Java 根据listView单击更改编辑文本
大家好,我正在寻找一些帮助和建议与我的应用程序,目前我有一个自定义适配器打印出每行,在每行它打印两个按钮,一个按钮增加和一个按钮减少。我想要发生的是,当单击按钮时,listView外部的editText(totalCost)会发生更改。我不知道如何去做这件事,因为我对android和java非常陌生,所以任何帮助都会很好。谢谢 我正在使用的自定义适配器是Java 根据listView单击更改编辑文本,java,android,xml,Java,Android,Xml,大家好,我正在寻找一些帮助和建议与我的应用程序,目前我有一个自定义适配器打印出每行,在每行它打印两个按钮,一个按钮增加和一个按钮减少。我想要发生的是,当单击按钮时,listView外部的editText(totalCost)会发生更改。我不知道如何去做这件事,因为我对android和java非常陌生,所以任何帮助都会很好。谢谢 我正在使用的自定义适配器是 package com.example.rory.dbtest; import android.content.Context; import
package com.example.rory.dbtest;
import android.content.Context;
import android.database.Cursor;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.CursorAdapter;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.pinchtapzoom.R;
public class CustomCursorAdapter extends CursorAdapter{
public int counter = 0;
public CustomCursorAdapter(Context context, Cursor c) {
super(context, c);
this.context = context;
}
Context context;
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
// when the view will be created for first time,
// we need to tell the adapters, how each item will look
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View retView = inflater.inflate(R.layout.row, parent, false);
return retView;
}
public void bindView(View view, Context context, Cursor cursor) {
// here we are setting our data
// that means, take the data from the cursor and put it in views
TextView textViewPersonName = (TextView) view.findViewById(R.id.item1);
textViewPersonName.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(1))));
final EditText edit1 = (EditText) view.findViewById(R.id.runningTotal);
Button plusButton = (Button) view.findViewById(R.id.plusButton);
plusButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
counter++;
edit1.setText(Integer.toString(counter));
}
});
Button minusButton = (Button) view.findViewById(R.id.minusButton);
minusButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
counter--;
edit1.setText(Integer.toString(counter));
}
});
}
}
这是我希望editText(TotalCost)根据单击进行更改的主要活动
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.os.Handler;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;
import com.pinchtapzoom.R;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.SQLException;
public class MyActivity extends Activity {
private CustomCursorAdapter customAdapter;
public ListView list1;
com.example.rory.dbtest.DBAdapter db = new com.example.rory.dbtest.DBAdapter(this);
public EditText TotalCost;
//public EditText TotalLitres;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
list1 = (ListView)findViewById(R.id.data_list);
db.open();
Button addBtn = (Button)findViewById(R.id.add);
addBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(MyActivity.this, addassignment.class);
startActivity(i);
}
});
Button deleteBtn = (Button)findViewById(R.id.delete);
deleteBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(MyActivity.this, Delete.class);
startActivity(i);
}
});
Button updateBtn = (Button)findViewById(R.id.update);
updateBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(MyActivity.this, Update.class);
startActivity(i);
}
});
try {
String destPath = "/data/data/" + getPackageName() + "/databases/AssignmentDB";
File f = new File(destPath);
if (!f.exists()) {
CopyDB( getBaseContext().getAssets().open("mydb"),
new FileOutputStream(destPath));
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
new Handler().post(new Runnable() {
@Override
public void run() {
//Log.d("test", "customadapter is " + customAdapter.toString());
//Log.d("test", "databaseHelper is " + databaseHelper.toString());
customAdapter = new CustomCursorAdapter(MyActivity.this, db.getAllRecords());
list1.setAdapter(customAdapter);
}
});
}
private class DBAdapter extends BaseAdapter {
private LayoutInflater mInflater;
//private ArrayList<>
@Override
public int getCount() {
return 0;
}
@Override
public Object getItem(int arg0) {
return null;
}
@Override
