我编辑我的代码,根据亲爱的Mayank'answer,但它不显示任何消息,在方法开始之前显示在displayMsg()方法输入..我应该说MethodTest()是以nfc和方法onNewIntent(意向意图)进度对话框不显示在屏幕上
@Override
protected void onNewIntent(Intent intent) {
MethodTest();
..............
}
public void MethodTest() {
DisplayMsg("method 1 is running");
Method1();
DisplayMsg("method 2 is running");
Method2();
DisplayMsg("method 3 is running");
Method3();
}
private int DisplayMsg(String msg) {
totalMsg += msg;
DisplayMsgClass dc = new DisplayMsgClass();
dc.doInBackground(totalMsg);
}
private class DisplayMsgClass extends AsyncTask<String, Integer, String> {
@Override
protected void onPreExecute() {
textView.setText("Hello !!!");
progressBar = (ProgressBar) findViewById(R.id.progressBar1);
progressBar.setVisibility(View.VISIBLE);
super.onPreExecute();
}
@Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
}
@Override
protected String doInBackground(String... Messages) {
return Messages[0];
}
@Override
protected void onPostExecute(String result) {
progressBar.setVisibility(View.INVISIBLE);
textView.setText(result);
}
}
在我的布局
:
<LinearLayout>
<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:id="@+id/progressBar1"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textv1"
android:hint="AppletPass"
android:gravity="center"/>
</LinearLayout>
你是什么意思'int value = obj.doInBackground(msg);'?请参阅[AsyncTask](https://developer.android.com/reference/android/os/AsyncTask.html)以获取正确的AsyncTask实现 –
这并不重要,我把它放在确保DisplayMsg被执行并创建一个时间可以看到对话框 – Fatemeh
好吧,使用'obj.execute(“”);'而不是'int value = obj.doInBackground(msg);'并检查'ProgressDialog'是否显示 –