我是一个新的Android开发人员，我正在使用ListView在数据库中显示列表视图的所有值，这是Sqlite，我正在使用列表活动扩展主活动。这是我的代码：
主要活动
package com.example.sqliteapplication;
import java.util.List;
import android.app.Activity;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ImageButton;
import android.widget.ListView;
public class SmsMerge extends ListActivity {
private ImageButton imgb;
private TemplateOperation templateDBoperation;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sms_merge);
templateDBoperation = new TemplateOperation(this);
templateDBoperation.open();
List values = templateDBoperation.getAllTemplate();
ListView listview = (ListView)findViewById(android.R.id.list);
// Use the SimpleCursorAdapter to show the
// elements in a ListView
ArrayAdapter adapter = new ArrayAdapter(this,
R.layout.row, values);
listview.setAdapter(adapter);
imgb=(ImageButton)findViewById(R.id.btnaddtemplate);
imgb.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Log.d("hy humayoon", "kdmfoskfvodfkbij");
Intent intent = new Intent(SmsMerge.this, SqliteActivity.class);
startActivity(intent);
}
});
}
}
这是我的activity_sms_merge.xml布局代码：
<LinearLayout 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:background="@layout/bg_player_header"
android:orientation="vertical"
tools:context="com.SMS.smsmerge.SmsMergeActivity$PlaceholderFragment" >
<LinearLayout
android:id="@+id/player_header_bg"
android:layout_width="fill_parent"
android:layout_height="60dip"
android:background="@layout/bg_player_header"
android:layout_alignParentTop="true"
android:paddingLeft="5dp"
android:paddingRight="5dp">
<TextView
android:id="@+id/songTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textColor="#04b3d2"
android:textSize="16dp"
android:paddingLeft="10dp"
android:textStyle="bold"
android:text="Templates"
android:layout_marginTop="10dp"/>"
<!-- Sttting button -->
<ImageButton
android:id="@+id/btnsetting"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:src="@drawable/settings"
android:background="@null"
/>
<!-- add template button -->
<ImageButton
android:id="@+id/btnaddtemplate"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:src="@drawable/btn_add"
android:background="@null"
/>
</LinearLayout>
<ListView
android:id="@android:id/list"
android:layout_width="match_parent"
android:divider="#FFEEEE"
android:dividerHeight="2dp"
android:layout_height="wrap_content"
>
</ListView>
</LinearLayout>
这是Row.xml代码：
<?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/lblListItem"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:textSize="15dp"
android:paddingTop="5dp"
android:paddingBottom="5dp"
android:textColor="#daac56"
android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft" />
<ImageView
android:id="@+id/img"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"/>
</LinearLayout>
以下是错误：
05-07 13:00:29.376: W/dalvikvm(25083): threadid=1: thread exiting with uncaught exception (group=0x40f199a8)
05-07 13:00:29.395: E/AndroidRuntime(25083): FATAL EXCEPTION: main
05-07 13:00:29.395: E/AndroidRuntime(25083): java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:386)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.widget.AbsListView.obtainView(AbsListView.java:2207)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.widget.ListView.measureHeightOfChildren(ListView.java:1250)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.widget.ListView.onMeasure(ListView.java:1162)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.view.View.measure(View.java:15609)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4916)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1411)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.widget.LinearLayout.measureVertical(LinearLayout.java:698)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.view.View.measure(View.java:15609)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4916)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.view.View.measure(View.java:15609)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.widget.LinearLayout.measureVertical(LinearLayout.java:850)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.view.View.measure(View.java:15609)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4916)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
05-07 13:00:29.395: E/AndroidRuntime(25083): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2191)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.view.View.measure(View.java:15609)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2165)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1249)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1443)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1139)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4879)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:776)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.view.Choreographer.doCallbacks(Choreographer.java:579)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.view.Choreographer.doFrame(Choreographer.java:548)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:762)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.os.Handler.handleCallback(Handler.java:725)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.os.Handler.dispatchMessage(Handler.java:92)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.os.Looper.loop(Looper.java:153)
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.app.ActivityThread.main(ActivityThread.java:5299)
05-07 13:00:29.395: E/AndroidRuntime(25083): at java.lang.reflect.Method.invokeNative(Native Method)
05-07 13:00:29.395: E/AndroidRuntime(25083): at java.lang.reflect.Method.invoke(Method.java:511)
05-07 13:00:29.395: E/AndroidRuntime(25083): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
05-07 13:00:29.395: E/AndroidRuntime(25083): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
05-07 13:00:29.395: E/AndroidRuntime(25083): at dalvik.system.NativeStart.main(Native Method)
05-07 13:00:29.395: E/AndroidRuntime(25083): Caused by: java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.TextView
05-07 13:00:29.395: E/AndroidRuntime(25083): at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:379)
05-07 13:00:29.395: E/AndroidRuntime(25083): ... 38 more
答案 0 :(得分：0)
此行引发问题
// elements in a ListView
ArrayAdapter adapter = new ArrayAdapter(this,
R.layout.row, values);
将此更改为
ArrayAdapter<String> adapt = new ArrayAdapter<String>(this, R.layout.row, R.id.YOUR_TEXT_VIEW, values);
答案 1 :(得分：0)
您正在使用arrayadapter作为列表视图。作为参数传递给arrayadapter构造函数的行必须是textview。请参阅http://developer.android.com/reference/android/widget/ArrayAdapter.html
如果要自定义列表视图行，则需要使用扩展arrayadapter类的自定义arrayadapter。请参考
http://www.vogella.com/tutorials/AndroidListView/article.html
用于自定义数据适配器。
答案 2 :(得分：0)
你不能在ArrayAdapter中简单地应用你自己的行布局，你必须创建一个自定义适配器来制作带有图像的列表视图
根据以下代码更改smsMerge类中的代码
lv = (ListView) findViewById(R.id.listView);
lv.setVerticalFadingEdgeEnabled(true);
// Set an Adapter to the ListView
adapter = new CustomListAdapter(this);
lv.setAdapter(adapter);
并将此类添加为内部类
class CustomListAdapter extends BaseAdapter {
private LayoutInflater layoutInflater;
public CustomListAdapter(ListActivity activity) {
layoutInflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
count// Set the total list item count
return count;
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Inflate the item layout and set the views
View listItem = convertView;
int pos = position;
List_item item;
if (listItem == null)
{
listItem = layoutInflater.inflate(R.layout.ROW, null);
item=new List_item();
item.iv = (ImageView) listItem.findViewById(R.id.thumb);
//item.tvTitle = (TextView) listItem.findViewById(R.id.title);
//item.tvDate = (TextView) listItem.findViewById(R.id.date);
//item.arrow= (ImageView) listItem.findViewById(R.id.arrow);
}
else
{
item=(List_item)listItem.getTag();
}
item.iv.setImageResource(values.get(pos));// where values give us resource id
listItem.setTag(item);
return listItem;
}
}
并将此类添加为内部类
public class List_item
{
ImageView iv;
//TextView tvTitle ;
//TextView tvDate ;
//ImageView arrow;
}