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03_Android项目中读写文本文件的代码

發(fā)布時間：2024/9/27 Android 23 豆豆

生活随笔收集整理的這篇文章主要介紹了 03_Android项目中读写文本文件的代码小編覺得挺不錯的,現(xiàn)在分享給大家,幫大家做個參考.

編寫一下Android界面的項目

使用默認的Android清單文件

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

??? package="com.itheima28.writedata"

??? android:versionCode="1"

??? android:versionName="1.0" >

??? <uses-sdk

??????? android:minSdkVersion="8"

??????? android:targetSdkVersion="19" />

??? <application

??????? android:allowBackup="true"

??????? android:icon="@drawable/ic_launcher"

??????? android:label="@string/app_name"

??????? android:theme="@style/AppTheme" >

??????? <activity

??????????? android:name="com.itheima28.writedata.MainActivity"

??????????? android:label="@string/app_name" >

??????????? <intent-filter>

??????????????? <action android:name="android.intent.action.MAIN" />

??????????????? <category android:name="android.intent.category.LAUNCHER" />

??????????? </intent-filter>

??????? </activity>

??? </application>

</manifest>

Android布局文件

<LinearLayout 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:orientation="vertical"

??? tools:context=".MainActivity">

??? <Button

??????? android:id="@+id/btn_read_private"

??????? android:layout_width="wrap_content"

??????? android:layout_height="wrap_content"

??????? android:text="讀私有文件" />

??? <Button

??????? android:id="@+id/btn_write_private"

??????? android:layout_width="wrap_content"

??????? android:layout_height="wrap_content"

??????? android:text="寫私有文件" />

??? <Button

??????? android:id="@+id/btn_read_readable"

??????? android:layout_width="wrap_content"

??????? android:layout_height="wrap_content"

??????? android:text="讀可讀文件" />

??? <Button

??????? android:id="@+id/btn_write_readable"

??????? android:layout_width="wrap_content"

??????? android:layout_height="wrap_content"

??????? android:text="寫可讀文件" />

??? <Button

??????? android:id="@+id/btn_read_writeable"

??????? android:layout_width="wrap_content"

??????? android:layout_height="wrap_content"

??????? android:text="讀可寫文件" />

??? <Button

??????? android:id="@+id/btn_write_writeable"

??????? android:layout_width="wrap_content"

??????? android:layout_height="wrap_content"

??????? android:text="寫可寫文件" />

??? <Button

??????? android:id="@+id/btn_read_readable_writeable"

??????? android:layout_width="wrap_content"

??????? android:layout_height="wrap_content"

??????? android:text="讀可讀可寫文件" />

??? <Button

??????? android:id="@+id/btn_write_readable_writeable"

??????? android:layout_width="wrap_content"

??????? android:layout_height="wrap_content"

??????? android:text="寫可讀可寫文件" />

</LinearLayout>

4 Android中的寫文本文件的代碼

package com.itheima28.writedata;

import java.io.BufferedReader;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStreamReader;

import android.content.Context;

import android.os.Bundle;

import android.support.v7.app.ActionBarActivity;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Toast;

/**

?* 讀寫文件

?* 注意可以將寫文件和寫文件的兩個功能分別寫到不同的項目中進行測試

?* @author toto

?*/

public class MainActivity extends ActionBarActivity implements OnClickListener{

??? //這個路徑是文件所在路徑

???????? private String basicPath = "/data/data/com.itheima28.writedata/files/";

????????

???????? @Override

???????? protected void onCreate(Bundle savedInstanceState) {

?????????????????? super.onCreate(savedInstanceState);

?????????????????? setContentView(R.layout.activity_main);

?????????????????? // 寫數(shù)據(jù)

?????????????????? // 私有文件

?????????????????? writeToLocal("private.txt", Context.MODE_PRIVATE);

?????????????????? // 可讀文件

?????????????????? writeToLocal("readable.txt", Context.MODE_WORLD_READABLE);

?????????????????? // 可寫文件

?????????????????? writeToLocal("writeable.txt", Context.MODE_WORLD_WRITEABLE);

?????????????????? // 可讀可寫文件

?????????????????? writeToLocal("readable_writeable.txt", Context.MODE_WORLD_READABLE

???????????????????????????????????? + Context.MODE_WORLD_WRITEABLE);

??????????????????

?????????????????? findViewById(R.id.btn_read_private).setOnClickListener(this);

?????????????????? findViewById(R.id.btn_write_private).setOnClickListener(this);

??????????????????

?????????????????? findViewById(R.id.btn_read_readable).setOnClickListener(this);

?????????????????? findViewById(R.id.btn_write_readable).setOnClickListener(this);

??????????????????

?????????????????? findViewById(R.id.btn_read_writeable).setOnClickListener(this);

?????????????????? findViewById(R.id.btn_write_writeable).setOnClickListener(this);

??????????????????

?????????????????? findViewById(R.id.btn_read_readable_writeable).setOnClickListener(this);

?????????????????? findViewById(R.id.btn_write_readable_writeable).setOnClickListener(this);

???????? }

???????? /**

???????? ?* 寫文件

???????? ?* @param fileName

???????? ?* @param mode

???????? ?*/

???????? private void writeToLocal(String fileName, int mode) {

?????????????????? try {

??????????????????????????? FileOutputStream fos = openFileOutput(fileName, mode);

??????????????????????????? fos.write(("第一個程序寫的數(shù)據(jù)：" + fileName).getBytes());

??????????????????????????? fos.flush();

??????????????????????????? fos.close();

?????????????????? } catch (Exception e) {

??????????????????????????? e.printStackTrace();

?????????????????? }

???????? }

????????

???????? /**

???????? ?* 哪一個控件被點擊, v對象就代表被點擊的對象

???????? ?*/

???????? @Override

???????? public void onClick(View v) {

?????????????????? switch (v.getId()) {

?????????????????? case R.id.btn_read_private:

??????????????????????????? readFile("private.txt");