java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread.
是不是你在用 adapter.notifyDataSetChanged() 刷新listview的时候，如果当前listview还未来得及刷新，你就去触摸listview，就会导致跳出出错信息呢？
解决办法是，通过设置listview.setVisibility(View.VISIBLE/View.GONE)。
在 adapter.notifyDataSetChanged() 之前调用listview.setVisibility(View.GONE)；在adapter.notifyDataSetChanged() 之后调用listview.setVisibility(View.VISIBLE)
public class ListViewStressTest extends ListActivity {
ArrayAdapter<String> adapter;
ListView list;
AsyncTask<Void, String, Void> task;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
this.list = this.getListView();
this.list.setAdapter(this.adapter);
this.task = new AsyncTask<Void, String, Void>() {
Random r = new Random();
int[] delete;
volatile boolean scroll = false;
@Override
protected void onProgressUpdate(String... values) {
if(scroll) {
scroll = false;
doScroll();
return;
}
if(values == null) {
doDelete();
return;
}
doUpdate(values);
if(ListViewStressTest.this.adapter.getCount() > 5000) {
ListViewStressTest.this.adapter.clear();
}
}
private void doScroll() {
if(ListViewStressTest.this.adapter.getCount() == 0) {
return;
}
int n = r.nextInt(ListViewStressTest.this.adapter.getCount());
ListViewStressTest.this.list.setSelection(n);
}
private void doDelete() {
int[] d;
synchronized(this) {
d = this.delete;
}
if(d == null) {
return;
}
for(int i = 0 ; i < d.length ; i++) {
int index = d[i];
if(index >= 0 && index < ListViewStressTest.this.adapter.getCount()) {
ListViewStressTest.this.adapter.remove(ListViewStressTest.this.adapter.getItem(index));
}
}
}
private void doUpdate(String... values) {
for(int i = 0 ; i < values.length ; i++) {
ListViewStressTest.this.adapter.add(values[i]);
}
}
private void updateList() {
int number = r.nextInt(30) + 1;
String[] strings = new String[number];
for(int i = 0 ; i < number ; i++) {
strings[i] = Long.toString(r.nextLong());
}
this.publishProgress(strings);
}
private void deleteFromList() {
int number = r.nextInt(20) + 1;
int[] toDelete = new int[number];
for(int i = 0 ; i < number ; i++) {
int num = ListViewStressTest.this.adapter.getCount();
if(num < 2) {
break;
}
toDelete[i] = r.nextInt(num);
}
synchronized(this) {
this.delete = toDelete;
}
this.publishProgress(null);
}
private void scrollSomewhere() {
this.scroll = true;
this.publishProgress(null);
}
@Override
protected Void doInBackground(Void... params) {
while(true) {
int what = r.nextInt(3);
switch(what) {
case 0:
updateList();
break;
case 1:
deleteFromList();
break;
case 2:
scrollSomewhere();
break;
}
try {
Thread.sleep(0);
} catch(InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
};
this.task.execute(null);
}
}
