Java 为什么我的应用程序在启动时崩溃?
我无法将webview应用程序中的进度条更改为circle。该应用程序在启动时崩溃。下面是代码Java 为什么我的应用程序在启动时崩溃?,java,android,android-webview,android-progressbar,Java,Android,Android Webview,Android Progressbar,我无法将webview应用程序中的进度条更改为circle。该应用程序在启动时崩溃。下面是代码 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); webview = (WebView) findViewById(R.id.webvi
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
webview = (WebView) findViewById(R.id.webview);
WebSettings websettings = webview.getSettings();
websettings.setJavaScriptEnabled(true);
getWindow().requestFeature(Window.FEATURE_INDETERMINATE_PROGRESS); // Request progress circle
setProgressBarIndeterminateVisibility(true); // Show progress circle
// webview.setWebViewClient(new WebViewClient());
final Activity activity = this;
webview.setWebChromeClient(new WebChromeClient(){
public void onProgressChanged(WebView view, int progress) {
activity.setTitle("Loading...");
activity.setProgress(progress * 100);
if(progress == 100)
setProgressBarIndeterminateVisibility(false); // Hide progress circle when page loaded
activity.setTitle("Title");
}
});
if (savedInstanceState == null)
{
webview.loadUrl("http://www.proboards.com/");
}
}
有人可以帮忙吗?我发现您的代码中有一些缺陷
As far as I know, the ProgressBar value should be less than or equal to 100.
You are setting it to (progress * 100)
Also, once progress == 100, you hide the progress bar,
this will take place when progress = 1. Then you hide the progress bar.
private ProgressBar mProgress;
private int mProgressStatus = 0;
mProgress = (ProgressBar) findViewById(R.id.progress_bar);
// Start lengthy operation in a background thread
new Thread(new Runnable() {
public void run() {
while (mProgressStatus < 100) {
mProgressStatus = doWork();
// Update the progress bar
mHandler.post(new Runnable() {
public void run() {
mProgress.setProgress(mProgressStatus);
}
});
}
}
}).start();
private ProgressBar进程;
private int mProgressStatus=0;
mProgress=(ProgressBar)findviewbyd(R.id.progress\u bar);
//在后台线程中启动冗长的操作
新线程(newrunnable()){
公开募捐{
而(mProgressStatus<100){
mProgressStatus=doWork();
//更新进度条
mHandler.post(新Runnable(){
公开募捐{
mProgress.setProgress(mProgressStatus);
}
});
}
}
}).start();
您的应用程序崩溃,因为这行代码:
Activity.getWindow().requestFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
在调用Activity.setContentView(…)之前需要调用代码>
您之前正在调用setContentView(…),这就是您的应用程序崩溃的原因。
以下是Android开发者页面的原因:
我已经为你附上了链接。只要把代码通读一遍就行了。