我正在开发一个带有外部数据库的字典。我可以用RecyclerView，Adapter和DBHelpr显示所有单词，但我的搜索和查询有问题。我不知道如何创建它的搜索。我想搜索2列。
MainActivity
public class MainActivity extends AppCompatActivity {
EditText Et;
SQLiteDatabase sqLiteDatabase;
private databse db;
Adapter mAdapter;
private List<Words> list = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar= (Toolbar)findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
db=new databse(this);
db.database();
db.open();
RecyclerView mRecyclerView = (RecyclerView) findViewById(R.id.listviews);
mAdapter = new Adapter(GetWords(),this,R.layout.itemsforeach);
mRecyclerView.setAdapter(mAdapter);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mRecyclerView.setHasFixedSize(true);
Et = (EditText)findViewById(R.id.Edidttext);
Et.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2)
{
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2)
{
}
@Override
public void afterTextChanged(Editable editable)
{
}
});
}
@Override
protected void onResume() {
super.onResume();
}
public List<Words> GetWords()
{
List<Words> list = new ArrayList<>();
databse databse = new databse(this);
sqLiteDatabase = databse.getWritableDatabase();
String query ="SELECT * FROM dictionary";
Cursor c = sqLiteDatabase.rawQuery(query,null);
if(c != null)
{
c.moveToFirst();
do {
//make a new object of Words's class
Words words = new Words();
words.setEwords(c.getString(c.getColumnIndex("src")));
words.setPwords(c.getString(c.getColumnIndex("dist")));
list.add(words);
}while (c.moveToNext());
return list;
}
else
{
return null;
}
}
}
数据库
public class databse extends SQLiteOpenHelper {
public static final String path="data/data/com.dic.hossein.mydictionary/databases/";
public static final String Name="mydice.db3";
public SQLiteDatabase mydb;
private final Context mycontext;
public databse(Context context) {
super(context, "mydice.db3", null, 1);
mycontext=context;
}
@Override
public void onCreate(SQLiteDatabase arg0) {
// TODO Auto-generated method stub
}
@Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
// TODO Auto-generated method stub
}
public void database(){
boolean checkdb=checkdb();
if(checkdb){
}else{
this.getReadableDatabase();
try{
copydatabase();
}catch(IOException e){
}
}
}
public void open(){
mydb=SQLiteDatabase.openDatabase(path+Name, null, SQLiteDatabase.OPEN_READWRITE);
}
public void close(){
mydb.close();
}
public boolean checkdb(){
SQLiteDatabase db=null;
try{
db=SQLiteDatabase.openDatabase(path+Name, null, SQLiteDatabase.OPEN_READONLY);
}
catch(SQLException e)
{
}
return db !=null ? true:false ;
}
public void copydatabase() throws IOException{
OutputStream myOutput = new FileOutputStream(path+Name);
byte[] buffer = new byte[1024];
int length;
InputStream myInput = mycontext.getAssets().open("mydice.db3");
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
myInput.close();
myOutput.flush();
myOutput.close();
}
public String Display(int row,int fild){
Cursor cu= mydb.query("dictionary", null, null, null, null, null, null);
cu.moveToPosition(row);
String name=cu.getString(fild);
return name;
}
}
适配器
public class Adapter extends RecyclerView.Adapter<ItemsViewHolder> {
Context context;
List<Words> wordses;
int UI;
public Adapter(List<Words> wordses, Context context, int UI) {
this.wordses = wordses;
this.context = context;
this.UI = UI;
}
@Override
public ItemsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
ItemsViewHolder itemsViewHolder = new ItemsViewHolder(LayoutInflater.from(context).inflate(UI,null));
return itemsViewHolder;
}
@Override
public void onBindViewHolder(ItemsViewHolder holder, int position) {
final Words words = wordses.get(position);
holder.pWords.setText(words.getPwords());
holder.eWords.setText(words.getEwords());
}
@Override
public int getItemCount() {
return wordses.size();
}
}