小编ahe*_*ann的帖子

我的某个应用的用户报告了此错误.我很困惑如何修复它意味着什么.经过一番谷歌搜索......仍然没有运气.以前见过这个或者知道如何解决它的人？

java.lang.IllegalArgumentException: The observer is null.
at android.database.Observable.unregisterObserver(Observable.java:59)
at android.widget.BaseAdapter.unregisterDataSetObserver(BaseAdapter.java:42)
at android.widget.HeaderViewListAdapter.unregisterDataSetObserver(HeaderViewListAdapter.java:256)
at android.widget.AbsListView.onDetachedFromWindow(AbsListView.java:2309)
at android.view.View.dispatchDetachedFromWindow(View.java:8197)
at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1968)
at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1966)
at android.view.ViewGroup.removeViewInternal(ViewGroup.java:3257)
at android.view.ViewGroup.removeViewInternal(ViewGroup.java:3237)
at android.view.ViewGroup.removeView(ViewGroup.java:3185)
at com.aheudev.a.slickdeals.adapters.DealPageAdapter.destroyItem(DealPageAdapter.java:174)
at android.support.v4.view.ViewPager.populate(ViewPager.java:415)
at android.support.v4.view.ViewPager.completeScroll(ViewPager.java:696)
at android.support.v4.view.ViewPager.computeScroll(ViewPager.java:668)
at android.view.ViewGroup.drawChild(ViewGroup.java:2434)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2189)
at android.view.View.draw(View.java:9282)
at android.view.ViewGroup.drawChild(ViewGroup.java:2584)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2189)
at android.view.ViewGroup.drawChild(ViewGroup.java:2582)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2189)
at android.view.ViewGroup.drawChild(ViewGroup.java:2582)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2189)
at android.view.View.draw(View.java:9282)
at android.widget.FrameLayout.draw(FrameLayout.java:419)
at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1923)
at android.view.ViewRoot.draw(ViewRoot.java:1695)
at android.view.ViewRoot.performTraversals(ViewRoot.java:1410)
at android.view.ViewRoot.handleMessage(ViewRoot.java:2040)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:132)
at android.app.ActivityThread.main(ActivityThread.java:4123)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:491)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
at …

所以,我有下面的grunt文件.我想添加一个任务,它将启动我的节点应用程序并监视目录中的更改并重新启动.我一直在使用supervisor,node-dev(这很棒)但我想运行一个命令并启动我的整个应用程序.必须有一个简单的方法来做到这一点,但我只是想念它.它也用coffeescript编写(不确定是否会改变)...

module.exports = function(grunt) {
  grunt.initConfig({
    /*exec: {
        startApi: {
            command: "npm run-script start-api"
        }
    },*/
    //static server
    server: {
        port: 3333,
        base: './public',
        keepalive: true
    },

    // Coffee to JS compilation
    coffee: {
        compile: {
            files: {
                './public/js/*.js': './src/client/app/**/*.coffee'
            },
            options: {
                //basePath: 'app/scripts'
            }
        }
    },


    mochaTest: {
        all: ['test/**/*.*']
    },


    watch: {
        coffee: {
            files: './src/client/app/**/*.coffee',
            tasks: 'coffee'
        },
        mochaTest: {
            files: 'test/**/*.*',
            tasks: 'mochaTest'
        }
    }
});

grunt.loadNpmTasks('grunt-contrib-coffee');
grunt.loadNpmTasks('grunt-mocha-test');
//grunt.loadNpmTasks('grunt-exec');

grunt.registerTask( 'default', 'server coffee mochaTest watch' …