我尝试调用notifyDataSetChange（）来重绘ArrayAdapter中的数据，但是ArrayAdapter中的整个数据将被重绘两次。
这是activity_search.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">
<view
class = "com.search.widget.ClearableEditText"
android:id = "@+id/searchText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Search Tours"
android:maxLines="1"
android:singleLine="true"
/>
<ListView
android:id="@+id/result_list"
android:cacheColorHint="#00000000"
android:scrollbars="none"
android:fadingEdge="vertical"
android:soundEffectsEnabled="true"
android:divider="@color/Orange"
android:dividerHeight="1px"
android:padding="0dip"
android:smoothScrollbar="true"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:drawSelectorOnTop="false"
android:layout_marginTop="5dip"
android:layout_marginLeft="5dip"
android:layout_marginRight="5dip"
android:layout_marginBottom="5dip"
android:layout_weight="1"/>
<ProgressBar
android:id="@+id/loadingResult"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:visibility="gone" />
</LinearLayout>
这是每行的布局是listView：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rows"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:id="@+id/Tours"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text=""
android:gravity="center"
android:layout_weight="1"/>
<TextView
android:id="@+id/Authors"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:gravity="center"
android:text=""
android:layout_weight="1"/>
</LinearLayout>
以下是我初始化ListView和ArrayAdapter的方法：
resultiew = (ListView) findViewById(R.id.result_list);
this.myadp = new myAdapter(this, android.R.layout.simple_list_item_1,
results);
resultiew.setAdapter(myadp);
// render result
resultChangeListener();
resultChangeListerner（）是一个线程，用于在更新应该绘制的数据时调用notifyDataSetChange（），这里是代码：
private void resultChangeListener() {
new Thread() {
public void run() {
while (true) {
try {
if (SearchActivity.listModified == true) {
runOnUiThread(new Runnable() {
@Override
public void run() {
SearchActivity.listModified = false;
resetInfos();
Log.e("change search location result",
"there");
System.out.println("adapter size:"
+ myadp.list.size());
myadp.notifyDataSetChanged();
System.out.println("listview count: "
+ resultiew.getCount());
}
});
}
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}.start();
}
SearchActivity.listModified指示数据的更新位置。
这是resetInfos（）的代码，它清除结果集并向其添加内容。
private void resetInfos() {
results.clear();
toursTextViews.clear();
authorsTextViews.clear();
results.addAll(labels);
}
以下是我的ArrayAdapter：
private class myAdapter extends ArrayAdapter<String> {
public myAdapter(Context context, int resource, List<String> objects) {
super(context, resource, objects);
this.list = objects;
}
View row;
private List<String> list;
public View getView(int position, View convertView, ViewGroup parent) {
{
String rowMetaContent[] = this.list.get(position).split(
SearchActivity.delimiter);
LayoutInflater inflater = getLayoutInflater();
row = inflater.inflate(R.layout.search_results_row_layout,
parent, false);
if (position == 0) {
TextView headerTours = (TextView) row
.findViewById(R.id.Tours);
TextView headerAuthors = (TextView) row
.findViewById(R.id.Authors);
setHeaderStyle(headerTours, "Tours");
setHeaderStyle(headerAuthors, "Authors");
}
else {
try {
TextView headerTours = (TextView) row
.findViewById(R.id.Tours);
TextView headerAuthors = (TextView) row
.findViewById(R.id.Authors);
switch (rowMetaContent.length) {
case 7:
headerTours.setPadding(4, 16, 1, 16);
headerTours.setTextColor(Color.BLACK);
this.setTextStyle(headerTours, rowMetaContent[0]);
keyWordSearchTours.add(rowMetaContent[2]);
toursTextViews.add(headerTours);
headerTours.setOnClickListener(onclicklistener);
headerAuthors.setPadding(4, 16, 1, 16);
headerAuthors.setTextColor(Color.BLACK);
authorsTextViews.add(headerAuthors);
headerAuthors.setOnClickListener(onclicklistener);
this.setTextStyle(headerAuthors, rowMetaContent[4]);
break;
case 4:
headerTours.setPadding(4, 16, 1, 16);
headerTours.setTextColor(Color.BLACK);
this.setTextStyle(headerTours, rowMetaContent[0]);
keyWordSearchTours.add(rowMetaContent[2]);
