关于android在thread中关闭dialog的错误

Question

我用一个Thread去访问远程数据库，在过程中会弹出dialog，请求结束时，在handler里面关闭dialog
多次请求，就会出现闪退。报错如下
02-06 11:23:41.609: W/dalvikvm(22208): threadid=1: thread exiting with uncaught exception (group=0x40c99450)
02-06 11:23:41.609: E/AndroidRuntime(22208): FATAL EXCEPTION: main
02-06 11:23:41.609: E/AndroidRuntime(22208): java.lang.NullPointerException
02-06 11:23:41.609: E/AndroidRuntime(22208): at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:2993)
02-06 11:23:41.609: E/AndroidRuntime(22208): at android.os.Handler.dispatchMessage(Handler.java:99)
02-06 11:23:41.609: E/AndroidRuntime(22208): at android.os.Looper.loop(Looper.java:137)
02-06 11:23:41.609: E/AndroidRuntime(22208): at android.app.ActivityThread.main(ActivityThread.java:4794)
02-06 11:23:41.609: E/AndroidRuntime(22208): at java.lang.reflect.Method.invokeNative(Native Method)
02-06 11:23:41.609: E/AndroidRuntime(22208): at java.lang.reflect.Method.invoke(Method.java:511)
02-06 11:23:41.609: E/AndroidRuntime(22208): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
02-06 11:23:41.609: E/AndroidRuntime(22208): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
02-06 11:23:41.609: E/AndroidRuntime(22208): at dalvik.system.NativeStart.main(Native Method)

这是源码
valuemap.clear();
valuemap.put("action", "/android/receiveLandMaterial.shtml");//线体验证的地址
valuemap.put("lineNo", lineNoValue);
valuemap.put("drawingNo", drawingNoValue);
valuemap.put("materialBarcode", ch.subSequence(0, ch.length()-1));
if(testdialog==null){
testdialog = new ShowDialog().showTestDialog(context, "正在领料当中");
}else{
testdialog.show();
}
editmap.put("szsdialog", testdialog);
editmap.put("szscheckmark", "1");
thread = new Thread(new CommonRun(editmap,valuemap)); //启动线程开始校验4
thread.start();

                                        Message msg = new Message();
    Map<String,Object> resultMap = new CheckTextDAO().checktext(valuemap,editmap);
    Bundle b = new Bundle();
    for(String key : resultMap.keySet()){
        b.putString(key, resultMap.get(key).toString());
    }
    //b.putString("message", (String) resultMap.get("message"));
    msg.setData(b);
    resetHandler.sendMessage(msg);

    Context context = (Context) editmap.get("thisActivity");
                /**
                 * 如果有提示框，让提示框消失
                 */
                if(editmap.get("szsdialog")!=null){
                    AlertDialog testdialog = (AlertDialog) editmap.get("szsdialog");
                    if(testdialog!=null&&testdialog.isShowing()){
                        testdialog.setCancelable(true);
                        testdialog.dismiss();
                    }
                    editmap.remove("szsdialog");
                }

                //接下来给出提示信息
                TextView tishi = (TextView) editmap.get("tishi");
                if(tishi!=null){
                    tishi.setTextColor(android.graphics.Color.RED);
                    tishi.setText(bundle.getString("message"));
                }
                //Toast.makeText(context, bundle.getString("message"), 2000).show();
                /**
                 * 出错了发出声音提示
                 */
                SoundPlayUtils sound = new SoundPlayUtils();
                if(context!=null){
                    sound.init(context);
                    sound.play(1);
                    /**
                     * 如果出错了，给出震动提示
                     */
                    new VibrateHelp().vSimple(context, 500);
                }
                //对字段进行操作
                if(StringX.isEmpty(bundle.getString("check"))){
                    //获取那个字段检验失败
                    EditText thisedite = (EditText) editmap.get(bundle.get("check"));
                    if(thisedite!=null){
                        //清空当前字段
                        thisedite.setText("");
                        thisedite.requestFocus();//焦点的变化
                    }
                }

Answer 1

出现空指针异常了。可以看看出错的时候，是不是有访问空指针了。