH_LONG).show();
}
});
//return inflater.inflate(R.layout.fragment_tasks, container, false);
/* button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Activity activity = getActivity();
if (activity != null) {
Toast.makeText(activity, R.string.toast_you_just_clicked_a_fragment, Toast.LENGTH_LONG).show();
}
}
});
*/
return view;
}
/* @Override
public void onActivityCreated(Bundle savedInstanceState){
super.onActivityCreated(savedInstanceState);
//ArrayAdapter adapter=ArrayAdapter.
//createFromResource(getActivity(), R.array.tasks, android.R.layout.simple_list_item_1);
//setListAdapter(getTasks);
} */
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l){
Toast.makeText(getActivity(), "Item "+i,Toast.LENGTH_SHORT).show();
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String getTasks = task.getText().toString();
handler = new DataHandler(getActivity());
handler.open();
long id = handler.insertData(getTasks);
Toast.makeText(getActivity(), "Data inserted", Toast.LENGTH_LONG).show();
handler.close();
// ArrayAdapter<?> adapter=ArrayAdapter.createFromResource(getActivity(), R.array.tasks, android.R.layout.simple_list_item_1);
// setListAdapter(adapter);
/* button.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
String getTasks;
getTasks = "";
handler = new DataHandler(getActivity());
handler.open();
Cursor C = handler.returnData();
if(C.moveToFirst()){
do
{
getTasks = C.getString(0);
} while(C.moveToNext());
}
handler.close();
Toast.makeText(getActivity(), "Task :" +getTasks, Toast.LENGTH_LONG).show();
}
}); */
}}
这是我的DataHandler.java
package com.example.navbar;
import java.sql.SQLException;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DataHandler {
public static final String TASKS = "tasks";
public static final String TABLE_NAME = "mytable";
public static final String DATA_BASE_NAME = "mydatabase";
public static final int DATABASE_VERSION = 1;
public static final String TABLE_CREATE = "create table mytable(tasks text not null);";
DataBaseHelper dbhelper;
Context ctx;
SQLiteDatabase db;
public DataHandler(Context ctx){
this.ctx =ctx;
dbhelper = new DataBaseHelper(ctx);
}
private static class DataBaseHelper extends SQLiteOpenHelper{
public DataBaseHelper(Context ctx){
super(ctx,DATA_BASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db){
db.execSQL(TABLE_CREATE);
}
@Override
public void onUpgrade (SQLiteDatabase db, int oldversion, int newVersion){
db.execSQL("DROP TABLE IF EXISTS mytable");
onCreate(db);
}
}
public DataHandler open(){
db = dbhelper.getWritableDatabase();
return this;
}
public void close(){
dbhelper.close();
}
public long insertData(String tasks){
ContentValues content = new ContentValues();
content.put(TASKS, tasks);
return db.insertOrThrow(TABLE_NAME, null , content);
}
public Cursor returnData(){
return db.query(TABLE_NAME, new String[] {TASKS}, null, null, null, null, null);
}
}
fragment_task.xml
<?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:gravity="center"
android:orientation="vertical" >
<EditText
android:id="@+id/editText1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10" />
<Button
android:id="@+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add" />
<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="352dp"
android:divider="#0000CC"
android:dividerHeight="0.1dp" >
</ListView>
</LinearLayout>
我认为你们不需要看到这个，但以下是 MainActivity.java
package com.example.navbar;
import com.parse.Parse;
import com.parse.ParseAnalytics;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Activity;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
public class MainActivity extends FragmentActivity implements ActionBar.TabListener {
ViewPager viewPager;
ActionBar actionBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.pager);
viewPager.setAdapter(new MyAdapter(getSupportFragmentManager()));
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int arg0) {
// TODO Auto-generated method stub
actionBar.setSelectedNavigationItem(arg0);
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});
actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
ActionBar.Tab tab1 = actionBar.newTab();
tab1.setText("Tab1");
tab1.setTabListener(this);
ActionBar.Tab tab2 = actionBar.newTab();
tab2.setText("Tab2");
tab2.setTabListener(this);
ActionBar.Tab tab3 = actionBar.newTab();
tab3.setText("Tab3");
tab3.setTabListener(this);
actionBar.addTab(tab1);
actionBar.addTab(tab2);
actionBar.addTab(tab3);
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
class MyAdapter extends FragmentStatePagerAdapter{
public MyAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
}
@Override
public Fragment getItem(int i) {
// TODO Auto-generated method stub
Fragment fragment = null;
if (i == 0){
fragment=new FragmentToday();
}
if (i == 1){
fragment = new FragmentTasks();
}
if (i == 2){
fragment = new FragmentCalendar();
}
return fragment;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return 3;
}
}
}