测试文件操作的小程序android

package com.file.test; import android.app.Activity; import android.os.Bundle; import java.io.FileInputStream; import java.io.FileOutputStream; import com.file.test.R.id; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; public class FileActivity extends Activity { private Button b1,b2; private static final String FILE_NAME="temp.txt"; private EditText et1,et2; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); b1=(Button)findViewById(R.id.Button01); b2=(Button)findViewById(R.id.Button02); et1=(EditText)findViewById(R.id.EditText01); et2=(EditText)findViewById(id.EditText02); b1.setOnClickListener(new OnClickListener(){ public void onClick(View v){ write(et1.getText().toString()); } }); b2.setOnClickListener(new OnClickListener(){ public void onClick(View v){ et2.setText(read()); } }); } private String read(){ try{ FileInputStream fis=openFileInput(FILE_NAME); byte[] buffer =new byte[fis.available()]; fis.read(buffer); return new String(buffer); } catch(Exception e){ e.printStackTrace(); } return null; } private void write(String content){ try{ FileOutputStream fos=openFileOutput(FILE_NAME,MODE_APPEND); fos.write(content.getBytes()); fos.close(); } catch(Exception e){ e.printStackTrace(); } } }