我目前正在开发一个应用程序。它的作用是，用户会输入一些句子，然后应用程序会得到模棱两可的词，然后显示它的含义。在我的表中，我有 _id、word、meaning、definition_number 等字段。
样本数据：
_id 词义定义_编号
1 中断从某事暂停 1
2 中断切割成碎片 2
如果用户输入：我的休息时间非常快。预期的输出将是：
模棱两可的词：中断
含义：暂停某事
我想随机显示它。这是我的DBHelper.class中的一段代码：
public Cursor getAllWords()
{
Cursor localCursor =
//this.myDataBase.query(DB_TABLE, new String[] {
// KEY_ID, KEY_WORD, KEY_MEANING }, null, null, null, null, null);//"RANDOM()");
//this.myDataBase.query(DB_TABLE, new String[] {
// KEY_ID, KEY_WORD, KEY_MEANING }, null, null, null, null, "RANDOM()", " 1");
this.myDataBase.query(DB_TABLE, new String[] {
KEY_ID, KEY_WORD, KEY_MEANING },
null, null, null, null, "RANDOM()");
if (localCursor != null){
localCursor.moveToFirst();
}
return localCursor;
}
MainActivity.class：
ArrayList<String> colWords = new ArrayList<String>();
ArrayList<String> colMeanings = new ArrayList<String>();
String[] words;
String[] meanings;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initControls();
}
private void initControls() {
// TODO Auto-generated method stub
text = (EditText) findViewById (R.id.editText1);
view = (TextView) findViewById (R.id.textView1);
clear = (Button) findViewById (R.id.button2);
clear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
text.setText("");
view.setText("");
}
});
connectDB();
ok = (Button) findViewById (R.id.button1);
ok.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//Log.d(strWord, strWord);
strWord = text.getText().toString();
if(strWord.isEmpty()){
Toast.makeText(MainActivity.this, "Please input some data", Toast.LENGTH_SHORT).show();
} else {
checkAmbiguousWord();
}
}
});
}
private void connectDB(){
dbHelper = new DBHelper(MainActivity.this);
try {
dbHelper.createDataBase();
} catch (IOException ioe) {
throw new Error("Unable to create database");
}
try {
dbHelper.openDataBase();
} catch (SQLException sqle) {
throw sqle;
}
cursor = dbHelper.getAllWords();
/*strWord = cursor.getString(cursor.getColumnIndex(DBHelper.KEY_WORD))
+ cursor.getString(cursor.getColumnIndex(DBHelper.KEY_MEANING)); */
colWords.clear();///added code
colMeanings.clear();///added code
/*
for(cursor.moveToFirst(); cursor.moveToNext(); cursor.isAfterLast()) {
colWords.add(cursor.getString(1));
colMeanings.add(cursor.getString(2));
String records = cursor.getString(0);
Log.d("Records", records);
} */
if (cursor != null) {
if (cursor.moveToFirst()) {
do {
colWords.add(cursor.getString(1));
colMeanings.add(cursor.getString(2));
String records = cursor.getString(0);
Log.d("Records", records);
} while (cursor.moveToNext());
}
}
}
private void checkAmbiguousWord(){
final String textToCheck = text.getText().toString();
List<Integer> ambiguousIndexes = findAmbiguousWordIndexes(textToCheck);
view.setText(!ambiguousIndexes.isEmpty() ?
ambigousIndexesToMessage(ambiguousIndexes) : "No ambiguous word/s found.");
}
/**
* @param text checked for ambiguous words
* @return the list of indexes of the ambiguous words in the {@code words} array
*/
private List<Integer> findAmbiguousWordIndexes(String text) {
final String lowerCasedText = text.toLowerCase();
final List<Integer> ambiguousWordIndexList = new ArrayList<Integer>();
words = (String[]) colWords.toArray(new String[colWords.size()]);
meanings = (String[]) colMeanings.toArray(new String[colMeanings.size()]);
for (int i = 0; i < words.length; i++) {
if (lowerCasedText.contains(words[i].toLowerCase())) {
ambiguousWordIndexList.add(i);
}
}
return ambiguousWordIndexList;
}
public String ambigousIndexesToMessage(List<Integer> ambiguousIndexes) {
// create the text using the indexes
// this is an example implementation
StringBuilder sb = new StringBuilder();
for (Integer index : ambiguousIndexes) {
sb.append("Ambiguous words: ");
sb.append(words[index] + "\nMeaning: " + meanings[index] + "\n");
sb.append("");
}
return sb.toString();
}
但它所做的只是显示两条记录。id 1 和 id 2。我只想随机显示一条记录。我真的需要这方面的帮助。有任何想法吗？我很乐意欣赏它。