我正在创建一个测验应用程序，其中我在Arraylist中存储问题，但现在我必须使用片段显示它们但我无法弄清楚如何显示存储在下面片段中的arraylist中的问题是代码
这是数据库代码
package com.example.android.viewpager4;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import java.util.ArrayList;
import java.util.List;
public class DbHelper extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "triviaQuiz";
// tasks table name
private static final String TABLE_QUEST = "quest";
// tasks Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_QUES = "question";
private static final String KEY_ANSWER = "answer"; //correct option
private static final String KEY_OPTA= "opta"; //option a
private static final String KEY_OPTB= "optb"; //option b
private static final String KEY_OPTC= "optc"; //option c
private SQLiteDatabase dbase;
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
dbase=db;
String sql = "CREATE TABLE IF NOT EXISTS " + TABLE_QUEST + " ( "
+ KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_QUES
+ " TEXT, " + KEY_ANSWER+ " TEXT, "+KEY_OPTA +" TEXT, "
+KEY_OPTB +" TEXT, "+KEY_OPTC+" TEXT)";
db.execSQL(sql);
addQuestions();
//db.close();
}
private void addQuestions()
{
Question q1=new Question("What is JP?","Jalur Pesawat", "Jack sParrow", "Jasa Programmer", "Jasa Programmer");
this.addQuestion(q1);
Question q2=new Question("where the JP place?", "Monas, Jakarta", "Gelondong, Bangun Tapan, bantul", "Gelondong, Bangun Tapan, bandul", "Gelondong, Bangun Tapan, bantul");
this.addQuestion(q2);
Question q3=new Question("who is CEO of the JP?","Usman and Jack", "Jack and Rully","Rully and Usman", "Rully and Usman" );
this.addQuestion(q3);
Question q4=new Question("what do you know about JP?", "JP is programmer home", "JP also realigy home", "all answer is true","all answer is true");
this.addQuestion(q4);
Question q5=new Question("what do you learn in JP?","Realigy","Programming","all answer is true","all answer is true");
this.addQuestion(q5);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldV, int newV) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_QUEST);
// Create tables again
onCreate(db);
}
// Adding new question
public void addQuestion(Question quest) {
//SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_QUES, quest.getQUESTION());
values.put(KEY_ANSWER, quest.getANSWER());
values.put(KEY_OPTA, quest.getOPTA());
values.put(KEY_OPTB, quest.getOPTB());
values.put(KEY_OPTC, quest.getOPTC());
// Inserting Row
dbase.insert(TABLE_QUEST, null, values);
}
public List<Question> getAllQuestions() {
List<Question> quesList = new ArrayList<Question>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_QUEST;
dbase=this.getReadableDatabase();
Cursor cursor = dbase.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Question quest = new Question();
quest.setID(cursor.getInt(0));
quest.setQUESTION(cursor.getString(1));
quest.setANSWER(cursor.getString(2));
quest.setOPTA(cursor.getString(3));
quest.setOPTB(cursor.getString(4));
quest.setOPTC(cursor.getString(5));
quesList.add(quest);
} while (cursor.moveToNext());
}
// return quest list
return quesList;
}
public int rowcount()
{
int row=0;
String selectQuery = "SELECT * FROM " + TABLE_QUEST;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
row=cursor.getCount();
return row;
}
}
这是我应该进行更改的主要活动代码
package com.example.android.viewpager4;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import java.util.List;
import java.util.Vector;
public class MainActivity extends FragmentActivity
{
private PagerAdapter mPagerAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.viewpager_layout);
initialisePaging();
}
private void initialisePaging()
{
List<Fragment> fragments =new Vector<Fragment>();
mPagerAdapter= new com.example.android.viewpager4.PagerAdapter(this.getSupportFragmentManager(),fragments);
ViewPager pager =(ViewPager)findViewById(R.id.viewpager);
pager.setAdapter(mPagerAdapter);
}
}
这是xml布局，我必须用单选按钮作为选项显示问题
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".QuizActivity"
>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
<RadioGroup
android:id="@+id/radioGroup1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.04" >
<RadioButton
android:id="@+id/radio0"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:checked="true"
android:text="RadioButton" />
<RadioButton
android:id="@+id/radio1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="RadioButton" />
<RadioButton
android:id="@+id/radio2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="RadioButton" />
</RadioGroup>
</LinearLayout>
</RelativeLayout>
这是我的pageadapter代码
package com.example.android.viewpager4;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import java.util.List;
/**
* Created by Vikas on 4/27/2016.
*/
public class PagerAdapter extends FragmentPagerAdapter
{
private List<Fragment> fragments;
public PagerAdapter(FragmentManager fm, List<Fragment> fragments) {
super(fm);
this.fragments = fragments;
}
@Override
public Fragment getItem(int arg0)
{
return this.fragments.get(arg0);
}
@Override
public int getCount()
{
return this.fragments.size();
}
}
答案 0 :(得分：0)
I had to do pass an array to a fragment in my app Also. I used Gson to do it easily.
In your activity with the array list.
Gson gson = new Gson();
Type type = new TypeToken<List<YOUR_ARRAY_TYPE>>() {}.getType();
String json = gson.toJson(ARRAY_LIST,type);
args.putString("key",json);
NewFragment newFragment = new NewFragment();
newFragment.setArguments(args);
FragmentManager fragmentManager = ((FragmentActivity)context).getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_main,newFragment).addToBackStack(null).commit();
Now in your receiving fragment:
Bundle bundle = getArguments();
Type type = new TypeToken<List<YOUR_ARRAY_TYPE>>() {}.getType();
Gson gson = new Gson();
String json = bundle.getString("key");
List<YOUR_ARRAY_TYPE> linkers = gson.fromJson(json,type);