Android 如何在资产数据库文件的listview项中设置OnClickListener
我想问一下你的情况。我在listview中调用了外部数据库文件[assets folder]。我想在listview中的每个项目上设置onClicklistener。当listview项目单击时,希望显示一个带有数据字段的小片段。我尝试了许多源代码,但仍然无法工作 下面是我们想要做的示例片段。 下面是数据库结构。 下面是DatabaseHelper.javaAndroid 如何在资产数据库文件的listview项中设置OnClickListener,android,listview,android-fragments,Android,Listview,Android Fragments,我想问一下你的情况。我在listview中调用了外部数据库文件[assets folder]。我想在listview中的每个项目上设置onClicklistener。当listview项目单击时,希望显示一个带有数据字段的小片段。我尝试了许多源代码,但仍然无法工作 下面是我们想要做的示例片段。 下面是数据库结构。 下面是DatabaseHelper.java package com.example.arlequina.sqlitefromassetexample.database; imp
package com.example.arlequina.sqlitefromassetexample.database;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import com.example.arlequina.sqlitefromassetexample.model.Product;
import java.util.ArrayList;
import java.util.List;
import java.sql.Blob;
/**
* Created by ARLEQUINA on 2/10/2017.
*/
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String dbname = "sample.db";
public static final String dblocation = "/data/data/com.example.arlequina.sqlitefromassetexample/databases/";
private Context mContext;
private SQLiteDatabase mDatabase;
public DatabaseHelper(Context context){
super(context, dbname, null, 1);
this.mContext = context;
}
@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
}
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
}
public void openDatabase(){
String dbPath = mContext.getDatabasePath(dbname).getPath();
if(mDatabase != null && mDatabase.isOpen()){
return;
}
mDatabase = SQLiteDatabase.openDatabase(dbPath, null, SQLiteDatabase.OPEN_READWRITE);
}
public void closeDatabase(){
if(mDatabase != null){
mDatabase.close();
}
}
public List<Product> getListProduct(){
Product product = null;
List<Product> productList = new ArrayList<>();
openDatabase();
Cursor cursor = mDatabase.rawQuery(" SELECT * FROM Product ", null);
cursor.moveToFirst();
while(!cursor.isAfterLast()){
product = new Product(cursor.getInt(0), cursor.getString(1), cursor.getString(2),cursor.getString(3));
productList.add(product);
cursor.moveToNext();
}
cursor.close();
closeDatabase();
return productList;
}
}
您可以使用
listview.setOnItemClickListener
或v.setOnClickListener
来解决您的问题。这是最基本的,伙计。因为您的问题是使列表项可单击,所以您可以在活动中初始化listview之后使用此选项
lvProduct.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
});
lvProduct.setOnItemClickListener(新的AdapterView.OnItemClickListener(){
@凌驾
public void onItemClick(AdapterView父对象、视图、整型位置、长id){
}
});
position
是列表中单击项目的位置。因此,您可以使用mpProductList.get(position)
在您可以获得该物品后,现在是展示您的物品的时候了。您可以使用自定义对话框
使其与演示类似(当然,您必须再创建一个xml):
检查此官方链接中的“自定义”对话框:您的问题可能不清楚。关于
setOnClickListener
或读取数据库的问题?是的,关于setOnClickListener,我是as的新成员,所以如何在片段中显示数据?我需要创建新的xml文件吗?当然,首先创建布局文件,然后在片段中覆盖onCreateView
,以扩大布局。非常感谢兄弟。:)
package com.example.arlequina.sqlitefromassetexample;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.example.arlequina.sqlitefromassetexample.adapter.ListProductAdapter;
import com.example.arlequina.sqlitefromassetexample.database.DatabaseHelper;
import com.example.arlequina.sqlitefromassetexample.model.Product;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;
/**
* Created by ARLEQUINA on 2/10/2017.
*/
public class MainActivity extends Activity {
private ListView lvProduct;
private ListProductAdapter adapter;
private List<Product> mProductList;
private DatabaseHelper mDBHelper;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lvProduct = (ListView)findViewById(R.id.listview_product);
mDBHelper = new DatabaseHelper(this);
//Check exists database
File database = getApplicationContext().getDatabasePath(DatabaseHelper.dbname);
if(false == database.exists()){
mDBHelper.getReadableDatabase();
//Copy db
if(copyDatabase(this)){
Toast.makeText(this,"Copy database success", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(this, "Copy data error", Toast.LENGTH_SHORT).show();
return;
}
}
//Get product list in db when db exists
mProductList = mDBHelper.getListProduct();
//Init adapter
adapter = new ListProductAdapter(this,mProductList);
//Set adapter for listview
lvProduct.setAdapter(adapter);
}
private boolean copyDatabase(Context context){
try{
InputStream inputStream = context.getAssets().open(DatabaseHelper.dbname);
String outFileName = DatabaseHelper.dblocation + DatabaseHelper.dbname;
OutputStream outputStream = new FileOutputStream(outFileName);
byte[] buff = new byte[1024];
int length = 0;
while((length = inputStream.read(buff)) > 0){
outputStream.write(buff, 0, length);
}
outputStream.flush();
outputStream.close();
Log.v("MainActivity", "DB copied");
return true;
} catch(Exception e){
e.printStackTrace();
return false;
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
android:paddingBottom="5dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingTop="5dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv_product_name"
android:text = "Name"
android:textColor="#4bb6d6"
android:textSize="20dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id = "@+id/tv_product_price"
android:text="100$"
android:textColor="#b30000"
android:textSize="18dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id = "@+id/tv_product_desc"
android:text="Description"
android:textSize="16dp"
android:textStyle="italic"/>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#d1d1d1">
<ListView
android:id = "@+id/listview_product"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
android:divider="#d1d1d1"
android:dividerHeight="10dp"></ListView>
</LinearLayout>
package com.example.arlequina.sqlitefromassetexample.model;
import java.sql.Blob;
/**
* Created by ARLEQUINA on 2/10/2017.
*/
public class Product {
private int id;
private String name;
private String price;
private String desc;
//private Blob img;
public Product(int id, String name, String price, String desc){
this.id = id;
this.name = name;
this.price = price;
this.desc = desc;
//this.img = img;
}
public int getId(){
return id;
}
public void setId(int id){
this.id = id;
}
public String getName(){
return name;
}
public void setName(String name){
this.name = name;
}
public String getPrice(){
return price;
}
public void setPrice(String price){
this.price = price;
}
public String getDesc(){
return desc;
}
public void setDesc(String desc){
this.desc = desc;
}
}
lvProduct.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
});