[英]How do I add images in my questions database in Android Studio?
我正在Android Studio中为Android构建测验应用程序。 我已经准备好问题，但是现在我需要在数据库的相关问题中添加某些图像。 例如，一张图像仅用于问题1，另一幅图像用于问题2，依此类推。
这是FlagDatabase.java代码：
package com.example.darel.geogame;
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 FlagDatabase extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "geo_flag";
// tasks table name
private static final String TABLE_QUEST = "quest";
// tasks Table Columns names
private static final String KEY_ID = "qid";
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 static final String KEY_OPTD = "optd"; // option D
private int currImage = 0;
private SQLiteDatabase dbase;
public FlagDatabase(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, " + KEY_OPTD + " TEXT)";
db.execSQL(sql);
addQuestion();
// db.close();
}
private void addQuestion() {
Question q1 = new Question("How many colours are there on the flag of Pahang?", "3", "2", "4", "1", "2");
this.addQuestion(q1);
Question q2 = new Question("The previous flag of Sarawak looked remarkably similar and inverted to the current flag of which European country?", "Czech Republic", "Austria", "Hungary", "Slovenia", "Czech Republic");
this.addQuestion(q2);
Question q3 = new Question("Which of the following state flags does NOT have the colour white?", "Selangor", "Perlis", "Johor", "Melaka", "Perlis");
this.addQuestion(q3);
Question q4 = new Question("What feature makes the flag of Sabah unique from the other states' flags?", "14-pointed star", "A sun with 9 rays", "The word SABAH", "Mountain", "Mountain");
this.addQuestion(q4);
Question q5 = new Question("Which of the following state flags has the colour blue?", "Penang", "Perak", "Kedah", "Sarawak", "Penang");
this.addQuestion(q5);
Question q6 = new Question("The new flag of the Federal Territories of Malaysia was adopted in which year?", "1999", "2003", "2006", "2007", "2006");
this.addQuestion(q6);
Question q7 = new Question("The flag of Negeri Sembilan has three colours. Which of the following colours is NOT included?", "Red", "Yellow", "White", "Black", "White");
this.addQuestion(q7);
Question q8 = new Question("The flag of Penang was adopted in which year?", "1936", "1957", "1943", "1949", "1949");
this.addQuestion(q8);
Question q9 = new Question("Kelantan has one of the most unique flags in Malaysia. What object is NOT featured in the flag?", "Keris", "Spears", "Star", "Shield", "Shield");
this.addQuestion(q9);
Question q10 = new Question("What does the yellow colour symbolize in the flag of Sarawak?", "Harmony", "Southeast Asian royalty", "Eastern culture", "The Sun's rays", "Southeast Asian royalty");
this.addQuestion(q10);
Question q11 = new Question("Arrange the colours seen on the flag of Perak from top to bottom.", "White, Black, Yellow", "Yellow, White, Black", "Black, Yellow, White", "White, Yellow, Black", "White, Yellow, Black");
this.addQuestion(q11);
Question q12 = new Question("Which of the following state flags does NOT have the crescent and star?", "Terengganu", "Melaka", "Negeri Sembilan", "Johor", "Negeri Sembilan");
this.addQuestion(q12);
Question q13 = new Question("Which state's flag was claimed to be too simple and dull in 2006?", "Terengganu", "Pahang", "Perlis", "Kedah", "Terengganu");
this.addQuestion(q13);
Question q14 = new Question("How many shades of blue are seen on the flag of Sabah?", "3", "4", "1", "2", "3");
this.addQuestion(q14);
Question q15 = new Question("What year was the current flag of Sabah adopted?", "1981", "1983", "1986", "1988", "1988");
this.addQuestion(q15);
Question q16 = new Question("How many colours are featured on the flag of Malacca?", "2", "4", "3", "5", "4");
this.addQuestion(q16);
Question q17 = new Question("Selangor's first flag in the 1780s looked remarkably similar to the flag of which European country?", "Spain", "Germany", "Netherlands", "Ukraine", "Spain");
this.addQuestion(q17);
Question q18 = new Question("If you invert the flag of Ukraine, which state would resemble that flag?", "Perak", "Perlis", "Pahang", "Federal Territory", "Perlis");
