Android文件保存和读取

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();                
                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  
                    try {                         
                        FileService.save(outStream, content);//保存文件                       
                    } 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();               
                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/2079212/702531