[英]How to transfer the value of the string from thread to another?
我正在使用Jsoup解析網站的一部分,然后將其放入字符串中。 我想將此字符串可視化為textView,但是由於只有創建了textView的線程才能修改它,因此我需要將字符串的值傳遞到主線程中。 怎么樣?
這是代碼:(忽略tabhost的內容)
public class NewsAndAnnouncements extends Activity {
TabHost host;
FlyOutContainer container;
Button bttoggle;
Button bt1;
String loggity;
TextView tv1;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
this.container = (FlyOutContainer) this.getLayoutInflater().inflate(
R.layout.newsandannouncements, null);
this.setContentView(container);
host = (TabHost) findViewById(R.id.tabhost);
host.setup();
TabSpec specs = host.newTabSpec("TAGGITY EINZ");
specs.setContent(R.id.tab1);
specs.setIndicator("News");
host.addTab(specs);
specs = host.newTabSpec("TAGGITY ZWEI");
specs.setContent(R.id.tab2);
specs.setIndicator("Notices");
host.addTab(specs);
specs = host.newTabSpec("TAGGITY DREI");
specs.setContent(R.id.tab3);
specs.setIndicator("Events");
host.addTab(specs);
tv1 = (TextView) findViewById(R.id.textView1);
/*
* bttoggle = (Button) findViewById(R.id.bttoggle); bt1 = (Button)
* findViewById(R.id.Button1);
*
* bttoggle.setOnClickListener(new OnClickListener() {
*
* @Override public void onClick(View v) { // TODO Auto-generated method
* container.toggleMenu(); } });
*
* bt1.setOnClickListener(new OnClickListener() {
*
* @Override public void onClick(View v) { // TODO Auto-generated method
* container.toggleMenu(); } });
*/
Thread newsThread = new Thread() {
public void run() {
Document doc = null;
try {
doc = Jsoup
.connect(
"http://acs.bg/Home/About_ACS/News_and_Events/News.aspx")
.get();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Elements myin = doc.getElementsByClass("news_list");
loggity = myin.toString();
Log.i("ELEMENTS HTML", loggity);
}
};
newsThread.start();
tv1.setText(loggity);
}
}
嘗試使用AsyncTask而不是Thread。 要在ui線程上修改視圖,請在活動中使用runOnUiThread()方法。
runOnUiThread(new Runnable() {
@Override
public void run() {
tv1.setText("...");
}
});
使用AsyncTask而不是原始線程:
new AsyncTask<URL, Object, Document>() {
protected Document doInBackground(URL... urls) {
// parse URL and return document
}
protected void onPostExecute(Document result) {
// this runs in UI thread
// show document in UI
}
}).execute(myURL);
有兩種方法可以做到-
1)-使用AsyncTask
2)-使用處理程序
Thread newsThread = new Thread()
{
public void run()
{
Document doc = null;
try {
doc = Jsoup
.connect(
"http://acs.bg/Home/About_ACS/News_and_Events/News.aspx")
.get();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
Elements myin = doc.getElementsByClass("news_list");
loggity = myin.toString();
mHandler.post(new Runnable()
{
@Override
public void run()
{
try
{
tv1.setText(loggity);
} catch (Exception e)
{
e.printStackTrace();
}
}
});
Log.i("ELEMENTS HTML", loggity);
}
};
newsThread.start();
您可以在開始時初始化Hanlder。
試試下面的示例代碼,不知道這是否是更好的方法:
public class MainThread {
public static void main(String args[]) {
Thread2 t2 = new Thread2();
Thread nextThread = new Thread(t2);
nextThread.start();
try {
nextThread.join();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println();
System.out.println(t2.getStr());
}
private static class Thread2 implements Runnable{
private String str;
@Override
public void run() {
setStr("T2 Thread String");
}
public String getStr() {
return str;
}
public void setStr(String str) {
this.str = str;
}
}
}
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