public long getItemId(int arg0) {
return 0;
}
@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
return null;
}
}
public void CopyDB(InputStream inputStream, OutputStream outputStream)
throws IOException {
//---copy 1K bytes at a time---
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) > 0) {
outputStream.write(buffer, 0, length);
}
inputStream.close();
outputStream.close();
}
}
导入android.app.Activity;
导入android.content.Intent;
导入android.database.Cursor;
导入android.database.sqlite.SQLiteDatabase;
导入android.os.Bundle;
导入android.util.Log;
导入android.view.LayoutInflater;
导入android.os.Handler;
导入android.view.view;
导入android.view.ViewGroup;
导入android.widget.AdapterView;
导入android.widget.BaseAdapter;
导入android.widget.Button;
导入android.widget.EditText;
导入android.widget.ListView;
导入android.widget.Toast;
导入com.pinchtapzoom.R;
导入java.io.File;
导入java.io.FileNotFoundException;
导入java.io.FileOutputStream;
导入java.io.IOException;
导入java.io.InputStream;
导入java.io.OutputStream;
导入java.sql.SQLException;
公共类MyActivity扩展了活动{
私有CustomCursorAdapter customAdapter;
公共列表视图列表1;
com.example.rory.dbtest.DBAdapter db=new com.example.rory.dbtest.DBAdapter(this);
公共成本;
//公共编辑;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
list1=(ListView)findViewById(R.id.data\u列表);
db.open();
按钮addBtn=(按钮)findviewbyd(R.id.add);
addBtn.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
意图i=新意图(MyActivity.this、addassignment.class);
星触觉(i);
}
});
按钮deleteBtn=(按钮)findViewById(R.id.delete);
deleteBtn.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
意图i=新意图(MyActivity.this,Delete.class);
星触觉(i);
}
});
按钮更新btn=(按钮)findViewById(R.id.update);
updateBtn.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
意图i=新意图(MyActivity.this、Update.class);
星触觉(i);
}
});
试一试{
字符串destPath=“/data/data/”+getPackageName()+“/databases/AssignmentDB”;
文件f=新文件(destPath);
如果(!f.exists()){
CopyDB(getBaseContext().getAssets().open(“mydb”),
新文件输出流(destPath));
}
}catch(filenotfounde异常){
e、 printStackTrace();
}捕获(IOE异常){
e、 printStackTrace();
}
new Handler().post(new Runnable()){
@凌驾
公开募捐{
//Log.d(“test”,“customadapter是”+customadapter.toString());
//d(“test”,“databaseHelper是”+databaseHelper.toString());
customAdapter=new CustomCursorAdapter(MyActivity.this,db.getAllRecords());
列表1.setAdapter(customAdapter);
}
});
}
私有类DBAdapter扩展BaseAdapter{
私人停车场;
//私人ArrayList
@凌驾
public int getCount(){
返回0;
}
@凌驾
公共对象getItem(int arg0){
返回null;
}
@凌驾
公共长getItemId(int arg0){
返回0;
}
@凌驾
公共视图getView(int arg0、视图arg1、视图组arg2){
返回null;
}
}
public void CopyDB(InputStream InputStream,OutputStream OutputStream)
抛出IOException{
//---一次复制1K字节---
字节[]缓冲区=新字节[1024];
整数长度;
而((长度=inputStream.read(缓冲区))>0){
写入(缓冲区,0,长度);
}
inputStream.close();
outputStream.close();
}
}
以及适配器的XML文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<TextView android:id="@+id/item1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="item"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:textSize="30sp"
android:paddingBottom="5dp"/>
<Button
android:id="@+id/plusButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/plusButton"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<EditText
android:id="@+id/runningTotal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toLeftOf="@+id/minusButton"
android:layout_toStartOf="@+id/minusButton"
android:layout_marginRight="30dp" />
<Button
android:id="@+id/minusButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/minusButton"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>
您应该使用界面 1) 创建接口类:
public interface MyAdapterInterface {
public void updateEditText(String value);
}
2) 将适配器更改为:
public class CustomCursorAdapter extends CursorAdapter{
public int counter = 0;
private MyAdapterInterface mMyInterface;
public CustomCursorAdapter(Context context, Cursor c, MyAdapterInterface myInterface) {
super(context, c);
this.context = context;
this.mMyInterface = myInterface;
}
Context context;
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
