AsyncTask 和 setContentView
我有这个代码用于管理数据库中的某些国家/地区；
class checkCountryAsync extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
setContentView(R.layout.main);
}
@Override
protected String doInBackground(String... aurl) {
MDPIActivity.this.runOnUiThread(new Runnable() {
public void run() {
CountryTable country = new CountryTable() ;
country.EnterCountry();
}
});
return null;
}
}
有了这个，我想设置内容视图，然后在后台，方法 onBackground 起作用，但我仍然需要等待内容视图，直到 onBackground 方法未完成。
谢谢。
I have this code for managing some countrys on my database;
class checkCountryAsync extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
setContentView(R.layout.main);
}
@Override
protected String doInBackground(String... aurl) {
MDPIActivity.this.runOnUiThread(new Runnable() {
public void run() {
CountryTable country = new CountryTable() ;
country.EnterCountry();
}
});
return null;
}
}
With this, I would like to set the content View and then in background, that the method onBackground works, but I have still to wait for the content view until the onBackground method is not finished.
Thank you.
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评论（3）
我不认为有任何理由将
setContentView()放在onPreExecute方法中，它应该放在onCreate方法中以避免任何类型当您尝试查找视图时，会发生NullPointerException，对于您的AsyncTask，您应该只使用在方法doInBackground()i don't see any reason for putting the
setContentView()in theonPreExecutemethod, it should be in theonCreatemethod to avoid any kind ofNullPointerExceptionwhen you will try to find your views, and for yourAsyncTask, you should just use theonPostExecute()which is executed after the methoddoInBackground()请尝试一下这个，想想它的工作原理。`class checkCountryAsync extends AsyncTask {
}
`
Please try this one, think its work.`class checkCountryAsync extends AsyncTask {
}
`
您应该尝试publishProgress() 和onProgressUpdate() 方法。
You should try publishProgress() and onProgressUpdate() methods.