3.Android I/O文件写入和读取

package min.conquer;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.http.util.EncodingUtils;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

public class IoActivity extends Activity {
    private FileInputStream in;
    private FileOutputStream out;
    private File file;
    final String TAG = "嘿嘿写入文件了";
    String display;
    String PATH = "/data/data/min.conquer";
    String NAME = "kk.txt";
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        file = new File(PATH , NAME);
        try{
            file.createNewFile();
            
            out = new FileOutputStream(file);
            out.write(TAG.getBytes());
            
            int length = (int)file.length();
            byte[] temp = new byte[length];
            in = new FileInputStream(file);
            in.read(temp, 0, length);
            
            display = EncodingUtils.getString(temp, "UTF-8");
            in.close();
        }catch(IOException e){
            Log.e(TAG, e.toString());
        }
        
        TextView tv = new TextView(this);
        tv.setText(display);
        setContentView(tv);
    }
}