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Android SD卡读写

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【Android SD卡读写】人生必须的知识就是引人向光明方面的明灯。这篇文章主要讲述Android SD卡读写相关的知识，希望能为你提供帮助。

package com.jredu.zuiyou.activity;

import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.jredu.zuiyou.R;
import com.jredu.zuiyou.entity.Student;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class SDActivity extends AppCompatActivity {
ObjectOutputStream oos = null;
ObjectInputStream ois = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sd);
Button write = (Button) findViewById(R.id.write);
write.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
WriteToSD();
}
});
Button read = (Button) findViewById(R.id.read);
read.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ReadFromSD();
}
});
}
public void WriteToSD(){
String state = Environment.getExternalStorageState();
if (state.equals(Environment.MEDIA_MOUNTED)){
File root = Environment.getExternalStorageDirectory();
File TargetDir = new File(root,super.getPackageName());
if (!TargetDir.exists()){
TargetDir.mkdir();
}
try {
oos = new ObjectOutputStream(new FileOutputStream(new File(TargetDir,"yxl.txt")));
Student student = new Student("小明",18);
oos.writeObject(student);
Toast.makeText(getApplication(),"写入成功",Toast.LENGTH_SHORT).show();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
oos.flush();
oos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}else {
Toast.makeText(getApplication(),"没有找到SD卡",Toast.LENGTH_SHORT).show();
}
}
public void ReadFromSD(){
String state = Environment.getExternalStorageState();
if (state.equals(Environment.MEDIA_MOUNTED)){
File root = Environment.getExternalStorageDirectory();
File TargetDir = new File(root,super.getPackageName());
if (!TargetDir.exists()){
TargetDir.mkdir();
}
try {
ois = new ObjectInputStream(new FileInputStream(new File(TargetDir,"/yxl.txt")));
Student student = (Student) ois.readObject();
Toast.makeText(getApplication(),student.getName().toString()+"，"+student.getAge(),Toast.LENGTH_SHORT).show();

} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}finally {
try {
ois.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}else {
Toast.makeText(getApplication(),"没有找到SD卡",Toast.LENGTH_SHORT).show();
}
}
}


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