Android SD卡讀取簡單操作

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package com.example.sdcardtest;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStreamReader;import java.io.RandomAccessFile;import android.app.Activity;import android.os.Bundle;import android.os.Environment;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;public class MainActivity extends Activity {final String FILE_NAME = "/baidu/hello.txt";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Button read = (Button) findViewById(R.id.read);Button write = (Button) findViewById(R.id.write);final EditText edit1 = (EditText) findViewById(R.id.editText1);final EditText edit2 = (EditText) findViewById(R.id.editText2);//為write事件綁定監聽器write.setOnClickListener(new OnClickListener() {public void onClick(View v) {write(edit1.getText().toString());edit1.setText("");}});//為read事件綁定監聽器read.setOnClickListener(new OnClickListener() {public void onClick(View v) {edit2.setText(read());}});}public String read(){if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){File sdCardDir = Environment.getExternalStorageDirectory();try {FileInputStream fis = new FileInputStream(sdCardDir.getCanonicalPath() + FILE_NAME);BufferedReader br = new BufferedReader(new InputStreamReader(fis));StringBuilder sb = new StringBuilder("");String line = null;while( (line = br.readLine()) != null ){sb.append(line);}br.close();return sb.toString();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}return null;}public void write(String content){if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){RandomAccessFile raf = null;try {//擷取sd卡的目錄File sdCardDir = Environment.getExternalStorageDirectory();File targetFile = new File(sdCardDir.getCanonicalFile() + FILE_NAME);raf = new RandomAccessFile(targetFile, "rw");raf.seek(targetFile.length());raf.write(content.getBytes());} catch (IOException e) {e.printStackTrace();}try {raf.close();} catch (IOException e) {e.printStackTrace();}}}}=====================布局檔案簡單的兩個按鈕，沒什麼好說的

 

Android SD卡讀取簡單操作