android之文件读写实例测试

package com.example.file;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;public class MainActivity extends Activity {private final static String FILE_NAME="temp.txt";private EditText et1,et2;private Button b1,b2;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);et1=(EditText)findViewById(R.id.et1);et2=(EditText)findViewById(R.id.et2);b1=(Button)findViewById(R.id.b1);b2=(Button)findViewById(R.id.b2);b1.setOnClickListener(new OnClickListener(){public void onClick(View view){write(et1.getText().toString());}});b2.setOnClickListener(new OnClickListener(){public void onClick(View view){et2.setText(read());}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}public void write(String content){try{FileOutputStream fos=openFileOutput(FILE_NAME,MODE_APPEND);fos.write(content.getBytes());fos.close();//note}catch(Exception e){e.printStackTrace();}}public String read(){try{FileInputStream fis=openFileInput(FILE_NAME);byte[]Buffer=new byte[fis.available()];fis.read(Buffer);return new String(Buffer);}catch(IOException e){e.printStackTrace();}return null;//note}}

程序运行截图：

 

注意：向文件写入数据时，之前写入的数据不会被覆盖，新写入的数据将会出现在已写数据之后