Android入门之文件系统操作（一）简单的文件浏览器 （转）

   1. import java.io.File;    2. import java.util.*;    3.    4. import android.app.Activity;    5. import android.content.Context;    6. import android.os.*;    7. import android.view.*;    8. import android.widget.*;    9. import android.widget.AdapterView.OnItemClickListener;   10. import android.widget.ImageView.ScaleType;   11.   12. public class FileBrowser extends Activity {   13.   14. private ListView mainListView=null;   15. private List<Map<String,Object>> list=null;   16.   17. public void onCreate(Bundle savedInstanceState) {   18. super.onCreate(savedInstanceState);   19. this.setTitle("文件浏览器");   20. mainListView=new ListView(this);   21. setContentView(mainListView);   22.   23. File file=Environment.getRootDirectory();   24. String pathx=file.getAbsolutePath();   25. this.setTitle(pathx);   26. //android的总目录就是"/"   27. list_init("/");   28. }   29.   30. void list_init(String path){   31. File file=new File(path);   32. File[] fileList=file.listFiles();   33. list=new ArrayList<Map<String,Object>>();   34. Map<String,Object> item;   35. item=new HashMap<String,Object>();   36. if(path.equals("/")){   37. item.put("ico",R.drawable.home);   38. item.put("name","总目录列表");   39. item.put("path","/");   40. list.add(item);   41. }else{   42. item.put("ico",R.drawable.back);   43. item.put("name","返回上一级");   44. item.put("path",file.getParent());   45. list.add(item);   46. }   47. for(int i=0;i<fileList.length;i++){   48. item=new HashMap<String,Object>();   49. if(fileList[i].isDirectory()){   50. if(fileList[i].list().length<1){   51. item.put("ico",R.drawable.file1);   52. }else{   53. item.put("ico",R.drawable.file2);   54. }   55. }else{   56. item.put("ico",R.drawable.content);   57. }   58. item.put("name",fileList[i].getName());   59. item.put("path",fileList[i].getAbsolutePath());   60. list.add(item);   61. }   62. MyAdapter ma=new MyAdapter(this,list);   63. //mainListView=new ListView(this);   64. mainListView.setAdapter(ma);   65. mainListView.setOnItemClickListener(new OnItemClickListener(){   66. public void onItemClick(AdapterView<?> arg0, View arg1,int arg2, long arg3) {   67. if(arg2>0 && (Integer)(list.get(arg2).get("ico"))==R.drawable.content){   68. //非文件夹图标，点击无效   69. }else{   70. //打开下一级文件目录列表   71. list_init((String)(list.get(arg2).get("path")));   72. }   73. }   74. });   75. this.setTitle(path);   76. }   77.   78. public class MyAdapter extends BaseAdapter{   79.   80. Context context=null;   81. List<Map<String,Object>> list=null;   82.   83. MyAdapter(Context context,List<Map<String,Object>> list){   84. this.context=context;   85. this.list=list;   86. }   87. public int getCount() {return list.size();}   88. public Object getItem(int position) {return position;}   89. public long getItemId(int position) {return position;}   90.   91. public View getView(int position, View convertView, ViewGroup parent) {   92. LinearLayout returnView=new LinearLayout(context);   93. returnView.setLayoutParams(new ListView.LayoutParams(-1,-2));//注意:ListView.LayoutParams   94. //图标   95. ImageView iv=new ImageView(context);   96. LinearLayout.LayoutParams lp_iv=new LinearLayout.LayoutParams(-2,-2);   97. lp_iv.rightMargin=10;   98. iv.setLayoutParams(lp_iv);   99. iv.setScaleType(ScaleType.CENTER_INSIDE);  100. iv.setImageResource((Integer)((list.get(position)).get("ico")));  101. returnView.addView(iv);  102. //文件名  103. TextView name=new TextView(context);  104. LinearLayout.LayoutParams lp_tv=new LinearLayout.LayoutParams(-2,-2);  105. name.setLayoutParams(lp_tv);  106. name.setTextSize(name.getTextSize()+10);  107. name.setText((String)(list.get(position).get("name")));  108. returnView.addView(name);  109. //  110. return returnView;  111. }  112.  113. }  114. }