android很多时候需要考虑缓存的问题，本篇文章主要介绍了Android离线缓存的实例代码，具有一定的参考价值，有兴趣的可以了解一下。
android做到一定程度，需要考虑缓存的问题，不信可以掏出手机看看淘宝等一些app是否无网的情况下还可以浏览，不过大部分app并没有考虑到这些问题，解决Android的缓存有哪些方法呢
1.IO流读写文件
2.数据库
3.LruCache和DiskLruCache
个人比较喜欢sd卡文件读写的方式，原因自己可以去分析。
（1）权限
（2）判断网络连接的状态，有什么用呢？自己想
if (isNetworkAvailable(MainActivity.this)) { Toast.makeText(getApplicationContext(), "当前有可用网络！", Toast.LENGTH_LONG).show(); } else { Toast.makeText(getApplicationContext(), "当前wu可用网络！", Toast.LENGTH_LONG).show(); } public boolean isNetworkAvailable(Activity activity) { Context context = activity.getApplicationContext(); // 获取手机所有连接管理对象（包括对wi-fi,net等连接的管理） ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); if (connectivityManager == null) { return false; } else { // 获取NetworkInfo对象 NetworkInfo[] networkInfo = connectivityManager.getAllNetworkInfo(); if (networkInfo != null && networkInfo.length > 0) { for (int i = 0; i （3）端口写入数据
if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ File sdCardDir = Environment.getExternalStorageDirectory();//获取SDCard目录 File saveFile = new File(sdCardDir, "itcast.txt"); FileOutputStream outStream = new FileOutputStream(saveFile); outStream.write(result.getBytes()); outStream.close(); } （4）读取数据
File sdCardDir = Environment.getExternalStorageDirectory();//获取SDCard目录 File saveFile1 = new File(sdCardDir, "itcast.txt"); BufferedReader br = null; try { br = new BufferedReader(new FileReader(saveFile1)); String readline = ""; StringBuffer sb = new StringBuffer(); while ((readline = br.readLine()) != null) { System.out.println("readline:" + readline); sb.append(readline); } String str = sb.toString(); (5)部分完整demo1
if (isNetworkAvailable(MainActivity.this)) { Toast.makeText(getApplicationContext(), "当前有可用网络！", Toast.LENGTH_LONG).show(); } else { Toast.makeText(getApplicationContext(), "当前wu可用网络！", Toast.LENGTH_LONG).show(); File sdCardDir = Environment.getExternalStorageDirectory();//获取SDCard目录 File saveFile1 = new File(sdCardDir, "itcast.txt"); BufferedReader br = null; try { br = new BufferedReader(new FileReader(saveFile1)); String readline = ""; StringBuffer sb = new StringBuffer(); while ((readline = br.readLine()) != null) { System.out.println("readline:" + readline); sb.append(readline); } String str = sb.toString(); JSONObject jsonObject = new JSONObject(str); JSONArray jsonArray = jsonObject.getJSONArray("data"); for (int i = 0; i (6)部分完整demo2
public String logoutPost(String URL){ String result = ""; try { String data = URLEncoder.encode("UTF-8"); // + "&password=" + URLEncoder.encode(password, "UTF-8");//传递的数据 URL url = new URL(URL); //2、url.openConnection()打开网络链接 HttpURLConnection conn = (HttpURLConnection) url.openConnection(); //3、设置请求的方式 conn.setRequestMethod("POST"); conn.setDoInput(true);//发送POST请求必须设置允许输出 conn.setDoOutput(true);//发送POST请求必须设置允许输入 conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); conn.setRequestProperty("Charset", "utf-8"); conn.setRequestProperty("Content-Length", String.valueOf(data.getBytes().length)); //5、获取输出流 OutputStream os = conn.getOutputStream(); os.write(data.getBytes()); os.flush(); BufferedReader in=new BufferedReader(new InputStreamReader(conn.getInputStream())); String line; while((line=in.readLine())!=null){result+="\n"+line;} if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ File sdCardDir = Environment.getExternalStorageDirectory();//获取SDCard目录 File saveFile = new File(sdCardDir, "itcast.txt"); FileOutputStream outStream = new FileOutputStream(saveFile); outStream.write(result.getBytes()); outStream.close(); } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ProtocolException e) { e.printStackTrace(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return result; } 以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持html中文网。
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