- package sp.mft;
- import java.io.BufferedReader;
- import java.io.File;
- import java.io.FileInputStream;
- import java.io.FileNotFoundException;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.InputStreamReader;
- import java.io.OutputStream;
- import java.io.OutputStreamWriter;
- import java.io.UnsupportedEncodingException;
- import android.app.Activity;
- import android.content.Context;
- import android.content.SharedPreferences;
- import android.os.Bundle;
- import android.os.Environment;
- import android.util.Log;
- public class SpActivity extends Activity {
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- String filePath = "ip_sensor"; //sdcartpath/ipsensor/
- String fileName = "sensor_list.xml";
- //写文件
- writeToXml(SpActivity.this,"i want write in",getSdcardPath()+filePath,fileName);
- //读文件
- String readXml = ReadTxtFile(getSdcardPath()+filePath+"/"+fileName);
- System.out.println(readXml);
- }
- ////写文件
- public static int writeToXml(Context context, String str,String file_path,String file_name){
- int result = 0;
- File path = new File(file_path);
- File file = new File(file_path+"/"+file_name);
- if (!path.exists()) {
- // 路径不存在? Just 创建
- path.mkdirs();
- }
- if (!file.exists()) {
- // 文件不存在、 Just创建
- try {
- file.createNewFile();
- } catch (IOException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- }
- OutputStreamWriter osw = null;
- try {
- osw = new OutputStreamWriter(new FileOutputStream(
- file));
- } catch (FileNotFoundException e1) {
- // TODO Auto-generated catch block
- e1.printStackTrace();
- }
- try {
- osw.write(str);
- osw.close();
- } catch (IOException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- return result;
- }
- /// 读文件
- public static String ReadTxtFile(String strFilePath)
- {
- String path = strFilePath;
- String content = ""; //文件内容字符串
- //打开文件
- File file = new File(path);
- //如果path是传递过来的参数,可以做一个非目录的判断
- if (file.isDirectory())
- {
- Log.d("TestFile", "The File doesn't not exist.");
- }
- else
- {
- try {
- InputStream instream = new FileInputStream(file);
- if (instream != null)
- {
- InputStreamReader inputreader = new InputStreamReader(instream);
- BufferedReader buffreader = new BufferedReader(inputreader);
- String line;
- //分行读取
- while (( line = buffreader.readLine()) != null) {
- content += line + "\n";
- }
- instream.close();
- }
- }
- catch (java.io.FileNotFoundException e)
- {
- Log.d("TestFile", "The File doesn't not exist.");
- }
- catch (IOException e)
- {
- Log.d("TestFile", e.getMessage());
- }
- }
- return content;
- }
- // 获取sdCard路径
- public static String getSdcardPath()
- {
- // 定义一个空字符串,存储sdcard路径
- String sdcardPath = "";
- // 定义一个File类型的变量,存储sdcard的路径
- File sdcardPathFile = null;
- // 判断sdcard是否存在
- boolean isSdcardExist = Environment.getExternalStorageState().equals(
- Environment.MEDIA_MOUNTED);
- if (isSdcardExist)
- {
- // 将路径值赋给变量sdcardPath
- sdcardPathFile = Environment.getExternalStorageDirectory();
- sdcardPath = sdcardPathFile.toString() + "/";
- }
- else
- {
- // 将路径值赋给变量sdcardPath
- sdcardPathFile = Environment.getRootDirectory();
- sdcardPath = sdcardPathFile.toString() + "/";
- }
- // 最后返回一个保存sdcard路径的字符串
- return sdcardPath;
- }
- //\\
- }
package sp.mft; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.UnsupportedEncodingException; import android.app.Activity; import android.content.Context; import android.content.SharedPreferences; import android.os.Bundle; import android.os.Environment; import android.util.Log; public class SpActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); String filePath = "ip_sensor"; //sdcartpath/ipsensor/ String fileName = "sensor_list.xml"; //写文件 writeToXml(SpActivity.this,"i want write in",getSdcardPath()+filePath,fileName); //读文件 String readXml = ReadTxtFile(getSdcardPath()+filePath+"/"+fileName); System.out.println(readXml); } ////写文件 public static int writeToXml(Context context, String str,String file_path,String file_name){ int result = 0; File path = new File(file_path); File file = new File(file_path+"/"+file_name); if (!path.exists()) { // 路径不存在? Just 创建 path.mkdirs(); } if (!file.exists()) { // 文件不存在、 Just创建 try { file.createNewFile(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } OutputStreamWriter osw = null; try { osw = new OutputStreamWriter(new FileOutputStream( file)); } catch (FileNotFoundException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } try { osw.write(str); osw.