Android学习之 文件存储

首先给大家介绍使用文件如何对数据进行存储，Activity提供了openFileOutput()方法可以用于把数据输出到文件中。

直接贴代码：

布局文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <TextView        android:id="@+id/showmsg"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/hello_world" />    <TextView        android:id="@+id/showinfo"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/hello_world"         android:layout_below="@id/showmsg"        /></RelativeLayout>

MainActivity.java

package com.example.filestorage;import java.io.ByteArrayOutputStream;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.PrintStream;import java.util.Scanner;import org.apache.http.util.ByteArrayBuffer;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.widget.TextView;public class MainActivity extends Activity {//接收文件输出对象FileOutputStream output=null;//写入文件对象FileInputStream input=null;private  TextView showmsg;private  TextView showinfo;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);showmsg=(TextView) findViewById(R.id.showmsg);showinfo=(TextView) findViewById(R.id.showinfo);//将内容保存到文件try {output=super.openFileOutput("ha.txt", MainActivity.MODE_PRIVATE);} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}PrintStream print=new PrintStream(output);print.println("姓名：Android");print.println("  ");print.println("年龄：20");print.println("  ");print.println("电话：110");print.close();//从文件中读入内容try {input=super.openFileInput("ha.txt");ByteArrayOutputStream stream=new ByteArrayOutputStream();byte[] buffer=new byte[1024];    int length=-1;    while((length=input.read(buffer))!=-1)   {            stream.write(buffer,0,length);    }    stream.close();        showmsg.setText("个人信息"+"\n"+stream.toString());    input.close();    //第二种方式读取文件内容    input=super.openFileInput("ha.txt");    Scanner scanner=new Scanner(input);    showinfo.setText("个人信息");    while (scanner.hasNext()) {        showinfo.append("\n");    showinfo.append(scanner.next()+"\n");}    scanner.close();    input.close();} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}@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;}}

运行效果展示：

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