this.addQuestion(q18);
Question q19 = new Question("The dominant colour of Kedah is red. What does the red symbolize?", "Wealth", "Blood shed", "Prosperity", "Agility", "Prosperity");
this.addQuestion(q19);
Question q20 = new Question("Which of the following state flags is considered tri-coloured?", "Perlis", "Perak", "Pahang", "Terengganu", "Perak");
this.addQuestion(q20);
Question q21 = new Question("What type of blue is used for the Mount Kinabalu silhouette in the flag of Sabah?", "Royal", "Navy", "Zircon", "Icicle", "Royal");
this.addQuestion(q21);
// END
}
@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());
values.put(KEY_OPTD, quest.getOPTD());
// 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 + " ORDER BY RANDOM()";
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));
quest.setOPTD(cursor.getString(6));
quesList.add(quest);
} while (cursor.moveToNext());
}
// return quest list
return quesList;
}
}
这是Question.java文件：
package com.example.darel.geogame;
import android.app.Activity;
public class Question extends Activity {
private int ID;
private String QUESTION;
private String OPTA;
private String OPTB;
private String OPTC;
private String OPTD;
private String ANSWER;
public Question() {
ID = 0;
QUESTION = "";
OPTA = "";
OPTB = "";
OPTC = "";
OPTD = "";
ANSWER = "";
}
public Question(String qUESTION, String oPTA, String oPTB, String oPTC, String oPTD,
String aNSWER) {
QUESTION = qUESTION;
OPTA = oPTA;
OPTB = oPTB;
OPTC = oPTC;
OPTD = oPTD;
ANSWER = aNSWER;
}
public int getID() {
return ID;
}
public String getQUESTION() {
return QUESTION;
}
public String getOPTA() {
return OPTA;
}
public String getOPTB() {
return OPTB;
}
public String getOPTC() {
return OPTC;
}
public String getOPTD() {
return OPTD;
}
public String getANSWER() {
return ANSWER;
}
public void setID(int id) {
ID = id;
}
public void setQUESTION(String qUESTION) {
QUESTION = qUESTION;
}
public void setOPTA(String oPTA) {
OPTA = oPTA;
}
public void setOPTB(String oPTB) {
OPTB = oPTB;
}
public void setOPTC(String oPTC) {
OPTC = oPTC;
}
public void setOPTD(String oPTD) {
OPTD = oPTD;
}
public void setANSWER(String aNSWER) {
ANSWER = aNSWER;
}
}
QuestionActivity.java
package com.example.darel.geogame;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.util.List;
public class QuestionActivity extends Activity {
List<Question> quesList;
int score = 0;
int qid = 0;
Question currentQ;
TextView txtQuestion, times, scored;
Button button1, button2, button3, button4;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FlagDatabase db = new FlagDatabase(this); // my question bank class
quesList = db.getAllQuestions(); // this will fetch all quetonall questions
currentQ = quesList.get(qid); // the current question
txtQuestion = (TextView) findViewById(R.id.txtQuestion);
times = (TextView) findViewById(R.id.timers);
times.setText("");
// the textview in which the question will be displayed
// the three buttons,
// the idea is to set the text of three buttons with the options from question bank
button1 = (Button) findViewById(R.id.button1);
button2 = (Button) findViewById(R.id.button2);
button3 = (Button) findViewById(R.id.button3);
button4 = (Button) findViewById(R.id.button4);
// the textview in which score will be displayed
scored = (TextView) findViewById(R.id.score);
// method which will set the things up for our game
setQuestionView();
// button click listeners
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// passing the button text to other method
// to check whether the anser is correct or not
// same for all three buttons
getAnswer(button1.getText().toString());
}
});
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getAnswer(button2.getText().toString());
}
});
button3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getAnswer(button3.getText().toString());
}
});
button4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getAnswer(button4.getText().toString());
}
});
}
public void getAnswer(String AnswerString) {
