0
如何修改下面的代碼以便每個項目都有兩行而不是一行？我希望mSample部分中的代碼與我發佈的佈局相同，因此請不要不恰當地修改它，除非有必要。下面是一張圖片，描繪了一行的列表。ListView - 將項目從1更改爲2行
我知道單擊事件和列表適配器代碼需要更改，但我不知道該怎麼做。
我也有一個名爲的xml，list_item_entry.xml包含兩個文本視圖（比另一個大一個），但我不確定是否需要使用它。
package com.example.android.animationsdemo;
import android.app.Activity;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
/**
* The launchpad activity for this sample project. This activity launches other activities that
* demonstrate implementations of common animations.
*/
public class MainActivity extends ListActivity {
/**
* This class describes an individual sample (the sample title, and the activity class that
* demonstrates this sample).
*/
private class Sample {
private CharSequence title;
private Class<? extends Activity> activityClass;
public Sample(int titleResId, Class<? extends Activity> activityClass) {
this.activityClass = activityClass;
this.title = getResources().getString(titleResId);
}
@Override
public String toString() {
return title.toString();
}
}
/**
* The collection of all samples in the app. This gets instantiated in {@link
* #onCreate(android.os.Bundle)} because the {@link Sample} constructor needs access to {@link
* android.content.res.Resources}.
*/
private static Sample[] mSamples;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Instantiate the list of samples.
mSamples = new Sample[]{
new Sample(R.string.title_crossfade, CrossfadeActivity.class),
new Sample(R.string.title_card_flip, CardFlipActivity.class),
new Sample(R.string.title_screen_slide, ScreenSlideActivity.class),
new Sample(R.string.title_zoom, ZoomActivity.class),
new Sample(R.string.title_layout_changes, LayoutChangesActivity.class),
};
setListAdapter(new ArrayAdapter<Sample>(this,
android.R.layout.simple_list_item_1,
android.R.id.text1,
mSamples));
}
@Override
protected void onListItemClick(ListView listView, View view, int position, long id) {
// Launch the sample associated with this list position.
startActivity(new Intent(MainActivity.this, mSamples[position].activityClass));
}
}
list_item_entry.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:minHeight="?android:attr/listPreferredItemHeight"
android:gravity="center_vertical"
android:paddingRight="?android:attr/scrollbarSize"
android:baselineAligned="false">
<RelativeLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="10dip"
android:layout_marginRight="6dip"
android:layout_marginTop="6dip"
android:layout_marginBottom="6dip"
android:layout_weight="1">
<TextView android:id="@+id/list_item_entry_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:singleLine="true"
android:textAppearance="?android:attr/textAppearanceLarge"
android:ellipsize="marquee"
android:fadingEdge="horizontal"
/>
<TextView android:id="@+id/list_item_entry_summary"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/list_item_entry_title"
android:layout_alignLeft="@id/list_item_entry_title"
android:textAppearance="?android:attr/textAppearanceSmall"
android:singleLine="true"
android:textColor="?android:attr/textColorSecondary"
/>
</RelativeLayout>
</LinearLayout>
類錯誤
package com.example.android.animationsdemo;
import android.app.Activity;
import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
/**
* The launchpad activity for this sample project. This activity launches other activities that
* demonstrate implementations of common animations.
*/
public class MainActivity extends ListActivity {
/**
* This class describes an individual sample (the sample title, and the activity class that
* demonstrates this sample).
*/
private class Sample {
private CharSequence title;
private CharSequence summary;
private Class<? extends Activity> activityClass;
public Sample(int titleResId, int summaryResId, Class<? extends Activity> activityClass) {
this.activityClass = activityClass;
this.title = getResources().getString(titleResId);
this.summary = getResources().getString(summaryResId);
}
@Override
public String toString() { return title.toString(); return summary.toString(); }
}
/**
* The collection of all samples in the app. This gets instantiated in {@link
* #onCreate(android.os.Bundle)} because the {@link Sample} constructor needs access to {@link
* android.content.res.Resources}.
*/
private static Sample[] mSamples;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Instantiate the list of samples.
mSamples = new Sample[]{
new Sample(R.string.title_crossfade, R.string.summary_crossfade, CrossfadeActivity.class),
new Sample(R.string.title_card_flip, R.string.summary_card_flip, CardFlipActivity.class),
new Sample(R.string.title_screen_slide, R.string.summary_screen_slide, ScreenSlideActivity.class),
new Sample(R.string.title_zoom, R.string.summary_zoom, ZoomActivity.class),
new Sample(R.string.title_layout_changes, R.string.summary_layout_changes, LayoutChangesActivity.class),
};
}
@Override
protected void onListItemClick(ListView listView, View view, int position, long id) {
// Launch the sample associated with this list position.
startActivity(new Intent(MainActivity.this, mSamples[position].activityClass));
}
static class MyAdapter extends BaseAdapter {
static class ViewHolder {
TextView title;
TextView summary;
}
LayoutInflater inflater;
Sample[] mSamples;
public MyAdapter(Context contexts, Sample[] samples) {
this.mSamples = samples;
inflater = LayoutInflater.from(contexts);
}
@Override
public int getCount() {
return mSamples.length;
}
@Override
public Object getItem(int position) {
return mSamples[position];
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.entry, null);
viewHolder = new ViewHolder();
viewHolder.title = (TextView) convertView.findViewById(R.id.list_item_entry_title);
viewHolder.summary = (TextView) convertView.findViewById(R.id.list_item_entry_summary);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.title.setText(mSamples[position].title);
viewHolder.summary.setText(mSamples[position].summary);
return convertView;
}
}
}
哪裏這個類需要去？ – MacaronLover
它可以是你的活動的一個子類 – SorryForMyEnglish
它是否需要在我的活動相同的java文件？ – MacaronLover