I am trying to show a spinning progress while I load some data, but it isn't showing until after the data is loaded?
我正在尝试在加载一些数据时显示旋转进度，但直到数据加载后才显示？
Here is how I am trying to do this:
以下是我尝试这样做的方法：
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.screen1);
//Show spinner while data is being loaded
ProgressDialog dialog = ProgressDialog.show(this, "", "Loading. Please wait...", true);
LoadPreferences();
LoadData();
//Remove the spinner once all the data has been loaded
dialog.dismiss();
}
What am I doing wrong?
我究竟做错了什么？
Updated code:
更新的代码：
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.screen1);
//Show spinner while data is being loaded
final ProgressDialog dialog = ProgressDialog.show(this, "", "Loading. Please wait...", true);
// define and run background thread
Thread backgroundThread = new Thread(new Runnable()
{
public void run()
{
// keep sure that this operations
// are thread-safe!
Looper.prepare(); //I had to include this to prevent force close error
LoadPreferences();
LoadData();
runOnUiThread(new Runnable()
{
public void run()
{
dialog.dismiss();
}
});
}
});
backgroundThread.start();
}
This now loads the app and shows the spinner. But my LoadData() function is crashing it when trying to update the UI:
现在加载应用程序并显示微调器。但是我的LoadData（）函数在尝试更新UI时崩溃了：
12-27 21:58:12.575: ERROR/AndroidRuntime(357): Uncaught handler: thread Thread-8 exiting due to uncaught exception
12-27 21:58:12.575: ERROR/AndroidRuntime(357): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.view.ViewRoot.checkThread(ViewRoot.java:2683)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.view.ViewRoot.requestLayout(ViewRoot.java:557)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.view.View.requestLayout(View.java:7918)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.view.View.requestLayout(View.java:7918)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.view.View.requestLayout(View.java:7918)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.view.View.requestLayout(View.java:7918)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.view.View.requestLayout(View.java:7918)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.view.View.requestLayout(View.java:7918)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.view.View.requestLayout(View.java:7918)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.widget.TableLayout.requestLayout(TableLayout.java:223)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.view.View.requestLayout(View.java:7918)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.widget.ScrollView.requestLayout(ScrollView.java:1103)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.view.View.requestLayout(View.java:7918)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.view.View.requestLayout(View.java:7918)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.view.View.requestLayout(View.java:7918)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.widget.TextView.checkForRelayout(TextView.java:5373)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.widget.TextView.setText(TextView.java:2684)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.widget.TextView.setText(TextView.java:2552)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at android.widget.TextView.setText(TextView.java:2527)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at com.bebetech.helloWorld.helloWorld.UpdateGUI(helloWorld.java:346)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at com.bebetech.helloWorld.helloWorld.LoadData(helloWorld.java:191)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at com.bebetech.helloWorld.helloWorld.$1.run(helloWorld.java:106)
12-27 21:58:12.575: ERROR/AndroidRuntime(357): at java.lang.Thread.run(Thread.java:1096)
3 个解决方案
#1
5
Yes, Mitch Wheat is absolutely correct.
是的，Mitch Wheat绝对正确。
Heres what you have to edit:
下面你要编辑的内容：
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//Show spinner while data is being loaded
final ProgressDialog dialog = ProgressDialog.show(this, "", "Loading. Please wait...", true);
Thread thread=new Thread(new Runnable(){
public void run(){
LoadPreferences();
LoadData();
runOnUiThread(new Runnable(){
@Override
public void run() {
if(dialog.isShowing())
dialog.dismiss();
}
});
}
});
thread.start();
}
#2
3
You should load the data in a background thread:
您应该在后台线程中加载数据：
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
final View screen1 = this.findViewById(R.id.screen1);
this.setContentView(screen1);
//Show spinner while data is being loaded
final ProgressDialog dialog = ProgressDialog.show(this, "", "Loading. Please wait...", true);
// define and run background thread
Thread backgroundThread = new Thread(new Runnable() {
@Override
public void run() {
// keep sure that this operations
// are thread-safe!
LoadPreferences();
LoadData();
runOnUiThread(new Runnable() {
@Override
public void run() {
dialog.dismiss();
}
})
}
});
backgroundThread.start();
}
#3
1
I believe you miss this code line, it should be placed just BEFORE the call to setConetntView:
我相信你错过了这个代码行，它应该在调用setConetntView之前放置：
onCreate(){
....
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
this.setContentView(screen1);
....
}
#1
5
Yes, Mitch Wheat is absolutely correct.
是的，Mitch Wheat绝对正确。
Heres what you have to edit:
下面你要编辑的内容：
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//Show spinner while data is being loaded
final ProgressDialog dialog = ProgressDialog.show(this, "", "Loading. Please wait...", true);
Thread thread=new Thread(new Runnable(){
public void run(){
LoadPreferences();
LoadData();
runOnUiThread(new Runnable(){
@Override
public void run() {
if(dialog.isShowing())
dialog.dismiss();
}
});
}
});
thread.start();
}
#2
3
You should load the data in a background thread:
您应该在后台线程中加载数据：
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
final View screen1 = this.findViewById(R.id.screen1);
this.setContentView(screen1);
//Show spinner while data is being loaded
final ProgressDialog dialog = ProgressDialog.show(this, "", "Loading. Please wait...", true);
// define and run background thread
Thread backgroundThread = new Thread(new Runnable() {
@Override
public void run() {
// keep sure that this operations
// are thread-safe!
LoadPreferences();
LoadData();
runOnUiThread(new Runnable() {
@Override
public void run() {
dialog.dismiss();
}
})
}
});
backgroundThread.start();
}
#3
1
I believe you miss this code line, it should be placed just BEFORE the call to setConetntView:
我相信你错过了这个代码行，它应该在调用setConetntView之前放置：
onCreate(){
....
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
this.setContentView(screen1);
....
}