启动第二个意图&从主活动中查看并使用线程显示 ProgressDialog
我在显示 ProgressDialog 时遇到一些问题。我有一种从网站上抓取信息的方法，我想向用户显示某种“正在加载”窗口，而不是应用程序在工作时看起来挂起一两秒钟。
当我不实现 ProgressDialog & 时，一切正常。线程，但是当我尝试实现线程来完成繁重的工作时，“关于我”视图窗口是空的。
我有一个带有注册 OnClickListener 的 TextView 的 MainActivity。
单击 TextView 会执行以下操作：
startActivity(new Intent(getBaseContext(), AboutMe.class));
这是 AboutMe.class 活动的大部分内容：
public class AboutMe extends Activity {
private ProgressDialog aboutMeProgressDialog;
private String htmlAboutMe = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
getAboutMe(); // Get information from Internet
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFeatureDrawableResource(Window.FEATURE_NO_TITLE, android.R.drawable.ic_dialog_alert);
setContentView(R.layout.abutme);
TextView tvAbout = (TextView) findViewById(R.id.aboutMe);
tvAbout.setText(Html.fromHtml(htmlAboutMe));
}
private void getAboutMe() {
try {
aboutMeProgressDialog = ProgressDialog.show(AboutMe.this, "", "Loading");
new Thread() {
@Override
public void run() {
try {
/** Code to scape webpage **/
}
catch (Exception exp) {
exp.printStackTrace();
}
handler.sendEmptyMessage(0);
}
}.start();
}
catch (Exception ex) {
ex.printStackTrace();
}
}
private final Handler handler = new Handler() {
@Override
public void handleMessage(final Message msg) {
aboutMeProgressDialog.dismiss();
}
};
我显然错过了一些琐碎的事情，但我已经尝试 Google 搜索我能想到的所有内容，但仍然找不到与 ProgressDialog 一起为我工作。
I'm having some problems displaying a ProgressDialog. I have a method that scrapes information from a website, and I want to show the user some kind of "Loading" window instead of the app just looking like it is hanging for a second or two when it is working.
Everything works fine when I don't implement a ProgressDialog & Thread, but as soon as I try to implement a Thread to do the heavy lifting, the AboutMe View window is empty.
I have a MainActivity with a TextView that registers a OnClickListener.
A Click on the TextView does a:
startActivity(new Intent(getBaseContext(), AboutMe.class));
This is most of the AboutMe.class Activity:
public class AboutMe extends Activity {
private ProgressDialog aboutMeProgressDialog;
private String htmlAboutMe = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
getAboutMe(); // Get information from Internet
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFeatureDrawableResource(Window.FEATURE_NO_TITLE, android.R.drawable.ic_dialog_alert);
setContentView(R.layout.abutme);
TextView tvAbout = (TextView) findViewById(R.id.aboutMe);
tvAbout.setText(Html.fromHtml(htmlAboutMe));
}
private void getAboutMe() {
try {
aboutMeProgressDialog = ProgressDialog.show(AboutMe.this, "", "Loading");
new Thread() {
@Override
public void run() {
try {
/** Code to scape webpage **/
}
catch (Exception exp) {
exp.printStackTrace();
}
handler.sendEmptyMessage(0);
}
}.start();
}
catch (Exception ex) {
ex.printStackTrace();
}
}
private final Handler handler = new Handler() {
@Override
public void handleMessage(final Message msg) {
aboutMeProgressDialog.dismiss();
}
};
I'm clearly missing out on something trivial, but I've tried to Google just about everything I can think of, but still can't get a Thread together with ProgressDialog to work for me.
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评论（2）
请使用 run on ui thread 方法
而不是 handler.sendEmptyMessage(0);使用此代码并删除处理消息
伙计让我知道这是否成功，大多数时候它都有效
please use run on ui thread method
instead of handler.sendEmptyMessage(0); use this code and remove handle message
dude let me know if this was successful,it works most of times
请在调用 super.onCreate(savedInstanceState) 后调用 getAboutMe() 方法；
please call getAboutMe() method after calling super.onCreate(savedInstanceState);