/** 
* MainActivity 
* 
* @author zuolongsnail 
* 
*/ 
public class MainActivity extends Activity { 
private EditText writeET; 
private Button writeBtn; 
private TextView contentView; 
public static final String FILENAME = "setting.set"; 
@Override 
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.main); 
writeET = (EditText) findViewById(R.id.write_et); 
writeBtn = (Button) findViewById(R.id.write_btn); 
contentView = (TextView) findViewById(R.id.contentview); 
writeBtn.setOnClickListener(new OperateOnClickListener()); 
} 
class OperateOnClickListener implements OnClickListener { 
@Override 
public void onClick(View v) { 
writeFiles(writeET.getText().toString()); 
contentView.setText(readFiles()); 
System.out.println(getFilesDir()); 
} 
} 
// 保存文件内容 
private void writeFiles(String content) { 
try { 
// 打开文件获取输出流，文件不存在则自动创建 
FileOutputStream fos = openFileOutput(FILENAME, 
Context.MODE_PRIVATE); 
fos.write(content.getBytes()); 
fos.close(); 
} catch (Exception e) { 
e.printStackTrace(); 
} 
} 
// 读取文件内容 
private String readFiles() { 
String content = null; 
try { 
FileInputStream fis = openFileInput(FILENAME); 
ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
byte[] buffer = new byte[1024]; 
int len = 0; 
while ((len = fis.read(buffer)) != -1) { 
baos.write(buffer, 0, len); 
} 
content = baos.toString(); 
fis.close(); 
baos.close(); 
} catch (Exception e) { 
e.printStackTrace(); 
} 
return content; 
} 
} 

/** 
* 文件存储数据方式工具类 
* 
* @author zuolongsnail 
*/ 
public class FilesUtil { 
/** 
* 保存文件内容 
* 
* @param c 
* @param fileName 
* 文件名称 
* @param content 
* 内容 
*/ 
private void writeFiles(Context c, String fileName, String content, int mode) 
throws Exception { 
// 打开文件获取输出流，文件不存在则自动创建 
FileOutputStream fos = c.openFileOutput(fileName, mode); 
fos.write(content.getBytes()); 
fos.close(); 
} 
/** 
* 读取文件内容 
* 
* @param c 
* @param fileName 
* 文件名称 
* @return 返回文件内容 
*/ 
private String readFiles(Context c, String fileName) throws Exception { 
ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
FileInputStream fis = c.openFileInput(fileName); 
byte[] buffer = new byte[1024]; 
int len = 0; 
while ((len = fis.read(buffer)) != -1) { 
baos.write(buffer, 0, len); 
} 
String content = baos.toString(); 
fis.close(); 
baos.close(); 
return content; 
} 
}