android 文本文件（含SD卡）读写

-----------------------------------------------

package com.eboy.filereadwrite;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.eboy.filereadwrite.R.id;
import com.eboy.filereadwrite.R.string;
import com.eboy.service.FileService;

public class MainActivity extends Activity {
    private EditText edtFileName = null;
    private EditText edtFileContent = null;
    private Button btnRead = null;
    private Button btnWrite = null;
    private Button btnSDRead = null;
    private Button btnSDWrite = null;
    private String FileName;
    private String FileContent;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        edtFileName = (EditText) findViewById(R.id.FileName);
        edtFileContent = (EditText) findViewById(R.id.FileContent);
        btnRead = (Button) findViewById(id.btnRead);
        btnWrite = (Button) findViewById(id.btnWrite);
        btnRead.setOnClickListener(new ReadOnClickListener());
        btnWrite.setOnClickListener(new WriteOnClickListener());
        
        btnSDRead = (Button) findViewById(id.btnSDRead);
        btnSDWrite = (Button) findViewById(id.btnSDWrite);
        btnSDRead.setOnClickListener(new SDReadOnClickListener());
        btnSDWrite.setOnClickListener(new SDWriteOnClickListener());
    }
    
    private final class WriteOnClickListener implements View.OnClickListener{

        public void onClick(View v) {
            FileService service = new FileService(getApplicationContext());
            FileName = edtFileName.getText().toString();
            FileContent = edtFileContent.getText().toString();
            try {
                service.write(FileName, FileContent);
                Toast.makeText(getApplicationContext(), string.writeSuccess, Toast.LENGTH_LONG).show();
            }
            catch (Exception e) {
                Toast.makeText(getApplicationContext(), string.writeFail + "，" + e.toString(), Toast.LENGTH_LONG).show();
            }
        }        
    } 
    
    private final class ReadOnClickListener implements View.OnClickListener{

        public void onClick(View v) {
            FileService service = new FileService(getApplicationContext());
            FileName = edtFileName.getText().toString();
            FileContent = edtFileContent.getText().toString();
            try {
                FileContent = service.read(FileName);
                edtFileContent.setText(FileContent);
                Toast.makeText(getApplicationContext(), string.readSuccess, Toast.LENGTH_LONG).show();
            }
            catch (Exception e) {
                Toast.makeText(getApplicationContext(), string.readFail + "，" + e.toString(), Toast.LENGTH_LONG).show();
            }
        }        
    } 
    
    private final class SDWriteOnClickListener implements View.OnClickListener{

        public void onClick(View v) {
            FileService service = new FileService(getApplicationContext());
            FileName = edtFileName.getText().toString();
            FileContent = edtFileContent.getText().toString();
            try {    
                //判断SD卡是否存在
                if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
                    service.writeToSDCard(FileName, FileContent);
                } else {
                    Toast.makeText(getApplicationContext(), string.SDCardNotFound, Toast.LENGTH_LONG).show();
                }
                Toast.makeText(getApplicationContext(), string.writeSuccess, Toast.LENGTH_LONG).show();
            }
            catch (Exception e) {
                Toast.makeText(getApplicationContext(), string.writeFail + "，" + e.toString(), Toast.LENGTH_LONG).show();
            }
        }        
    }
    
    private final class SDReadOnClickListener implements View.OnClickListener{

        public void onClick(View v) {
            FileService service = new FileService(getApplicationContext());
            FileName = edtFileName.getText().toString();
            FileContent = edtFileContent.getText().toString();
            try {
                if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
                    FileContent = service.readFromSDCard(FileName);
                    edtFileContent.setText(FileContent);
                    Toast.makeText(getApplicationContext(), string.readSuccess, Toast.LENGTH_LONG).show();
                } else {
                    Toast.makeText(getApplicationContext(), string.SDCardNotFound, Toast.LENGTH_LONG).show();
                }
            }
            catch (Exception e) {
                Toast.makeText(getApplicationContext(), string.readFail + "，" + e.toString(), Toast.LENGTH_LONG).show();
            }
        }        
    } 

/Files/jxgxy/FileReadWrite.rar