写文件示例

package com.liyong.Filetest;


import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;


import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;


public class FileTest extends Activity implements OnClickListener{
private EditText editText;
private Button button;
private String message;


@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
editText = (EditText)findViewById(R.id.et);
button = (Button)findViewById(R.id.btn);

load();
editText.setText(message);

button.setOnClickListener(this);
}

void load(){
/** 构建一个properties对象 */
Properties properties = new Properties();
try {
FileInputStream fis = this.openFileInput("message.cfg");
properties.load(fis);
} catch (FileNotFoundException e) {
return;
}catch (IOException ie){
return;
}
/** 读取信息 */
message = String.valueOf(properties.get("message").toString());
}


public boolean saveData(){
Properties properties = new Properties();
message = editText.getText().toString();
properties.setProperty("message", message);
try {
FileOutputStream fos = this.openFileOutput("message.cfg",Context.MODE_WORLD_WRITEABLE);
properties.store(fos ,"");
} catch (Exception e) {
e.printStackTrace();
}
return true;
}

@Override
public void onClick(View view) {
switch(view.getId()){
case R.id.btn:
Log.i("liyong", "save data");
saveData();
break;
default:
Log.i("liyong", "No Deal");
}

}
}