Android入門之文件系統操作

Android入門之文件系統操作——簡單的文件浏覽器

1. import java.io.File;
2. import java.util.*;
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;
12. public class FileBrowser extends Activity {
14. private ListView mainListView=null;
15. private List<Map<String,Object>> list=null;
17. public void onCreate(Bundle savedInstanceState) {
18. super.onCreate(savedInstanceState);
19. this.setTitle("文件浏覽器");
20. mainListView=new ListView(this);
21. setContentView(mainListView);
23. File file=Environment.getRootDirectory();
24. String pathx=file.getAbsolutePath();
25. this.setTitle(pathx);
26. //android的總目錄就是"/"
27. list_init("/");
28. }
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","總目錄列表");
39. item.put("path","/");
40. list.add(item);
41. }else{
42. item.put("ico",R.drawable.back);
43. item.put("name","返回上一級");
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. //非文件夾圖標，點擊無效
69. }else{
70. //打開下一級文件目錄列表
71. list_init((String)(list.get(arg2).get("path")));
72. }
73. }
74. });
75. this.setTitle(path);
76. }
78. public class MyAdapter extends BaseAdapter{
80. Context context=null;
81. List<Map<String,Object>> list=null;
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;}
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. //圖標
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. }
113. }
114. }