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为什么在代码中声明时它会立即崩溃并说“ x 保持停止” BufferedReader？

这是现在的代码（不是全部）：

web.setWebViewClient(new WebViewClient() {
 public void onPageFinished(WebView view, String url) {
  web.getSettings().setDomStorageEnabled(true);
  web.loadUrl("javascript: {" + 
           "document.getElementsByName('authid')[0].value = '" + ID + "';" +
           "document.getElementsByName('authpw')[0].value = '" + PASS 
           + "';" + "var submit = document.getElementsByClassName('inputbutton');" 
           + "submit[0].click(); };");
 }
});
try {
 BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
} catch (IOException e) {
 e.printStackTrace();
}

从 LogCat：

E/AndroidRuntime: FATAL EXCEPTION: main
              Process: de.kurt.vertretungsplan, PID: 4525
              java.lang.RuntimeException: Unable to start activity ComponentInfo{de.kurt.vertretungsplan/de.kurt.vertretungsplan.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.io.InputStream java.net.URL.openStream()' on a null object reference
                  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
                  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
                  at android.app.ActivityThread.-wrap12(ActivityThread.java)
                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
                  at android.os.Handler.dispatchMessage(Handler.java:102)
                  at android.os.Looper.loop(Looper.java:154)
                  at android.app.ActivityThread.main(ActivityThread.java:6119)
                  at java.lang.reflect.Method.invoke(Native Method)
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
               Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.io.InputStream java.net.URL.openStream()' on a null object reference
                  at de.kurt.vertretungsplan.MainActivity.onCreate(MainActivity.java:89)
                  at android.app.Activity.performCreate(Activity.java:6679)
                  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
                  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
                  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) 
                  at android.app.ActivityThread.-wrap12(ActivityThread.java) 
                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477) 
                  at android.os.Handler.dispatchMessage(Handler.java:102) 
                  at android.os.Looper.loop(Looper.java:154) 
                  at android.app.ActivityThread.main(ActivityThread.java:6119) 
                  at java.lang.reflect.Method.invoke(Native Method) 
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) E/libEGL: validate_display:99 error 3008 (EGL_BAD_DISPLAY)

你在哪里看到问题？

4

0 回答 0