【发布时间】：2022-11-09 22:21:43
【问题描述】：
我会尽力说清楚。
我正在尝试创建一个项目的滚动视图（假设它是一家商店），我（用户）自己通过应用程序的界面添加它，然后可以通过在滚动视图中单击它来进行修改。 例如，我的主页包含一个按钮和项目列表。当我点击它时，它会打开一个对话框，询问我要添加的项目的信息。完成配置项目后，我回到主页，可以看到刚刚添加的项目，如果需要，我可以单击它进行修改。
我在这里遇到的问题是，在滚动视图中我们必须添加视图。即使我知道如何通过 java 来完成，我如何为每个新项目添加一个 clicklistener ？考虑到我只能设置 int ids 的事实，如何为每个新视图（项目）设置 id？等等
有人知道我尝试做的任何方法吗？为了清楚起见，我将在这里制作一个非常简单的代码和界面截图示例。
我的 XML 主页：“activity_main.xml”
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="@+id/popUpAddItem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add Your Item"
tools:ignore="MissingConstraints">
</Button>
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/scrollViewItems">
<!-- this LinearLayout is an exemple of the shape/structure of an item -->
<LinearLayout
android:clickable="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:id="@+id/protoItem">
<TextView
android:clickable="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" Item1 "
android:id="@+id/protoName">
</TextView>
<TextView
android:clickable="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" Qt1 "
android:id="@+id/protoQuantity">
</TextView>
<TextView
android:clickable="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" Price1 "
android:id="@+id/protoPrice">
</TextView>
</LinearLayout>
</ScrollView>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
自定义弹出窗口的 XML：“dialog_popup.xml”
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="@+id/window"
tools:ignore="MissingConstraints">
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/itemName"
android:hint="Enter the name of the item">
</EditText>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/itemQuantity"
android:hint="Enter the quantity of the item">
</EditText>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/itemPrice"
android:hint="Enter the price the item">
</EditText>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Valider"
android:id="@+id/validationButton">
</Button>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
创建自定义弹出窗口的类：“CreateCustomPopUp.java
package com.example.myapplication;
import android.app.Activity;
import android.app.Dialog;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
public class CreateCustomPopUp extends Dialog {
private LinearLayout page;
private EditText name, quantity, price;
private Button validation;
private String varName="";
private int varQt= 0;
private float varPrice =0;
public CreateCustomPopUp(Activity activity)
{
super(activity, androidx.appcompat.R.style.Theme_AppCompat_Dialog);
setContentView(R.layout.dialog_popup);
this.page = findViewById(R.id.window);
this.name = findViewById(R.id.itemName);
this.price = findViewById(R.id.itemPrice);
this.quantity = findViewById(R.id.itemQuantity);
this.validation = findViewById(R.id.validationButton);
validation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
varName=name.getText().toString();
varQt=Integer.valueOf(quantity.getText().toString());
varPrice=Float.valueOf(price.getText().toString());
dismiss();
}
});
}
public void build()
{
show();
}
public int getQt(){
return varQt;
}
public String getName(){
return varName;
}
public float getPrice(){
return varPrice;
}
}
主要活动 Java：“MainActivity.java”
package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import android.content.DialogInterface;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
public class MainActivity extends AppCompatActivity {
public MainActivity activity;
public String name ="";
public int qt =0;
public float price = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.activity=this;
Button addItem = (Button) findViewById(R.id.popUpAddItem);
addItem.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
CreateCustomPopUp popUp = new CreateCustomPopUp(activity);
popUp.build();
popUp.setOnDismissListener(new DialogInterface.OnDismissListener() {
@Override
public void onDismiss(DialogInterface dialogInterface) {
name = popUp.getName();
qt = popUp.getQt();
price = popUp.getPrice();
//Put/call here a function/class or whatever works that add this created item in the scrollview
}
});
}
});
LinearLayout prototypeItem = (LinearLayout) findViewById(R.id.protoItem);
prototypeItem.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// Another popup that I'm borred to create, but I think you see the idea...
}
});
// and here is my issue : I cant reproduce this "set on click listener" for each item... because they dont already exist and I dont know how many I'll have !
}
}
希望它很清楚，你可以帮助我^^
再见
【问题讨论】：
标签： java android xml android-studio scrollview