Android的SD卡文件读写(转)
使用右上角的两个按钮可以将文件从模拟器中导出和导入
程序运行的结果
运行之后，文件浏览器中的delete被删除了。
FileHelper.java是文件的帮助类，完成文件创建、删除、读。
package com.zeph.android.fileoperate;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import android.content.Context;
import android.os.Environment;
public class FileHelper {
private Context context;
/** SD卡是否存在**/
private boolean hasSD = false;
/** SD卡的路径**/
private String SDPATH;
/** 当前程序包的路径**/
private String FILESPATH;
public FileHelper(Context context) {
this.context = context;
hasSD = Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
SDPATH = Environment.getExternalStorageDirectory().getPath();
FILESPATH = this.context.getFilesDir().getPath();
}
/**
* 在SD卡上创建文件
*
* @throws IOException
*/
public File createSDFile(String fileName) throws IOException {
File file = new File(SDPATH + "//" + fileName);
if (!file.exists()) {
file.createNewFile();
}
return file;
}
/**
* 删除SD卡上的文件
*
* @param fileName
*/
public boolean deleteSDFile(String fileName) {
File file = new File(SDPATH + "//" + fileName);
if (file == null || !file.exists() || file.isDirectory())
return false;
return file.delete();
}
/**
* 读取SD卡中文本文件
*
* @param fileName
* @return
*/
public String readSDFile(String fileName) {
StringBuffer sb = new StringBuffer();
File file = new File(SDPATH + "//" + fileName);
try {
FileInputStream fis = new FileInputStream(file);
int c;
while ((c = fis.read()) != -1) {
sb.append((char) c);
}
fis.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return sb.toString();
}
public String getFILESPATH() {
return FILESPATH;
}
public String getSDPATH() {
return SDPATH;
}
public boolean hasSD() {
return hasSD;
}
}
Activity类
package com.zeph.android.fileoperate;
import java.io.IOException;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class FileOperateActivity extends Activity {
private TextView hasSDTextView;
private TextView SDPathTextView;
private TextView FILESpathTextView;
private TextView createFileTextView;
private TextView readFileTextView;
private TextView deleteFileTextView;
private FileHelper helper;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
hasSDTextView = (TextView) findViewById(R.id.hasSDTextView);
SDPathTextView = (TextView) findViewById(R.id.SDPathTextView);
FILESpathTextView = (TextView) findViewById(R.id.FILESpathTextView);
createFileTextView = (TextView) findViewById(R.id.createFileTextView);
readFileTextView = (TextView) findViewById(R.id.readFileTextView);
deleteFileTextView = (TextView) findViewById(R.id.deleteFileTextView);
helper = new FileHelper(getApplicationContext());
hasSDTextView.setText("SD卡是否存在:" + helper.hasSD());
SDPathTextView.setText("SD卡路径:" + helper.getSDPATH());
FILESpathTextView.setText("包路径:" + helper.getFILESPATH());
try {
createFileTextView.setText("创建文件："
+ helper.createSDFile("test.txt").getAbsolutePath());
} catch (IOException e) {
e.printStackTrace();
}
deleteFileTextView.setText("删除文件是否成功:"
+ helper.deleteSDFile("delete.txt"));
readFileTextView.setText("读取文件:" + helper.readSDFile("benzeph.txt"));
}
}
Layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/hasSDTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<TextView
android:id="@+id/SDPathTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<TextView
android:id="@+id/FILESpathTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<TextView
android:id="@+id/createFileTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="false" />
<TextView
android:id="@+id/readFileTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="false" />
<TextView
android:id="@+id/deleteFileTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="false" />
</LinearLayout>
注意一定要在Manifest中加入读取外部设备的条件允许，我之前就是一直忘记加入，导致文件老是不能创建和删除。
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
