我是非常新的android。我需要填充ListView。就像现在一样,我只是添加到一个数组中,然后尝试填充视图。它将从现有数据库中完成。
列表不会显示在listView小部件中。
Main.xml
如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:weightSum="1">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="22sp"
android:textColor="#0000CC"
android:background="#E8E8F0"
android:text="@string/textview1"
android:id="@+id/textview1"
android:autoText="false"/>
<ListView
android:layout_width="match_parent"
android:background="#3399FF"
android:layout_height="461dp"
android:id="@+id/metroList"
/>
</LinearLayout>
我的myActivity
文件:
package com.bkane56.metrolink;
import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
public class MyActivity extends Activity
{
Button button;
TextView textView;
ListView listView;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// button.setOnClickListener(new MyOnClickListener(this));
textView = (TextView) findViewById(R.id.textview1);
listView = (ListView) findViewById(R.id.metroList);
}
}
和我使用arrayAdapter
填写的文件:
package com.bkane56.metrolink;
import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.util.ArrayList;
public class MetroStopList extends ListActivity {
public void onCreate(Bundle saveInstanceState) {
super.onCreate(saveInstanceState);
setContentView(R.layout.main);
ListView metroList = (ListView) findViewById(R.id.metroList);
ArrayList<String> metroStop = new ArrayList<String>();
metroStop.add("LAMBERT MAIN TRML METROLINK STATION");
metroStop.add("LAMBERT EAST TRML METROLINK STATION");
metroStop.add("RICHMOND HEIGHTS METROLINK STATION");
metroStop.add("CLAYTON METROLINK STATION");
metroStop.add("BRENTWOOD METROLINK STATION");
metroStop.add("MAPLEWOOD METROLINK STATION");
metroStop.add("SUNNEN METROLINK STATION");
metroStop.add("FORSYTH METROLINK STATION");
metroStop.add("SHREWSBURY METROLINK STATION");
metroStop.add("NORTH HANLEY METROLINK STATION");
metroStop.add("UMSL NORTH METROLINK STATION");
//more of the same...the list is a total of 36
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, metroStop);
metroList.setAdapter(arrayAdapter);
}
}
任何帮助将不胜感激。我相信当我走得更远时,我会有更多的问题。
答案 0 :(得分:0)
我不确定这个答案对你有帮助吗?如果您认为我不理解您的问题,请告诉我,我会添加更多。
基本上,我不确定你为什么要使用两个.java类。您只能使用一个来填充ListView。此外,使用ListActivity有利于此目的,但在使用时需要注意一些事情。 Here您可以找到关于如何使用ListActivity的解释的好例子。
这是我对您的代码的实现:
<强> MainActivity.java 强>
import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends ListActivity {
private List<String> metroStop;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
metroStop = new ArrayList<String>();
metroStop.add("LAMBERT MAIN TRML METROLINK STATION");
metroStop.add("LAMBERT EAST TRML METROLINK STATION");
metroStop.add("RICHMOND HEIGHTS METROLINK STATION");
metroStop.add("CLAYTON METROLINK STATION");
metroStop.add("BRENTWOOD METROLINK STATION");
metroStop.add("MAPLEWOOD METROLINK STATION");
metroStop.add("SUNNEN METROLINK STATION");
metroStop.add("FORSYTH METROLINK STATION");
metroStop.add("SHREWSBURY METROLINK STATION");
metroStop.add("NORTH HANLEY METROLINK STATION");
metroStop.add("UMSL NORTH METROLINK STATION");
ArrayAdapter<String> myAdapter = new ArrayAdapter<String>(this, R.layout.row_layout, R.id.listText, metroStop);
setListAdapter(myAdapter);
}
}
<强> activity_main.xml中强>
<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=".MainActivity">
<TextView
android:id="@+id/mainText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="My list" />
<ListView
android:id="@android:id/list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/mainText"
android:background="#aaaaaa" />
</RelativeLayout>
<强> row_layout.xml 强>
<?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/listText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:textSize="18sp"
android:textStyle="bold"/>
</LinearLayout>
<强>的AndroidManifest.xml 强>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.populatefromarray" >
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
</manifest>