1）在xml里定义主题风格

<style name="NightTheme" parent="android:Theme.Holo">

<!-- API 14 theme customizations can go here. -->

</style>

<style name="LightTheme" parent="android:Theme.Holo.Light.DarkActionBar">

<!-- API 14 theme customizations can go here. -->

</style>


2）在代码中使用getSharedPreferences()方法用来保存主题切换时的状态，在下次

点击‘切换主题’按键时，获取到上次保存的状态并设置

import android.app.Activity;

import android.content.Intent;

import android.content.SharedPreferences;

import android.os.Bundle;

import android.view.View;


public class MainActivity extends Activity {


@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

boolean isDark = readMode();

if(isDark){

//设置主题

setTheme(R.style.NightTheme);

}else{

setTheme(R.style.LightTheme);

}

//关联布局

setContentView(R.layout.activity_main);

}

//设置夜间模式按钮

public void btnNightTheme(View v){

boolean isDark = readMode();

saveMode(!isDark);

finish();

//取消Activity切换动画

overridePendingTransition(0, 0);

Intent intent = new Intent(this,MainActivity.class);

startActivity(intent);

}

//保存主题状态

private void saveMode(boolean isDark) {

SharedPreferences sp = getSharedPreferences("setting", 0);

sp.edit().putBoolean("dark_mode", isDark).commit();

}

//读取主题状体

private boolean readMode() {

SharedPreferences sp = getSharedPreferences("setting", 0);

boolean isDark = sp.getBoolean("dark_mode", false);

return isDark;

}


}