Android往SD卡上存储文件

 

 
 

package cn.umgsai.file;  
  
  
 
  
  

import java.io.File;  

  
  

import java.io.FileNotFoundException;  

  
  

import java.io.FileOutputStream;  

  
  

import java.io.InputStream;  

  
  

import java.io.OutputStream;  

  
  
 
  
  

import cn.umgsai.service.FileService;  

  
  
 
  
  

import android.app.Activity;  

  
  

import android.content.Context;  

  
  

import android.os.Bundle;  

  
  

import android.os.Environment;  

  
  

import android.util.Log;  

  
  

import android.view.View;  

  
  

import android.widget.Button;  

  
  

import android.widget.EditText;  

  
  

import android.widget.TextView;  

  
  

import android.widget.Toast;  

  
  
 
  
  

public class DataActivity extends Activity {  

  
  

    private EditText filenameText;  

  
  

    private EditText contentText;  

  
  

    private TextView resultView;  

  
  

    private static final String TAG = "DataActivity";  

  
  

    /** Called when the activity is first created. */ 

  
  

    @Override 

  
  

        public void onCreate(Bundle savedInstanceState) {  

  
  

        super.onCreate(savedInstanceState);  

  
  
        setContentView(R.layout.main);  
  
  

        filenameText = (EditText) this.findViewById(R.id.filename);  

  
  

        contentText = (EditText) this.findViewById(R.id.content);  

  
  

        resultView = (TextView) this.findViewById(R.id.result);  

  
  
        String filename = filenameText.getText().toString();  
  
  

        Button button = (Button) this.findViewById(R.id.button);  

  
  

        Button showButton = (Button) this.findViewById(R.id.showButton);  

  
  
        button.setOnClickListener(listener);  
  
  
        showButton.setOnClickListener(listener);  
  
  
    }  
  
  
      
  
  

    private View.OnClickListener listener = new View.OnClickListener() {   

  
  

        @Override 

  
  

            public void onClick(View v) {  

  
  
            Button button = (Button) v;  
  
  
            String filename = filenameText.getText().toString();  
  
  

            switch(button.getId()){  

  
  

            case R.id.button://如果是保存按钮  

  
  

                int resId = R.string.success;  

  
  
                  
  
  
                String content = contentText.getText().toString();  
  
  

                File file = new File(Environment.getExternalStorageDirectory(),filename);  

  
  

                if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){  

  
  

                    try {  

  
  

                        //OutputStream outStream = DataActivity.this.openFileOutput(filename, Context.MODE_WORLD_WRITEABLE+Context.MODE_WORLD_READABLE);  

  
  

                        //四中操作模式  

  
  

                        //Context.MODE_PRIVATE=0 覆盖、私有  

  
  

                        //Context.MODE_APPEND=32768追加、私有  

  
  

                        //Context.MODE_WORLD_READABLE=1其他的程序可以访问  

  
  

                        //Context.MODE_WORLD_WRITEABLE=2  

  
  

                        //Environment.getExternalStorageDirectory()==new file("/sdcard")  

  
  
                          
  
  
                          
  
  

                        FileOutputStream outStream = new FileOutputStream(file);  

  
  

                        try {  

  
  
                            FileService.save(outStream, content);  
  
  

                        } catch (Exception e) {  

  
  
                            Log.e(TAG, e.toString());  
  
  
                            resId = R.string.error;  
  
  
                        }  
  
  

                    } catch (FileNotFoundException e) {  

  
  
                        Log.e(TAG, e.toString());  
  
  
                        resId = R.string.error;  
  
  
                    }  
  
  

                    Toast.makeText(DataActivity.this, resId, Toast.LENGTH_LONG).show();  

  
  
                }  
  
  

                else{  

  
  

                    Toast.makeText(DataActivity.this,"SD卡不存在或者写保护", Toast.LENGTH_LONG).show();  

  
  
                }  
  
  

                break;  

  
  

            case R.id.showButton://如果是显示按钮  

  
  

                try {  

  
  

                    InputStream inStream = DataActivity.this.openFileInput(filename);  

  
  
                    String text = FileService.read(inStream);  
  
  
                    resultView.setText(text);  
  
  

                } catch (Exception e) {  

  
  
                    Log.e(TAG, e.toString());  
  
  
                    resId = R.string.error;  
  
  

                    Toast.makeText(DataActivity.this, "读取失败", Toast.LENGTH_LONG).show();  

  
  
                }  
  
  
                  
  
  

                break;  

  
  
            }  
  
  
        }  
  
  
    };  
  
  
      
  
  
}  
 
 

 

本文出自 “阿凡达” 博客，请务必保留此出处http://shamrock.blog.51cto.com/2079212/702525