Android往SD卡上存储文件

   packagecn.umgsai.file; 
  
   importjava.io.File;  
   importjava.io.FileNotFoundException;  
   importjava.io.FileOutputStream;  
   importjava.io.InputStream;  
   importjava.io.OutputStream;  
  
   importcn.umgsai.service.FileService;  
  
   importandroid.app.Activity;  
   importandroid.content.Context;  
   importandroid.os.Bundle;  
   importandroid.os.Environment;  
   importandroid.util.Log;  
   importandroid.view.View;  
   importandroid.widget.Button;  
   importandroid.widget.EditText;  
   importandroid.widget.TextView;  
   importandroid.widget.Toast;  
  
   publicclassDataActivityextendsActivity{  
   privateEditTextfilenameText;  
   privateEditTextcontentText;  
   privateTextViewresultView;  
   privatestaticfinalStringTAG="DataActivity";  
   /**Calledwhentheactivityisfirstcreated.*/ 
   @Override 
   publicvoidonCreate(BundlesavedInstanceState){  
   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);  
  Stringfilename=filenameText.getText().toString(); 
   Buttonbutton=(Button)this.findViewById(R.id.button);  
   ButtonshowButton=(Button)this.findViewById(R.id.showButton);  
  button.setOnClickListener(listener); 
  showButton.setOnClickListener(listener); 
  } 
   
   privateView.OnClickListenerlistener=newView.OnClickListener(){  
   @Override 
   publicvoidonClick(Viewv){  
  Buttonbutton=(Button)v; 
  Stringfilename=filenameText.getText().toString(); 
   switch(button.getId()){  
   caseR.id.button://如果是保存按钮  
   intresId=R.string.success;  
   
  Stringcontent=contentText.getText().toString(); 
   Filefile=newFile(Environment.getExternalStorageDirectory(),filename);  
   if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){  
   try{  
   //OutputStreamoutStream=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()==newfile("/sdcard")  
   
   
   FileOutputStreamoutStream=newFileOutputStream(file);  
   try{  
  FileService.save(outStream,content); 
   }catch(Exceptione){  
  Log.e(TAG,e.toString()); 
  resId=R.string.error; 
  } 
   }catch(FileNotFoundExceptione){  
  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;  
   caseR.id.showButton://如果是显示按钮  
   try{  
   InputStreaminStream=DataActivity.this.openFileInput(filename);  
  Stringtext=FileService.read(inStream); 
  resultView.setText(text); 
   }catch(Exceptione){  
  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
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