android之文本阅读器

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1、android之文本阅读器显示和阅读sd卡上的所有文本文件截图如下：代码如下：目录结构ListAllFileActivity.javapackagecom.example.txtreader;importjava.io.File;importjava.util.ArrayList;importjava.util.List;importandroid.os.Bundle;importandroid.os.Environment;importandroid.app.Activity;importand

2、roid.content.Intent;importandroid.view.Menu;importandroid.view.View;importandroid.widget.ArrayAdapter;importandroid.widget.ListView;importandroid.widget.AdapterView;importandroid.widget.AdapterView.OnItemClickListener;publicclassListAllFileActivityext

3、endsActivity{/*文件列表*/privateListfileNameList;privateBundlebundle;//展示SD卡中的所有文件@OverrideprotectedvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_list_all_file);initializeFile();}privatevo

4、idinitializeFile(){Filepath=Environment.getExternalStorageDirectory();File[]f=path.listFiles();putFile(f);}@OverridepublicbooleanonCreateOptionsMenu(Menumenu){//Inflatethemenu;thisaddsitemstotheactionbarifitispresent.getMenuInflater().inflate(R.menu.a

5、ctivity_list_all_file,menu);returntrue;}//读取SD卡中的所有的文件列表，并放到list中privatevoidputFile(File[]f){fileNameList=newArrayList();for(inti=0;i

6、dapteradapter=newArrayAdapter(this,android.R.layout.simple_list_item_1,fileToStrArr(fileNameList));lv.setAdapter(adapter);OnItemClickListenerlistener=newOnItemClickListener(){@OverridepublicvoidonItemClick(AdapterViewparent,Viewview

7、,intposition,longid){Intentintent=newIntent(ListAllFileActivity.this,ViewFile.class);bundle=newBundle();Filefile=fileNameList.get(position);if(file.isDirectory()){File[]f=file.listFiles();putFile(f);}else{bundle.putString("fileName",file.getAbsolutePa

8、th());intent.putExtras(bundle);startActivityForResult(intent,0);}}};lv.setOnItemClickListener(listener);}//检查时文件名或者目录privatebooleanisValid(Filef){if(f.isDirectory()){returntrue;}if(f.getName().endsWith(".txt")){returntrue;}else{returnfalse;}}p