获取android的SDK或者手机目录路径

获取android的SDK或者手机目录路径

Google为我们提供了API来获取SDK或者手机目录路径：

1、获取SD卡目录

　　File file1 = Environment.getExternalStorageDirectory();

2、获取手机内部存储空间的file目录

　　File file2 = getFilesDir();

3、获取内部存储空间的缓存目录

　　File file3 = getCacheDir();

4、检查SD是否被挂载

　　String state = Environment.getExternalStorageState();

　　如果 state==“mounted” 表示被挂载

代码：

com.example.readwrite.MainActivity

 package com.example.readwrite;

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

 import android.app.Activity;
 import android.os.Bundle;
 import android.os.Environment;
 import android.util.Log;

 /**
  * 正斜杠代表根目录 两种最常见的数据存储方式
  *
  * 一、内存 二、本地 1.手机内部存储 2.外部存储设备（SD卡）
  * */
 public class MainActivity extends Activity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         // existSDcard();
         // write();
         listPath();
         //read();
     }

     private void write() {
         // /mnt/sdcard
         File file = Environment.getExternalStorageDirectory();
         FileOutputStream out = null;
         try {
             out = new FileOutputStream(file.getPath() + "/fanfan.txt");
             // out = new FileOutputStream(
             // "/data/data/com.example.readwrite/fanfan.txt");
             out.write("12345".getBytes());
         } catch (IOException e) {
             e.printStackTrace();
         } finally {
             if (out != null) {
                 try {
                     out.close();
                 } catch (IOException e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
                 }
             }
         }
     }

     private void read() {
         FileInputStream in = null;
         try {
             // in = new FileInputStream("/mnt/sdcard/fanfan.txt");
             in = new FileInputStream(
                     "/data/data/com.jiguang.test/databases/rep.db");
             byte[] bytes = new byte[2014];
             int len = in.read(bytes);
             String str = new String(bytes, 0, len);
             Log.d("fanfan", "---------" + str);
         } catch (IOException e) {
             Log.d("fanfan","报错啦"+e.toString());
         } finally {
             if (in != null) {
                 try {
                     in.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }
     }

     /**
      * 检查SD卡是否被挂载
      * */
     private void existSDcard() {
         // 获取SD卡的状态
         String state = Environment.getExternalStorageState();

         if (Environment.MEDIA_MOUNTED.equals(state)) {
             Log.d("fanfan", "有SD卡");
         } else {
             Log.d("fanfan", "没有SD卡");
         }
     }

     /**
      * 通过API获取路径
      * */
     private void listPath() {
         // 获取SD卡目录
         File file1 = Environment.getExternalStorageDirectory();
         Log.d("fanfan", "sd卡----" + file1.getPath());
         // 获取手机内部存储空间的file目录
         File file2 = getFilesDir();
         Log.d("fanfan", "内部存储File----" + file2.getPath());
         // 获取内部存储空间的缓存目录
         File file3 = getCacheDir();
         Log.d("fanfan", "内部存储缓存目录----" + file3.getPath());
     }
 }

获取路径

     /**
      * 检查SD卡是否被挂载
      * */
     private void existSDcard() {
         // 获取SD卡的状态
         String state = Environment.getExternalStorageState();

         if (Environment.MEDIA_MOUNTED.equals(state)) {
             Log.d("fanfan", "有SD卡");
         } else {
             Log.d("fanfan", "没有SD卡");
         }
     }

检查SD卡是否被挂载

     /**
      * 通过API获取路径
      * */
     private void listPath() {
         // 获取SD卡目录
         File file1 = Environment.getExternalStorageDirectory();
         Log.d("fanfan", "sd卡----" + file1.getPath());
         // 获取手机内部存储空间的file目录
         File file2 = getFilesDir();
         Log.d("fanfan", "内部存储File----" + file2.getPath());
         // 获取内部存储空间的缓存目录
         File file3 = getCacheDir();
         Log.d("fanfan", "内部存储缓存目录----" + file3.getPath());
     }

通过API获取路径