在Android中使用數據庫實現搜索搜索

我已經使用數據庫創建了一個簡單的列表應用程序。我想在此添加搜索功能。我能夠執行搜索，但是當我單擊搜索列表中的項目時，它總是打開列表中第一項的屏幕。我希望能夠點擊並查看搜索列表中任何人的詳細信息。請幫助...在Android中使用數據庫實現搜索搜索

主要活動

import android.content.Intent; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.support.v7.widget.Toolbar; 
import android.text.Editable; 
import android.text.TextWatcher; 
import android.view.*; 
import android.widget.*; 
import java.util.ArrayList; 


public class MainActivity extends AppCompatActivity { 

public static ArrayList<String> Array_Names= new ArrayList<String>(); 

MyDBHandler dbHandler; 
MyDBHandler d1; 
EditText searchtext; 
ListView mylist; 
ArrayAdapter<String> myAdapter; 


private android.support.v7.widget.Toolbar toolbar; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    dbHandler = new MyDBHandler(this, null, null, 1); 
    d1= new MyDBHandler(this,null,null,1); 
    searchtext=(EditText)findViewById(R.id.searchtext); 
    /*dbHandler.addProduct(new Product("Mike", "222222222")); 
    dbHandler.addProduct(new Product("Ashley", "333333333")); 
    dbHandler.addProduct(new Product("Kevin", "444444444")); 
    dbHandler.addProduct(new Product("Nathan", "555555555"));*/ 
    /*toolbar=(Toolbar)findViewById(R.id.tool_bar); 
    setSupportActionBar(toolbar);*/ 
    ScreenDetails(); 



} 

public void ScreenDetails(){ 
    dbHandler.getAllContacts(); 

    mylist= (ListView)findViewById(R.id.mylist); 
    myAdapter= new CustomAdapter(this,Array_Names); 
    mylist.setAdapter(myAdapter); 
    searchtext.addTextChangedListener(new TextWatcher() { 

     @Override 
     public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) { 
      // When user changed the Text 
      myAdapter.getFilter().filter(cs); 

     } 

     @Override 
     public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, 
             int arg3) { 
      // TODO Auto-generated method stub 

     } 

     @Override 
     public void afterTextChanged(Editable arg0) { 
      // TODO Auto-generated method stub 
     } 
    }); 

    final Intent intent=new Intent(this,Display.class); 
    mylist.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
      d1.addSortedProduct(); 
      int pass_id=position+1; 
      Bundle data_bundle= new Bundle(); 
      data_bundle.putInt("id",pass_id); 
      intent.putExtras(data_bundle); 
      startActivity(intent); 

     } 
    }); 
} 
public boolean onCreateOptionsMenu(Menu menu) { 

    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.menu_main, menu); 

    return super.onCreateOptionsMenu(menu); 

} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    switch (item.getItemId()) { 


     default: 
      return super.onOptionsItemSelected(item); 
    } 
}

產品類別

public class Product { 

private int _id; 
private String _CName; 
private String _phno; 

public Product(){ 

} 
public Product(String _CName, int _id, String _phno) { 
this._CName = _CName; 
this._id = _id; 
this._phno = _phno; 
} 

public Product(String _CName, String _phno) { 
this._CName = _CName; 
this._phno = _phno; 
} 

public String get_CName() { 
return _CName; 
} 

public void set_CName(String _CName) { 
this._CName = _CName; 
} 

public int get_id() { 
return _id; 
} 

public void set_id(int _id) { 
this._id = _id; 
} 

public String get_phno() { 
return _phno; 
} 

public void set_phno(String _phno) { 
this._phno = _phno; 
} 
}

數據庫處理器

import android.database.sqlite.*; 
import android.content.*; 
import android.database.Cursor; 
import android.util.Log; 
import java.util.ArrayList; 
import java.util.List; 

public class MyDBHandler extends SQLiteOpenHelper { 

private static final int DATABASE_VERSION = 1; //Change whenever db is modified. 
private static final String DATABASE_NAME = "List.db"; //Db name 
public static final String TABLE_NAME = "CustomerList";  //Table Name 
public static final String COLUMN_ID = "Id";     //Column Name 
public static final String COLUMN_CNAME = "Name"; 
public static final String COLUMN_PHNO= "PhoneNumber"; 

public MyDBHandler(Context context, String name,SQLiteDatabase.CursorFactory factory, int version) { 
super(context, DATABASE_NAME, factory, DATABASE_VERSION);  //Context is always background info. 
} 


@Override 
public void onCreate(SQLiteDatabase db) { 
String query = " CREATE TABLE " + TABLE_NAME + " (" + 

     COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT " + " , " + 
     COLUMN_CNAME + " TEXT, " + 
     COLUMN_PHNO + " TEXT " + 
     "); "; 
db.execSQL(query); 



