江苏开放大学Android基础--2次形考作业答案.docx

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1、作业说明：1 .做作业之前首先在封面填上自己的学号和姓名，做完作业后请写上作业完成时间。2 .学习完第4-6单元之后必须完本钱次作业，并请在规定时间内通过学习平台提交Word文档形式的电子作业，本次作业占形成性考核总成绩的20%o作业内容：请将学习单元4、5、6中实验局部的工程中程序文件（.java文件，不包括资源文 件.xml）源码贴在以下位置，格式为先写文件名后贴代码，如下：1 MainActivity.javapackage import单元4on Attach。回调方法Public static class FragmentA extends ListFragmentOnArticle

2、sSelectedListener listener; OverridePublic void onAttach(Context context)super.onAttach(context);tryListener=(OnArticlesSelectedListener)context; catch(ClassCastException e)thrownew ClassCastExceptiocontext.toStringO+must implementOnArticleSelectedListener,r);) )通过调用onArticleSelected。与Activity共享事件:

3、public static class FragmentA extends ListFragmentOnArticleSelectedListener listener; Overridepublic void onListItemClick(ListView l,View v, int position,long id)/Append the clicked items row ID with the content provider UriUri noteUri=ContentUris.withAppendedId(ArticleColumns.CONTENT_URI,id);/Send

4、the event and Uri to the host activity Listener.onArticleSelected(noteUri);) )单元5广播接收器记录并显示广播内容public class MyBroadcastReceiver extends BroadcastReceiverprivate static final String TAG=MyBroadcastReceiver;Overridepublic void onReceive(Context context,Intent intent)StringBuilder sb=new StringBuilder(

5、);sb.append(Action:+intent.getAction()+n);sb.append(URI:+iment.toUri(Inten.URINTENT_SCHEME).toString()+n);String log=sb.toString();Log.d(TAQlog);Toast.makeText(context,log,Toast.LENGTH_LONG).show();)适用于后台线程public class MyBroadcastReceiver extends BroadcastReceiverprivate static final String TAG=MyBr

6、oadcastReceiver;Overridepublic void onReceive(Context context,Intent intent) final PendingResult pendingResult=goAsync();Task asyncTask=new Task(pendingResult,intent);asyncTask.execute();)Private static class Task extends AsyncTaskprivate final PendingResult pendingResult;private final Intent intent

7、;private Task(PendingResult pendingResult,Intent intent) this.pendingResult=pendingResulfthis, intent二intent;)OverrideProtected String doInBackground(String. strings)(StringBuilder sb=new StringBuilder();sb.append(Action:+intent.getAction()+rr);sb.append(URI:+intent.toUri(Intent.URINTENT_SCHEME).toS

8、tring()+“ir);String log=sb.toString();Log.d(TAQlog);return log;)Overrideprotected void onPostExecute(String s)super.onPostExecute(s);/Must call finish()so the BroadcastReceiver can be recycled.pendingResult.finish();单元6在Activity中定义一个ServiceConnection类和DownloadBinder对象，并初始化代码:private ServiceConnectio

9、n mServiceConnection;private DownloadBinder mDownloadBinder;mServiceConnection-new ServiceConnectionOlpublic voidpublic voidonServiceConnected(ComponentNamename,IBinder service)1mDownloadBinder (DownloadBinder)service;实现 Button3、Button4 Button5 Button6 点击事件代码Button3:Intent bindintent-new Intent(this,MyService class);bindService(bindIntent,mServiceConnection,BIND_ AUTOCREATE);Button4:unbindService(mServiceConnection);Button5:mDownloadB inder. startDownloadO;Button6:mDownloadBinder. getProgressO;