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return result; } /// 读文件 public static String ReadTxtFile(String strFilePath) { String path = strFilePath; String content = ""; //文件内容字符串 //打开文件 File file = new File(path); //如果path是传递过来的参数,可以做一个非目录的判断 if (file.isDirectory()) { Log.d("TestFile", "The File doesn't not exist."); } else { try { InputStream instream = new FileInputStream(file); if (instream != null) { InputStreamReader inputreader = new InputStreamReader(instream); BufferedReader buffreader = new BufferedReader(inputreader); String line; //分行读取 while (( line = buffreader.readLine()) != null) { content += line + "\n"; } instream.close(); } } catch (java.io.FileNotFoundException e) { Log.d("TestFile", "The File doesn't not exist."); } catch (IOException e) { Log.d("TestFile", e.getMessage()); } } return content; } // 获取sdCard路径 public static String getSdcardPath() { // 定义一个空字符串,存储sdcard路径 String sdcardPath = ""; // 定义一个File类型的变量,存储sdcard的路径 File sdcardPathFile = null; // 判断sdcard是否存在 boolean isSdcardExist = Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED); if (isSdcardExist) { // 将路径值赋给变量sdcardPath sdcardPathFile = Environment.getExternalStorageDirectory(); sdcardPath = sdcardPathFile.toString() + "/"; } else { // 将路径值赋给变量sdcardPath sdcardPathFile = Environment.getRootDirectory(); sdcardPath = sdcardPathFile.toString() + "/"; } // 最后返回一个保存sdcard路径的字符串 return sdcardPath; } //\\ }
然后是是 xml 加入 权限
- <!-- 在SDCard中创建与删除文件权限 -->
- <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
- <!-- 往SDCard写入数据权限 -->
- <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
- package sp.mft;
- import java.io.BufferedReader;
- import java.io.File;
- import java.io.FileInputStream;
- import java.io.FileNotFoundException;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.InputStreamReader;
- import java.io.OutputStream;
- import java.io.OutputStreamWriter;
- import java.io.UnsupportedEncodingException;
- import android.app.Activity;
- import android.content.Context;
- import android.content.SharedPreferences;
- import android.os.Bundle;
- import android.os.Environment;
- import android.util.Log;
- public class SpActivity extends Activity {
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- String filePath = "ip_sensor"; //sdcartpath/ipsensor/
- String fileName = "sensor_list.xml";
- //写文件
- writeToXml(SpActivity.this,"i want write in",getSdcardPath()+filePath,fileName);
- //读文件
- String readXml = ReadTxtFile(getSdcardPath()+filePath+"/"+fileName);
- System.out.println(readXml);
- }
- ////写文件
- public static int writeToXml(Context context, String str,String file_path,String file_name){
- int result = 0;
- File path = new File(file_path);
- File file = new File(file_path+"/"+file_name);
- if (!path.exists()) {
- // 路径不存在? Just 创建
- path.mkdirs();
- }
- if (!file.exists()) {
- // 文件不存在、 Just创建
- try {
- file.createNewFile();
- } catch (IOException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- }
- OutputStreamWriter osw = null;
- try {
- osw = new OutputStreamWriter(new FileOutputStream(
- file));
- } catch (FileNotFoundException e1) {
- // TODO Auto-generated catch block
- e1.printStackTrace();
- }
- try {
- osw.write(str);
- osw.close();
- } catch (IOException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- return result;
- }
- /// 读文件
- public static String ReadTxtFile(String strFilePath)
- {
- String path = strFilePath;
- String content = ""; //文件内容字符串
- //打开文件
- File file = new File(path);
- //如果path是传递过来的参数,可以做一个非目录的判断
- if (file.isDirectory())
- {
- Log.d("TestFile", "The File doesn't not exist.");
- }
- else
- {
- try {
