Android 主题切换

    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;

}

}