未捕获的处理程序：线程主因未捕获的异常而退出

Question

我在下面用这种方式开始新的活动

Intent edit = new Intent(getParent(), WebViewLink.class);
TabGroupActivity parentActivity = (TabGroupActivity) getParent();
edit.putExtra(POSITION, FAQ);
parentActivity.startChildActivity("WebViewLink", edit);

我遇到这样的错误

08-19 13:44:49.955: ERROR/AndroidRuntime(548): Uncaught handler: thread main exiting due to uncaught exception
08-19 13:44:49.974: ERROR/AndroidRuntime(548): android.view.WindowManager$BadTokenException: Unable to add window -- token android.app.LocalActivityManager$LocalActivityRecord@44dabdc8 is not valid; is your activity running?
08-19 13:44:49.974: ERROR/AndroidRuntime(548):     at android.view.ViewRoot.setView(ViewRoot.java:468)
08-19 13:44:49.974: ERROR/AndroidRuntime(548):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
08-19 13:44:49.974: ERROR/AndroidRuntime(548):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
08-19 13:44:49.974: ERROR/AndroidRuntime(548):     at android.view.Window$LocalWindowManager.addView(Window.java:424)
08-19 13:44:49.974: ERROR/AndroidRuntime(548):     at android.app.Dialog.show(Dialog.java:239)
08-19 13:44:49.974: ERROR/AndroidRuntime(548):     at com.stress.WebViewLink$2.onLoadResource(WebViewLink.java:73)
08-19 13:44:49.974: ERROR/AndroidRuntime(548):     at android.webkit.CallbackProxy.handleMessage(CallbackProxy.java:355)
08-19 13:44:49.974: ERROR/AndroidRuntime(548):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-19 13:44:49.974: ERROR/AndroidRuntime(548):     at android.os.Looper.loop(Looper.java:123)
08-19 13:44:49.974: ERROR/AndroidRuntime(548):     at android.app.ActivityThread.main(ActivityThread.java:4363)
08-19 13:44:49.974: ERROR/AndroidRuntime(548):     at java.lang.reflect.Method.invokeNative(Native Method)
08-19 13:44:49.974: ERROR/AndroidRuntime(548):     at java.lang.reflect.Method.invoke(Method.java:521)
08-19 13:44:49.974: ERROR/AndroidRuntime(548):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
08-19 13:44:49.974: ERROR/AndroidRuntime(548):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
08-19 13:44:49.974: ERROR/AndroidRuntime(548):     at dalvik.system.NativeStart.main(Native Method)

但是当我用这种方式调用new Activity时没有问题

Intent edit = new Intent(getParent(), WebViewLink.class);
edit.putExtra(POSITION, FAQ);
More.this.startActivity(edit);

你可以在这里看到 My WebViewLink.java 类

public class WebViewLink extends Activity {
public static String POSITION = "position";
int position = 0;
private Button back;
private TextView ttl;
ProgressDialog myProgressDialog = null;
private WebView webView;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.webview);

    webView = (WebView) findViewById(R.id.webview);
    back = (Button) findViewById(R.id.backtomore);
    ttl = (TextView) findViewById(R.id.my_title);
    webView.getSettings().setJavaScriptEnabled(true);
    if (getIntent().getExtras() != null) {
        if (getIntent().getExtras().containsKey(POSITION)) {
            position = getIntent().getExtras().getInt(POSITION);
        }
    }
    switch (position) {
    case More.FAQ:
        ttl.setText("FAQ");
        setWebLink();
        webView.loadUrl("file:///android_asset/faq4.htm");
        break;
    case More.ABOUT_US:
        ttl.setText("About Us");
        setWebLink();
        webView.loadUrl("file:///android_asset/Advice/About Us.html");
        break;
    case More.DISCLAIMMER:
        ttl.setText("Disclaimer");
        setWebLink();
        webView.loadUrl("file:///android_asset/Advice/Disclaimer.html");
        break;
    }
    back.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            finish();
        }
    });
}

private void setWebLink() {
    webView.setWebViewClient(new WebViewClient() {
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
            return true;
        }
        public void onLoadResource(WebView view, String url) {
            if (myProgressDialog == null) {
                myProgressDialog = new ProgressDialog(WebViewLink.this);
                myProgressDialog.setMessage("Loading.... Please Wait");
                myProgressDialog.show();
            }
        }
        public void onPageFinished(WebView view, String url) {
            if (myProgressDialog.isShowing()) {
                myProgressDialog.dismiss();
            }
        }
    });
}

}

Answer 1

问题出在这行代码中：

myProgressDialog = new ProgressDialog(WebViewLink.this);

当你是 TabGroupActivity 时，孩子 Activity(ies) 需要父母的 Context 来添加新的窗口、对话框。试试这个方法：

myProgressDialog = new ProgressDialog(WebViewLink.this.getParent());

并对所有Dialogs 执行相同操作。

Answer 2

08-19 13:44:49.974: ERROR/AndroidRuntime(548): android.view.WindowManager$BadTokenException: Unable to add window -- token android.app.LocalActivityManager$LocalActivityRecord@44dabdc8 is not valid; is your activity running?

上述错误表明您的活动没有运行。因此，当您使用以下说明调用此活动时，程序会崩溃。因为它无法获得任何活动。

TabGroupActivity parentActivity = (TabGroupActivity) getParent();