toursTextViews.add(headerTours);
headerTours.setOnClickListener(onclicklistener);
headerAuthors.setPadding(4, 16, 1, 16);
headerAuthors.setTextColor(Color.BLACK);
break;
default:
headerTours.setPadding(4, 16, 1, 16);
headerTours.setTextColor(Color.BLACK);
// this.setTextStyle(headerTours, "");
keyWordSearchTours.add("");
headerAuthors.setPadding(4, 16, 1, 16);
headerAuthors.setTextColor(Color.BLACK);
this.setTextStyle(headerAuthors, rowMetaContent[0]);
authorsTextViews.add(headerAuthors);
headerAuthors.setOnClickListener(onclicklistener);
break;
}
System.out.println(this.list.get(position));
System.out.println(list.size());
} catch (Exception e) {
e.printStackTrace();
}
}
return row;
}
}
public void setHeaderStyle(TextView textView, String header) {
textView.setBackgroundResource(R.layout.customshape_header);
textView.setPadding(4, 2, 1, 1);
row.setEnabled(false);
textView.setEnabled(false);
textView.setTextColor(Color.BLACK);
textView.setText(header);
}
public void setTextStyle(TextView textView, String result) {
try {
// replace all * in result
String partString[] = result.split("\\$");
String newResult = partString[0];
int start = Integer.parseInt(partString[1]);
int end = Integer.parseInt(partString[2]);
final SpannableStringBuilder sb = new SpannableStringBuilder(
newResult);
final ForegroundColorSpan fcs = new ForegroundColorSpan(
Color.rgb(255, 97, 0));
final StyleSpan bss = new StyleSpan(
android.graphics.Typeface.BOLD);
sb.setSpan(fcs, start, end + 1,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
sb.setSpan(bss, start, end + 1,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
// make them also bold
textView.setText(sb);
} catch (Exception e) {
System.out.println("error: " + result);
Log.d("exception error", e.toString());
}
}
}
以下是LogCat的输出，ArrayAdapter中的列表大小为3，但getView（）被调用了6次。
09-20 15:47:35.530: I/System.out(4095): adapter size:3
09-21 15:47:35.530: I/System.out(4095): Position: 1
09-21 15:47:35.530: I/System.out(4095): josh's tour1$0$3###@@@Content###@@@josh-1410695945754###@@@Tours###@@@josh$0$3###@@@Content###@@@Authors
09-21 15:47:35.530: I/System.out(4095): Position: 2
09-21 15:47:35.530: I/System.out(4095): joshua's tour$0$3###@@@Content###@@@joshua's_tour-1409049012110###@@@Tours###@@@joshua$0$3###@@@Content###@@@Authors
09-21 15:47:35.540: I/System.out(4095): Position: 3
09-21 15:47:35.540: I/System.out(4095): joshua's tour$0$3###@@@Content###@@@joshua's_tour-1408968854379###@@@Tours###@@@joshua$0$3###@@@Content###@@@Authors
09-21 15:47:35.550: I/System.out(4095): Position: 1
09-21 15:47:35.550: I/System.out(4095): josh's tour1$0$3###@@@Content###@@@josh-1410695945754###@@@Tours###@@@josh$0$3###@@@Content###@@@Authors
09-21 15:47:35.560: I/System.out(4095): Position: 2
09-21 15:47:35.560: I/System.out(4095): joshua's tour$0$3###@@@Content###@@@joshua's_tour-1409049012110###@@@Tours###@@@joshua$0$3###@@@Content###@@@Authors
09-21 15:47:35.570: I/System.out(4095): Position: 3
09-21 15:47:35.570: I/System.out(4095): joshua's tour$0$3###@@@Content###@@@joshua's_tour-1408968854379###@@@Tours###@@@joshua$0$3###@@@Content###@@@Authors
我试图在onCreate（）中对这些代码中的所有代码进行注释：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getActionBar().setTitle("");
getActionBar().hide();
setContentView(R.layout.activity_search);
ListView resultiew = (ListView) findViewById(R.id.result_list);
ArrayList<String> results = new ArrayList<String>();
this.myadp = new myAdapter(this, android.R.layout.simple_list_item_1, results);
resultiew.setAdapter(myadp);
results.add("hello");
}
我得到了这个logCat输出：
09-21 16:26:42.490: I/System.out(8084): Position: 0
09-21 16:26:42.490: I/System.out(8084): hello
09-21 16:26:42.490: I/System.out(8084): 1
09-21 16:26:42.530: I/System.out(8084): Position: 0
09-21 16:26:42.530: I/System.out(8084): hello
09-21 16:26:42.530: I/System.out(8084): 1
09-21 16:26:42.560: I/System.out(8084): Position: 0
09-21 16:26:42.560: I/System.out(8084): hello
09-21 16:26:42.560: I/System.out(8084): 1
答案 0 :(得分：-1)
设置适配器时，将绘制数据。再次使用notyfyDataSetChanged（）。