if (currentQ.getANSWER().equals(AnswerString)) {
// if conditions matches increase the int (score) by 1
// and set the text of the score view
score++;
scored.setText("Score : " + score);
}
if (qid < 10) {
// if questions are not over then do this
currentQ = quesList.get(qid);
setQuestionView();
}
else {
// if over do this
Intent intent = new Intent(QuestionActivity.this,
ResultActivity.class);
Bundle b = new Bundle();
b.putInt("score", score); // Your score
intent.putExtras(b); // Put your score to your next
startActivity(intent);
finish();
}
}
private void setQuestionView() {
// the method which will put all things together
txtQuestion.setText(currentQ.getQUESTION());
button1.setText(currentQ.getOPTA());
button2.setText(currentQ.getOPTB());
button3.setText(currentQ.getOPTC());
button4.setText(currentQ.getOPTD());
qid++;
}
}
这是设计界面的xml文件：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:id="@+id/relatively"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#d15400"
android:orientation="vertical"
android:weightSum="1" >
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.90"
android:orientation="vertical"
android:weightSum="1"
android:background="@drawable/interface12">
<LinearLayout
android:id="@+id/linearLayout11"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.20"
android:orientation="vertical"
android:weightSum="1" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="horizontal" >
<TextView
android:id="@+id/score"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginRight="10dp"
android:layout_weight="1"
android:gravity="center"
android:text="Score : 0"
android:textColor="#000000"
android:textSize="25.0sp"
android:textStyle="bold" />
<TextView
android:id="@+id/timers"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_gravity="center"
android:layout_marginRight="10dp"
android:layout_weight="1"
android:gravity="center"
android:text="00:00:49"
android:textColor="#000000"
android:textSize="25.0sp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="@+id/linearLayout12"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.60"
android:orientation="vertical"
android:weightSum="1" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.40" >
<TextView
android:id="@+id/txtQuestion"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_gravity="center"
android:layout_marginTop="5dp"
android:gravity="center"
android:text="15*2*1-1"
android:textColor="#000000"
android:textSize="20.0sp"
android:textStyle="bold" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.20"
android:orientation="vertical"
android:weightSum="1" >
<Button
android:id="@+id/button1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="80dp"
android:layout_marginRight="80dp"
android:layout_marginTop="5dp"
android:background="#fff821"
android:gravity="center"
android:text="30"
android:textColor="#000000"
android:textSize="20.0sp" />
<Button
android:id="@+id/button2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="80dp"
android:layout_marginRight="80dp"
android:layout_marginTop="5dp"
android:background="#fff821"
android:gravity="center"
android:text="29"
android:textColor="#000000"
android:textSize="20.0sp" />
<Button
android:id="@+id/button3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="80dp"
android:layout_marginRight="80dp"
android:layout_marginTop="5dp"
android:background="#fff821"
android:gravity="center"
android:text="32"
android:textColor="#000000"
android:textSize="20.0sp" />
<Button
android:id="@+id/button4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="80dp"
android:layout_marginRight="80dp"
android:layout_marginTop="5dp"
android:background="#fff821"
android:gravity="center"
android:text="32"
android:textColor="#000000"
android:textSize="20.0sp" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</LinearLayout>
</LinearLayout>
您必须使用“斑点”来存储图像。
byte[] data = getBitmapAsByteArray(img);
例如，您可以在数据库中添加一个名为“ img_link”的列。 此列将包含图像的URL（如果是在线图像）或可绘制的文件名（如果图像包含在您的Android应用程序中），则您可以简单地加载图像的内容（使用该图像的值列）中与每个测验问题相关的ImageView中。
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