android学习笔记9--------------SD卡读写文件

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把文件存入SD卡中

首先加入读写权限

SD卡创建与删除文件权限

<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"></uses-permission>

SD卡写入数据权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

点击保存前：

点击保存：

SD卡根目录多了123.txt文件

点击读取：

读取成功。

代码：

[java]
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

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;
import android.widget.TextView;
import android.widget.Toast;

import com.luku.file.service.FileService;

public class fileActivity extends Activity
{
    private EditText editText=null;
    private Button   button =null;
    private TextView content =null;
    private Button   read=null;
    private TextView textView1=null;
    private Button   exit=null;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        textView1=(TextView)findViewById(R.id.textView1);
        content=(TextView)findViewById(R.id.content);
        editText=(EditText)findViewById(R.id.filename);
        button=(Button)findViewById(R.id.baocun);
        read=(Button)findViewById(R.id.read);
        exit=(Button)findViewById(R.id.exit);

        button.setOnClickListener(listener);
        read.setOnClickListener(listener);
        exit.setOnClickListener(listener);
    }

    private OnClickListener listener=new OnClickListener()
    {
        int resId = R.string.success;
        @Override
        public void onClick(View v)
        {
            Button btn=(Button)v;
            File file=new File(Environment.getExternalStorageDirectory(),//得到SD卡根目录
                    editText.getText().toString());                      //保存文件的文件名

            switch (btn.getId())
            {
                case R.id.baocun:
                if(Environment.getExternalStorageState().
                        equals(Environment.MEDIA_MOUNTED)) //判断SD卡是否存在，并且可以可以读写
                {
                    try
                    {
                        FileOutputStream stream=new FileOutputStream(file);
                        FileService.save(stream, content.getText().toString());
                    }
                    catch (IOException e)
                    {
                        e.printStackTrace();
                        resId = R.string.error;
                        Toast.makeText(fileActivity.this, resId, Toast.LENGTH_LONG).show();
                    }
                    Toast.makeText(fileActivity.this, resId, Toast.LENGTH_LONG).show();
                }
                else
           &nbs

补充：移动开发 , Android ,