Question

创建一个简单的注册表单并将值存储在数据库中。用户完成注册后，存储的数据应显示在主页上。在主页上，我创建了一个ListView，其中我想在一行中显示用户给出的用户名以及与其相邻的按钮，点击该按钮后用户应该可以在另一页上看到注册条目。

为此，我尝试使用simpleAdapter，但我认为没有工作或没有正确编程。我还想过使用Expandable ListView但不知道如何使用它。

请帮助我，建议您在ListView中显示注册内容以及如何在ListView中插入按钮执行点击事件。

我的代码是：

HomeActivity.java

package com.nsa.project;

import java.util.ArrayList;
import java.util.HashMap;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MenuItem.OnMenuItemClickListener;
import android.view.SubMenu;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class HomeActivity extends Activity {

    Button btnDetails;
    EditText edtusername;
    ListView details;
    ArrayList<HashMap<String, String>> arraylist = new ArrayList<HashMap<String, String>>();

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

        edtusername = (EditText) findViewById(R.id.edtuser);
        btnDetails = (Button) findViewById(R.id.btndetails);
            details = (ListView) findViewById(R.id.regsdisplay);
    }


    public void displayDetails()
    {
        DataBase d = new DataBase(HomeActivity.this);
        arraylist = d.readDetails();

        //Expandable ListView
        details.setAdapter(new SimpleAdapter(this, arraylist, R.layout.mylayout, new String[] {CT.USER_NAME}, new int[] {R.id.textView1, R.id.btndetails}));
    }

    @Override
    public void onResume()
    {
        // TODO Auto-generated method stub
                super.onResume();
                displayDetails();
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        int groupId = 0;
        int order = 0;
        int itemId = 0 ;
        String title = "My menu";

        // Inflate the menu; this adds items to the action bar if it is present.
        menu.add(title);

        MenuItem mNext = menu.add(groupId, itemId, order, " New User").setIcon(R.drawable.add_user);

            mNext.setOnMenuItemClickListener(new OnMenuItemClickListener(){

                @Override
                public boolean onMenuItemClick(MenuItem item) {
                    // TODO Auto-generated method stub

                    Intent in = new Intent(HomeActivity.this, Registration.class);
                    startActivity(in);
                    return false;
                }

            });

            MenuItem mExit = menu.add(groupId, itemId+1, order+1, "Exit").setIcon(R.drawable.exit);

                mExit.setOnMenuItemClickListener(new OnMenuItemClickListener() {

                    @Override
                    public boolean onMenuItemClick(MenuItem item) {
                        // TODO Auto-generated method stub
                        finish();
                        return false;
                    }
                });

        SubMenu sb = menu.addSubMenu("Create User");
        sb.add(groupId, itemId, order, "First");
        sb.add(groupId, itemId+1, order+1, "2");
        return true;
    }
}

现在，布局

activity_home.xml

<RelativeLayout 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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".HomeActivity" >


    <ListView
        android:id="@+id/regsdisplay"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"></ListView>

</RelativeLayout>

mylayout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="22dp"
        android:text="Large Text"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textColor="#CCBBAA" />

    <Button
        android:id="@+id/btndetails"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:textColor="#FFAAFF"
        android:text="View Details"></Button>    

</LinearLayout>

LOgcat错误

 01-26 23:11:42.643: E/AndroidRuntime(410): FATAL EXCEPTION: main
01-26 23:11:42.643: E/AndroidRuntime(410): java.lang.ArrayIndexOutOfBoundsException
01-26 23:11:42.643: E/AndroidRuntime(410):  at android.widget.SimpleAdapter.bindView(SimpleAdapter.java:160)
01-26 23:11:42.643: E/AndroidRuntime(410):  at android.widget.SimpleAdapter.createViewFromResource(SimpleAdapter.java:126)
01-26 23:11:42.643: E/AndroidRuntime(410):  at android.widget.SimpleAdapter.getView(SimpleAdapter.java:114)
01-26 23:11:42.643: E/AndroidRuntime(410):  at android.widget.AbsListView.obtainView(AbsListView.java:1315)
01-26 23:11:42.643: E/AndroidRuntime(410):  at android.widget.ListView.measureHeightOfChildren(ListView.java:1198)
01-26 23:11:42.643: E/AndroidRuntime(410):  at android.widget.ListView.onMeasure(ListView.java:1109)
01-26 23:11:42.643: E/AndroidRuntime(410):  at android.view.View.measure(View.java:8171)
01-26 23:11:42.643: E/AndroidRuntime(410):  at android.widget.RelativeLayout.measureChild(RelativeLayout.java:563)
01-26 23:11:42.643: E/AndroidRuntime(410):  at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:378)
01-26 23:11:42.643: E/AndroidRuntime(410):  at android.view.View.measure(View.java:8171)
01-26 23:11:42.643: E/AndroidRuntime(410):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
01-26 23:11:42.643: E/AndroidRuntime(410):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
01-26 23:11:42.643: E/AndroidRuntime(410):  at android.view.View.measure(View.java:8171)
01-26 23:11:45.684: I/Process(410): Sending signal. PID: 410 SIG: 9

Answer 1

ListView details未初始化。在setContentView() {/ 1}}之后添加以下内容：

onCreate()

后续details = (ListView)findViewById(R.id.regsdisplay);来到这里：

ArrayIndexOfBoundException

只有一个details.setAdapter(new SimpleAdapter(this, arraylist, R.layout.mylayout, new String[] {CT.USER_NAME}, new int[] {R.id.textView1, R.id.btndetails}));列名称和两个from视图标识符。

Answer 2

我没有看到您初始化ListView details;的任何地方，而且

details.setAdapter(new SimpleAdapter(this, arraylist, R.layout.mylayout, new String[] {CT.USER_NAME}, new int[] {R.id.textView1, R.id.btndetails}));

初始化details。

details = (ListView)findViewById(R.id.regsdisplay);

此外，listview位于activity_home.xml，但我没有看到EditText和Button。

mylayout.xml中的按钮不在activity_home.xml

中

<Button
    android:id="@+id/btndetails"

您发布了一个不完整的布局，或者在引用充气布局的ID时搞砸了。

在ListView中显示内容

2 个答案: