Android 主題切換

    1）在xml里定義主題風格

    <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）在代碼中使用getSharedPreferences()方法用來保存主題切換時的狀態，在下次

    點擊‘切換主題’按鍵時，獲取到上次保存的狀態并設置

    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){

//設置主題

setTheme(R.style.NightTheme);

}else{

setTheme(R.style.LightTheme);

}

//關聯布局

setContentView(R.layout.activity_main);

}

//設置夜間模式按鈕

public void btnNightTheme(View v){

boolean isDark = readMode();

saveMode(!isDark);

finish();

//取消Activity切換動畫

overridePendingTransition(0, 0);

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

startActivity(intent);

}

//保存主題狀態

private void saveMode(boolean isDark) {

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

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

}

//讀取主題狀體

private boolean readMode() {

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

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

return isDark;

}

}