android 手机SD卡读写操作(以txt文本为例)实现步骤

AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://scheR_771_11845@as.android.com/apk/res/android"
package="com.tes.textsd"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="16" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application
android:allowBACkup="true"
android:icon="@drawable/ic_launcher"
android:label="@String/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.tes.textsd.FiLeoperateActivity"
android:label="@String/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

FileHelper.java
/**
* @title: FileHelper.java
* @Package com.tes.textsd
* @Description: TODO(用一句话描述该文件做什么)
* @author Alex.Z
* @date 2013-2-26 下午5:45:40
* @version V1.0
*/
package com.tes.textsd;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FiLeoutputStream;
import java.io.FileWriter;
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();
}
/**
* 写入内容到SD卡中的txt文本中
* str为内容
*/
public void writeSDFile(String str,String fileName)
{
try {
FileWriter fw = new FileWriter(SDPATH + "//" + fileName);
File f = new File(SDPATH + "//" + fileName);
fw.write(str);
FiLeoutputStream os = new FiLeoutputStream(f);
DataOutputStream out = new DataOutputStream(os);
out.writeShort(2);
out.writeUTF("");
System.out.println(out);
fw.flush();
fw.close();
System.out.println(fw);
} catch (Exception E) {
}
}
/**
* 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;
}
}

@H_985_2@main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://scheR_771_11845@as.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="Hello" />
<TextView
android:id="@+id/SDPathTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Hello" />
<TextView
android:id="@+id/FILESpathTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="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>

FiLeoperateActivity.class
/**
* @title: FiLeoperateActivity.java
* @Package com.tes.textsd
* @Description: TODO(用一句话描述该文件做什么)
* @author Alex.Z
* @date 2013-2-26 下午5:47:28
* @version V1.0
*/
package com.tes.textsd;
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("xx.txt"));
Helper.writeSDFile("1213212","test.txt");
readFileTextView.setText("读取文件:" + Helper.readSDFile("test.txt"));
}
}