如何从HomeScreen小部件中调用Activity中的函数

public void myFunction() {
    // 在这里编写你的代码逻辑
}

Intent intent = new Intent(context, YourActivity.class);
intent.setAction("com.example.ACTION_CALL_FUNCTION"); // 自定义的Action
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);

RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.your_widget_layout);
views.setOnClickPendingIntent(R.id.your_button_id, pendingIntent);

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.your_activity_layout);

    Intent intent = getIntent();
    if (intent.getAction().equals("com.example.ACTION_CALL_FUNCTION")) {
        myFunction(); // 调用你的函数
    }
}