} 

@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
db.execSQL(" DROP TABLE IF EXISTS " + TABLE_NAME); 
onCreate(db); 
} 

public void addProduct(Product product) { 
ContentValues values = new ContentValues(); 
values.put(COLUMN_CNAME, product.get_CName()); 
values.put(COLUMN_PHNO,product.get_phno()); 
SQLiteDatabase db = getWritableDatabase(); 
db.insert(TABLE_NAME, null, values); 
db.close(); 
} 

public void removeProduct(String name) { 
SQLiteDatabase db = getWritableDatabase(); 
db.execSQL(" DELETE FROM " + TABLE_NAME + " WHERE " + COLUMN_CNAME + " =\" " + name + " \"; "); 
} 


public List<Product> getAllContacts(){ 
List<Product> contactList=new ArrayList<Product>(); 
SQLiteDatabase db= this.getWritableDatabase(); 
String Select_query= " SELECT * FROM " + TABLE_NAME + " ORDER BY " + COLUMN_CNAME; 
Cursor cursor= db.rawQuery(Select_query,null); 

if(cursor.moveToFirst()){ 
    do { 
     Product contact= new Product(); 
     contact.set_id(Integer.parseInt(cursor.getString(0))); 
     contact.set_CName(cursor.getString(1)); 
     contact.set_phno(cursor.getString(2)); 
     String name=cursor.getString(1) + "\n"; 
     MainActivity.Array_Names.add(name); 
     contactList.add(contact); 
    }while (cursor.moveToNext()); 
} 

return contactList; 
} 
public Product getProduct(String name){ 
SQLiteDatabase db=this.getWritableDatabase(); 
String query= "SELECT * FROM " + TABLE_NAME + " WHERE " + COLUMN_CNAME + "=\""+ name+"\""; 
Cursor cursor=db.rawQuery(query,null); 
Log.d("This is the Name",name); 
Product product= new Product(); 
if(cursor.moveToFirst()){ 
    cursor.moveToFirst(); 
    product.set_id(Integer.parseInt(cursor.getString(0))); 
    product.set_CName((cursor.getString(1))); 
    product.set_phno(cursor.getString(2)); 
    cursor.close(); 
} 
db.close(); 
return product; 


} 
}

顯示類

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.widget.TextView; 

public class Display extends AppCompatActivity { 

TextView pname; 
TextView pno; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_display); 

Bundle main_data=getIntent().getExtras(); 
String message= main_data.getString("Name"); 
pname=(TextView)findViewById(R.id.pname); 
pno=(TextView)findViewById(R.id.pno); 


pname.setText(message); 
MyDBHandler db=new MyDBHandler(this,null,null,1); 
Product product= db.getProduct(pname.getText().toString()); 
pno.setText(product.get_phno()); 


} 
}

自定義適配器

import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.ImageView; 
import android.widget.TextView; 

import java.util.ArrayList; 
public class CustomAdapter extends ArrayAdapter<String> { 

public CustomAdapter(Context context, ArrayList<String> names) { 
super(context, R.layout.custom_list, names); 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
LayoutInflater myinflater= LayoutInflater.from(getContext()); 
View customView= convertView; 
if(customView==null){ 
    customView=myinflater.inflate(R.layout.custom_list,parent,false); 

} 
String singleItem=getItem(position); 
TextView mytext=(TextView) customView.findViewById(R.id.name); 
ImageView defimage=(ImageView) customView.findViewById(R.id.myimage); 

mytext.setText(singleItem); 
defimage.setImageResource(R.mipmap.contacts_default); 
return customView; 


} 

}

來源

2016-07-10 Mehul

在我看來，在您的顯示類：

@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_display); 

Bundle main_data=getIntent().getExtras(); 
String message= main_data.getString("Name"); 
... 
...

在這裏，您是通過密鑰「名稱」獲得的額外內容，但是在你的聽衆：

mylist.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
      d1.addSortedProduct(); 
      int pass_id=position+1; 
      Bundle data_bundle= new Bundle(); 
      data_bundle.putInt("id",pass_id); 
      intent.putExtras(data_bundle);

您正在傳遞ID，我沒有看到它在顯示Activity中使用。您必須使用該id來知道剛剛點擊的列表中的哪個項目，以便您可以針對不同的項目獲得不同的結果。

糾正我，如果我錯了。

編輯：

我想你應該重寫你的getItemid()方法在你Custom adapter，所以你可以把多餘的作爲你的itemId不使用id_ = position +1交易。

來源

2016-07-10 12:01:05 Lazai

Bundle extras = getIntent（）。getExtras（）; id = extras.getInt（「id」）; nametext =（TextView）findViewById（R.id.nametext）; phoneno =（TextView）findViewById（R.id.phoneno）; MyDBHandler db = new MyDBHandler（this，null，null，1）; 遊標cursor = db.returnCursor（id）; cursor.moveToFirst（）; NAME = cursor.getString（cursor.getColumnIndex（MyDBHandler.COL_NAME））; NUMBER = cursor.getString（cursor.getColumnIndex（MyDBHandler.COL_PHNO））; nametext.setText（NAME）; phoneno.setText（NUMBER）; } – Mehul

我修改了使用extra的代碼作爲傳入的id而不是名稱。對不起，這個錯誤。然而，問題仍然在於如果我搜索名稱Mike，並且當我單擊Mike的搜索結果時，它會打開包含所有聯繫人的原始列表中的第一個聯繫人。我無法理解如何處理這個問題。 – Mehul

我並沒有真正明白你想要達成的目標，但我可以給你一些建議。您應該使用該ID，然後使用內容提供者請參閱：https：//developer.android。COM /引導/主題/供應商/內容providers.html;您應該在展示活動中獲得您想要的結果。因此，請使用您的ID來查詢該聯繫人的結果。 – Lazai

我會在您的listview上使用OnItemClick方法，根據您的個人信息打開新的意圖或新片段供您選擇。

來源

2016-07-10 12:03:54

在Android中使用數據庫實現搜索搜索

回答

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