我创建了一个使用twitter 4j的应用程序我试图在不同的线程上运行以使其更快但我得到了错误
08-03 16:02:02.138: E/AndroidRuntime(439): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
08-03 16:02:02.138: E/AndroidRuntime(439): at android.view.ViewRoot.checkThread(ViewRoot.java:2802)
08-03 16:02:02.138: E/AndroidRuntime(439): at android.view.ViewRoot.invalidateChild(ViewRoot.java:607)
08-03 16:02:02.138: E/AndroidRuntime(439): at android.view.ViewRoot.invalidateChildInParent(ViewRoot.java:633)
08-03 16:02:02.138: E/AndroidRuntime(439): at android.view.ViewGroup.invalidateChild(ViewGroup.java:2505)
08-03 16:02:02.138: E/AndroidRuntime(439): at android.view.View.invalidate(View.java:5139)
08-03 16:02:02.138: E/AndroidRuntime(439): at android.widget.AbsListView.resetList(AbsListView.java:1011)
08-03 16:02:02.138: E/AndroidRuntime(439): at android.widget.ListView.resetList(ListView.java:493)
08-03 16:02:02.138: E/AndroidRuntime(439): at android.widget.ListView.setAdapter(ListView.java:422)
08-03 16:02:02.138: E/AndroidRuntime(439): at android.app.ListActivity.setListAdapter(ListActivity.java:267)
08-03 16:02:02.138: E/AndroidRuntime(439): at a.a.a.StatusListActivity.loadHomeTimeline(StatusListActivity.java:91)
08-03 16:02:02.138: E/AndroidRuntime(439): at a.a.a.StatusListActivity.access$0(StatusListActivity.java:84)
08-03 16:02:02.138: E/AndroidRuntime(439): at a.a.a.StatusListActivity$2.run(StatusListActivity.java:78)
这是我的代码
public class StatusListActivity extends ListActivity{
private Otweet app;
private Twitter twitter;
private OAuthHelper authhelper;
private LoadMoreListItem headerView;
private LoadMoreListItem FooterView;
private StatusListAdapter adapter;
protected ProgressDialog progressdialog;
private Handler handler=new Handler();
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
app=(Otweet)getApplication();
twitter=app.gettwitter();
System.setProperty("twitter4j.http.useSSL","false");
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.main);
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
if(!app.isAuthorized())
{
beginAuthorization();
}
else
{
if(null==getListAdapter())
loadHomeTimelineifnotloaded();
}
}
public void beginAuthorization()
{
Intent intent=new Intent(StatusListActivity.this,AuthorizationActivity.class);
startActivity(intent);
}
private void loadHomeTimelineifnotloaded() {
// TODO Auto-generated method stub
// progressdialog=ProgressDialog.show(StatusListActivity.this,"Load home timeline","loading");
Thread LoadHomeTimeline=new Thread(){
public void run()
{
loadHomeTimeline();
handler.post(FinishedLoadingTasks);
}
};
LoadHomeTimeline.start();
}
private void loadHomeTimeline()
{
try {
ArrayList<Status> status=twitter.getHomeTimeline();
adapter=new StatusListAdapter(this, status);
setListAdapter(adapter);
setloadMoreViews();
setListAdapter(adapter);
getListView().setSelection(1);
} catch (TwitterException e) {
// TODO Auto-genera ted catch block
e.printStackTrace();
Toast.makeText(getApplicationContext(), "jj", Toast.LENGTH_SHORT).show();
}
}
private Runnable FinishedLoadingTasks=new Runnable() {
public void run() {
// TODO Auto-generated method stub
finishedLoadinglist();
}
};
public void finishedLoadinglist()
{
setloadMoreViews();
setListAdapter(adapter);
getListView().setSelection(1);
// progressdialog.dismiss();
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
if(v.equals(headerView))
{
headerView.showProgress();
try {
headerView.showProgress();
loadnewerTweets();
} catch (TwitterException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else if
(v.equals(FooterView))
{
FooterView.showProgress();
try {
LoadOlderTweets();
} catch (TwitterException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private void LoadOlderTweets() throws TwitterException {
// TODO Auto-generated method stub
FooterView.hideProgress();
ArrayList<Status> statii=twitter.getHomeTimeline(new Paging().maxId(adapter.getLastId()));
adapter.appendOlder(statii);
}
private void loadnewerTweets() throws TwitterException {
// TODO Auto-generated method stub
//try {
headerView.showProgress();
setProgressBarIndeterminateVisibility(true);
Thread loadMoreThread=new Thread()
{
public void run()
{
try {
ArrayList<Status> statii = twitter.getHomeTimeline(new Paging().sinceId(adapter.getFirstId()));
Runnable finishedLoadingNewerTask=new LoadNewerResults(statii);
handler.post(finishedLoadingNewerTask);
} catch (TwitterException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
// }
// catch (TwitterException e) {
// TODO Auto-generated catch block
// throw new RuntimeException("Unable to load home timeline",e);
// }
}
protected void finishedLoadingNewer(ArrayList<Status> statii)
{
adapter.appendNewer(statii);
headerView.hideProgress();
setProgressBarIndeterminateVisibility(false);
getListView().setSelection(1);
}
private class LoadNewerResults implements Runnable
{
private ArrayList<Status> statii;
public LoadNewerResults(ArrayList<Status> statii)
{
super();
this.statii=statii;
}
public void run() {
// TODO Auto-generated method stub
finishedLoadingNewer(statii);
}
}
private void setloadMoreViews() {
// TODO Auto-generated method stub
headerView=(LoadMoreListItem)getLayoutInflater().inflate(R.layout.load_more, null);
headerView.showHeaderText();
FooterView=(LoadMoreListItem)getLayoutInflater().inflate(R.layout.load_more,null);
FooterView.showFooterText();
getListView().addHeaderView(headerView);
getListView().addFooterView(FooterView);
}
}
我已经搜索了这些错误，我发现我必须在主线程上运行一些东西。有人修理它并向我解释一下吗？非常感谢
答案 0 :(得分：1)
所有Ui操作都需要在UI线程上完成，因此从其他线程可以调用runonUithread来更新其他线程中的Ui元素。 但在您的情况下，我认为您最好使用Asynctask并更新Onprogressupdate和OnpostExecute中的Ui元素。
答案 1 :(得分：0)
您需要在UI线程上更新loadHomeTimeline中的状态列表。查看Activity.runOnUIThread