android sd卡读写 附源码
16lz
2021-01-24
将文件存在sd卡中和存在手机中的思路相同就是路径不同,注意看类中的到sd卡路径的注释
package cn.lee.data;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import cn.lee.Manager.DataManager;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.os.Environment;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class AboutDateActivity extends Activity {private EditText fileNameEditText;private EditText fileContentEditText;private EditText readfileContentEditText;private Button button;private Button readButton;private static final String TAGSTRING = "AboutDateActivity";/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);button = (Button) this.findViewById(R.id.button);readButton = (Button) this.findViewById(R.id.readButton);fileNameEditText = (EditText) this.findViewById(R.id.fileName);fileContentEditText = (EditText) this.findViewById(R.id.fileContent);readfileContentEditText = (EditText) this.findViewById(R.id.readfileContent);// 读取readButton.setOnClickListener(onClickListener);// 保存button.setOnClickListener(onClickListener);}/** * 由于这个内部实现类是一个接口的实例 所以这里把他提取出来 作为一个成员变量 2010-04-18 */private View.OnClickListener onClickListener = new View.OnClickListener() {/** * 由于button的父类是view 所以这里的onclick的参数传来的view v就可以找到这个button */public void onClick(View v) {Button button = (Button) v;// 将父类view强转成子类buttonint info = R.string.sus;String fileNameString = fileNameEditText.getText().toString();/** * 判断sd卡是否存在 Environment.getExternalStorageState() 得到sd卡当前的状态 * * getExternalStorageState() returns MEDIA_MOUNTED if the * media is present and mounted at its mount point with * read/write access. 如果返回 MEDIA_MOUNTED表示外部存储设备存在。并且有读写的权限(因为sd卡有写保护 如果写保护关闭也是没有权限读写的) */if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {if ("".equals(fileNameString)) {info = R.string.sdNotExit;} else {FileOutputStream fileOutputStream = null;FileInputStream fileInputStream = null;try {/** * Environment.getExternalStorageDirectory(); * 得到外存储设备的路径 * */File file = new File(Environment.getExternalStorageDirectory(),fileNameString);switch (button.getId()) {case R.id.button: {// 保存String fileContentString = fileContentEditText.getText().toString();fileOutputStream = new FileOutputStream(file);DataManager.saveDate(fileOutputStream,fileContentString);break;}case R.id.readButton: {//读取fileInputStream = new FileInputStream(file);String contentString = DataManager.readDate(fileInputStream);readfileContentEditText.setText(contentString);break;}default:break;}} catch (Exception e) {// TODO Auto-generated catch blockLog.i(TAGSTRING, e.toString());info = R.string.infor;} finally {try {if (fileOutputStream != null) {fileOutputStream.close();}if (fileInputStream != null) {fileInputStream.close();}} catch (IOException e) {Log.i(TAGSTRING, e.toString());info = R.string.infor;}}}} else {info = R.string.infor;}Toast.makeText(AboutDateActivity.this, info, 1).show();}};}
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