// when the view will be created for first time,
// we need to tell the adapters, how each item will look
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View retView = inflater.inflate(R.layout.row, parent, false);
return retView;
}
public void bindView(View view, Context context, Cursor cursor) {
// here we are setting our data
// that means, take the data from the cursor and put it in views
TextView textViewPersonName = (TextView) view.findViewById(R.id.item1);
textViewPersonName.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(1))));
final EditText edit1 = (EditText) view.findViewById(R.id.runningTotal);
Button plusButton = (Button) view.findViewById(R.id.plusButton);
plusButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
counter++;
edit1.setText(Integer.toString(counter));
mMyInterface.updateEditText(/*YOUR VALUE*/);
}
});
Button minusButton = (Button) view.findViewById(R.id.minusButton);
minusButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
counter--;
edit1.setText(Integer.toString(counter));
mMyInterface.updateEditText(/*YOUR VALUE*/);
}
});
}
}
3) 在活动中实现接口:
public class MyActivity extends Activity implements MyAdapterInterface {
private CustomCursorAdapter customAdapter;
public ListView list1;
com.example.rory.dbtest.DBAdapter db = new com.example.rory.dbtest.DBAdapter(this);
public EditText TotalCost;
//public EditText TotalLitres;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
list1 = (ListView)findViewById(R.id.data_list);
db.open();
Button addBtn = (Button)findViewById(R.id.add);
addBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(MyActivity.this, addassignment.class);
startActivity(i);
}
});
Button deleteBtn = (Button)findViewById(R.id.delete);
deleteBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(MyActivity.this, Delete.class);
startActivity(i);
}
});
Button updateBtn = (Button)findViewById(R.id.update);
updateBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(MyActivity.this, Update.class);
startActivity(i);
}
});
try {
String destPath = "/data/data/" + getPackageName() + "/databases/AssignmentDB";
File f = new File(destPath);
if (!f.exists()) {
CopyDB( getBaseContext().getAssets().open("mydb"),
new FileOutputStream(destPath));
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
new Handler().post(new Runnable() {
@Override
public void run() {
//Log.d("test", "customadapter is " + customAdapter.toString());
//Log.d("test", "databaseHelper is " + databaseHelper.toString());
customAdapter = new CustomCursorAdapter(MyActivity.this, db.getAllRecords(), this);
list1.setAdapter(customAdapter);
}
});
@Override
public void updateEditText(String value) {
EditText myEditText = (EditText)findViewById(R.id./*YOUR EDITTEXT ID*/);
myEditText.setText(value);
}
}
private class DBAdapter extends BaseAdapter {
private LayoutInflater mInflater;
//private ArrayList<>
@Override
public int getCount() {
return 0;
}
@Override
public Object getItem(int arg0) {
return null;
}
@Override
public long getItemId(int arg0) {
return 0;
}
@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
return null;
}
}
public void CopyDB(InputStream inputStream, OutputStream outputStream)
throws IOException {
//---copy 1K bytes at a time---
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) > 0) {
outputStream.write(buffer, 0, length);
}
inputStream.close();
outputStream.close();
}
}
公共类MyActivity扩展活动实现MyAdapterInterface{
私有CustomCursorAdapter customAdapter;
公共列表视图列表1;
com.example.rory.dbtest.DBAdapter db=new com.example.rory.dbtest.DBAdapter(this);
公共成本;
//公共编辑;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
list1=(ListView)findViewById(R.id.data\u列表);
db.open();
按钮addBtn=(按钮)findviewbyd(R.id.add);
addBtn.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
意图i=新意图(MyActivity.this、addassignment.class);
星触觉(i);
}
});
按钮deleteBtn=(按钮)findViewById(R.id.delete);
deleteBtn.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
意图一=