在Android中改变主题（Android Studio）

Question

我做了4个按钮。每个按钮都可以使用something.changetoTheme（this,something.black）将背景颜色更改为不同的颜色；它工作得很好，但在我关闭应用程序并重新启动后，主题总是设置为默认。有没有办法保存上一个会话的背景，并在重新打开应用程序时查看它？

Answer 1

将开关更改为：

switch (cTheme)
{
    case BLACK:         
        int myTheme = R.style.Default
        activity.setTheme(myTheme);

        //Save your activity theme color
        saveTheme(myTheme);
    break;

    case YELLOW:
        int myTheme = R.style.Green
        activity.setTheme(myTheme);

        //Save your activity theme color
        saveTheme(myTheme);
    break;
}

并将onActivityCreateSetTheme(Activity Activity）更改为：

public static void onActivityCreateSetTheme(Activity activity, Int cTheme)

保存方法

public void saveTheme(int theme)
{
    SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
    SharedPreferences.Editor editor = sharedPreferences.edit();
    prefEditor.putInt("Theme",theme); 
}

public int loadTheme(){
    SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);

    //Load theme color
    int theme = sharedPreferences.getInt("Theme",Color.RED); //RED is default color, when nothing is saved yet

    return theme;
}

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  int theme = loadTheme();        //Load your theme here!!!!
  CustomazationProcess.onActivityCreateSetTheme(this, theme);
  setContentView(R.layout.something1);

  findViewById(R.id.black).setOnClickListener(this);
  findViewById(R.id.yellow).setOnClickListener(this);
}