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. }