android 读取根目录下的文件或文件夹

 1 @Override 
 2 public void onCreate(Bundle savedInstanceState) { 
 3    super.onCreate(savedInstanceState); 
 4    setContentView(R.layout.main);  
 5    EditText keywordText = (EditText)this.findViewById(R.id.keyword); 
 6    Button button = (Button)this.findViewById(R.id.button); 
 7    TextView result = (TextView)this.findViewById(R.id.result); 
 8    button.setOnClickListener(new Button.OnClickListener() { 
 9       public void onClick(View v) {
10          String keyword = keywordText.getText().toString(); 
11          if (keyword.equals("")) { 
12              result.setText("请勿输入空白的关键词!!"); 
13          }else { 
14            result.setText(searchFile(keyword)); 
15          } 
16      } 
17   }); 
18 }
19 
20 private String searchFile(String keyword) { 
21    String result = ""; 
22    File[] files = new File("/").listFiles(); 
23    for (File file : files) { 
24      if (fike.getName().indexOf(keyword) >= 0) { 
25        result += file.getPath() + "\n"; 
26      } 
27    } 
28   if (result.equals("")){
29     result = "找不到文件!!"; 
30   }
31  return result; 
32 }