- InputStream instream = new FileInputStream(file);
- if (instream != null)
- {
- InputStreamReader inputreader = new InputStreamReader(instream);
- BufferedReader buffreader = new BufferedReader(inputreader);
- String line;
- //分行读取
- while (( line = buffreader.readLine()) != null) {
- content += line + "\n";
- }
- instream.close();
- }
- }
- catch (java.io.FileNotFoundException e)
- {
- Log.d("TestFile", "The File doesn't not exist.");
- }
- catch (IOException e)
- {
- Log.d("TestFile", e.getMessage());
- }
- }
- return content;
- }
- // 获取sdCard路径
- public static String getSdcardPath()
- {
- // 定义一个空字符串,存储sdcard路径
- String sdcardPath = "";
- // 定义一个File类型的变量,存储sdcard的路径
- File sdcardPathFile = null;
- // 判断sdcard是否存在
- boolean isSdcardExist = Environment.getExternalStorageState().equals(
- Environment.MEDIA_MOUNTED);
- if (isSdcardExist)
- {
- // 将路径值赋给变量sdcardPath
- sdcardPathFile = Environment.getExternalStorageDirectory();
- sdcardPath = sdcardPathFile.toString() + "/";
- }
- else
- {
- // 将路径值赋给变量sdcardPath
- sdcardPathFile = Environment.getRootDirectory();
- sdcardPath = sdcardPathFile.toString() + "/";
- }
- // 最后返回一个保存sdcard路径的字符串
- return sdcardPath;
- }
- //\\
- }
package sp.mft; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.UnsupportedEncodingException; import android.app.Activity; import android.content.Context; import android.content.SharedPreferences; import android.os.Bundle; import android.os.Environment; import android.util.Log; public class SpActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); String filePath = "ip_sensor"; //sdcartpath/ipsensor/ String fileName = "sensor_list.xml"; //写文件 writeToXml(SpActivity.this,"i want write in",getSdcardPath()+filePath,fileName); //读文件 String readXml = ReadTxtFile(getSdcardPath()+filePath+"/"+fileName); System.out.println(readXml); } ////写文件 public static int writeToXml(Context context, String str,String file_path,String file_name){ int result = 0; File path = new File(file_path); File file = new File(file_path+"/"+file_name); if (!path.exists()) { // 路径不存在? Just 创建 path.mkdirs(); } if (!file.exists()) { // 文件不存在、 Just创建 try { file.createNewFile(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } OutputStreamWriter osw = null; try { osw = new OutputStreamWriter(new FileOutputStream( file)); } catch (FileNotFoundException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } try { osw.write(str); osw.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return result; } /// 读文件 public static String ReadTxtFile(String strFilePath) { String path = strFilePath; String content = ""; //文件内容字符串 //打开文件 File file = new File(path); //如果path是传递过来的参数,可以做一个非目录的判断 if (file.isDirectory()) { Log.d("TestFile", "The File doesn't not exist."); } else { try { InputStream instream = new FileInputStream(file); if (instream != null) { InputStreamReader inputreader = new InputStreamReader(instream); BufferedReader buffreader = new BufferedReader(inputreader); String line; //分行读取 while (( line = buffreader.readLine()) != null) { content += line + "\n"; } instream.close(); } } catch (java.io.FileNotFoundException e) { Log.d("TestFile", "The File doesn't not exist."); } catch (IOException e) { Log.d("TestFile", e.getMessage()); } } return content; } // 获取sdCard路径 public static String getSdcardPath() { // 定义一个空字符串,存储sdcard路径 String sdcardPath = ""; // 定义一个File类型的变量,存储sdcard的路径 File sdcardPathFile = null; // 判断sdcard是否存在 boolean isSdcardExist = Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED); if (isSdcardExist) { // 将路径值赋给变量sdcardPath sdcardPathFile = Environment.getExternalStorageDirectory(); sdcardPath = sdcardPathFile.toString() + "/"; } else { // 将路径值赋给变量sdcardPath sdcardPathFile = Environment.getRootDirectory(); sdcardPath = sdcardPathFile.toString() + "/"; } // 最后返回一个保存sdcard路径的字符串 return sdcardPath; } //\\ }
然后是是 xml 加入 权限
- <!-- 在SDCard中创建与删除文件权限 -->
- <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
- <!-- 往SDCard写入数据权限 -->
- <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>