3.Android I/O文件写入和读取

 1 package min.conquer;
 2 
 3 import java.io.File;
 4 import java.io.FileInputStream;
 5 import java.io.FileOutputStream;
 6 import java.io.IOException;
 7 
 8 import org.apache.http.util.EncodingUtils;
 9 
10 import android.app.Activity;
11 import android.os.Bundle;
12 import android.util.Log;
13 import android.widget.TextView;
14 
15 public class IoActivity extends Activity {
16     private FileInputStream in;
17     private FileOutputStream out;
18     private File file;
19     final String TAG = "嘿嘿写入文件了";
20     String display;
21     String PATH = "/data/data/min.conquer";
22     String NAME = "kk.txt";
23     /** Called when the activity is first created. */
24     @Override
25     public void onCreate(Bundle savedInstanceState) {
26         super.onCreate(savedInstanceState);
27         file = new File(PATH , NAME);
28         try{
29             file.createNewFile();
30             
31             out = new FileOutputStream(file);
32             out.write(TAG.getBytes());
33             
34             int length = (int)file.length();
35             byte[] temp = new byte[length];
36             in = new FileInputStream(file);
37             in.read(temp, 0, length);
38             
39             display = EncodingUtils.getString(temp, "UTF-8");
40             in.close();
41         }catch(IOException e){
42             Log.e(TAG, e.toString());
43         }
44         
45         TextView tv = new TextView(this);
46         tv.setText(display);
47         setContentView(tv);
48     }
49 }