Android存储方式实例教程

package com.test; import android.app.Activity; import android.content.SharedPreferences; import android.os.Bundle; import android.util.DisplayMetrics; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; /** * * @author Administrator * SharedPreferences的存储方法 * getSharedPreferences(SETTING_INFOS, 0); * settings.edit()…… * 获取手机屏幕大小 */ public class TestDemo extends Activity { public static final String SETTING_INFOS = "SETTING_Infos"; public static final String NAME = "NAME"; public static final String PASSWORD = "PASSWORD"; private EditText field_name; private EditText field_pass; private Button field_button; private Button field_buttonScreen; private TextView field_view; private TextView field_viewScreen; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); field_name = (EditText) findViewById(R.id.name); field_pass = (EditText) findViewById(R.id.password); field_button = (Button) findViewById(R.id.button_show); field_view = (TextView) findViewById(R.id.view_show); field_viewScreen = (TextView) findViewById(R.id.button_showScreen); field_buttonScreen = (Button) findViewById(R.id.button_getScreen); SharedPreferences settings = getSharedPreferences(SETTING_INFOS, 0); String name = settings.getString(NAME, ""); String password = settings.getString(PASSWORD, ""); field_view.setText("你原来的帐号是："+name+"\n密码是："+password); field_button.setOnClickListener(new Button.OnClickListener() { @Override public void onClick(View v) { field_view.setText("你刚输入的帐号是："+field_name.getText().toString()+"\n密码是："+field_pass.getText().toString()); } } ); field_buttonScreen.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View v) { DisplayMetrics dm = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(dm); //获得手机的宽带和高度像素单位为px String str = "手机屏幕分辨率为:" + dm.widthPixels +"　*　"+dm.heightPixels; field_viewScreen.setText(str); } }); field_name.setText(name); field_pass.setText(password); } @Override protected void onStop() { // TODO Auto-generated method stub super.onStop(); SharedPreferences settings = getSharedPreferences(SETTING_INFOS, 0); settings.edit() .putString(NAME, field_name.getText().toString()) .putString(PASSWORD, field_pass.getText().toString()) .commit(); } }