Android中利用SharedPreferences保存信息

package com.example.sharepreferen;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity implements OnClickListener{
	
	private Button btnSave;
	private EditText etContent;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		btnSave = (Button)findViewById(R.id.btn_save);
		etContent = (EditText)findViewById(R.id.et_content);
		
		//得到SharedPreferences取值
		SharedPreferences preferences = this.getSharedPreferences("config", Context.MODE_PRIVATE);
		String content = preferences.getString("content", "");
		if (!content.trim().equals("")) {
			etContent.setText(content);
		}
		btnSave.setOnClickListener(this);
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.btn_save:
			save(etContent.getText().toString());
			break;
		default:
			break;
		}
		
	}
	
	public void save(String content) {
		//获得SharedPreferences 并进行编辑
		SharedPreferences preferences = this.getSharedPreferences("config", Context.MODE_PRIVATE);
		Editor editor = preferences.edit();
		editor.putString("content", content);
		//记住一定要提交
		editor.commit();
		Toast.makeText(this, "保存成功", 0).show();
	}


}