Java 在android中创建一个自定义函数，这样我就可以随时随地使用它

我创建了一个java类，但我认为如果不是针对

getLayoutInflator（）

和

getApplicationContext（）

我该怎么解决这是我的问题

public final class CustomFunctions {
    /**
     * Private constructor to prevent instantiation
     */
    private CustomFunctions() {}

    public static void customToast(String msg){
        /*Custom Toast Message*/
        LayoutInflater inflater = getLayoutInflater();
        View layout = inflater.inflate(R.layout.toast,
                (ViewGroup) findViewById(R.id.toast_layout_root));


        TextView text = (TextView) layout.findViewById(R.id.text);
        text.setText(msg);
        Button btnDismiss = (Button) layout.findViewById(R.id.btndismiss);
        final Toast toast = new Toast(getApplicationContext());


        toast.setDuration(Toast.LENGTH_LONG);
        toast.setView(layout);
        toast.show();
        hideDialog();
        btnDismiss.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                toast.cancel();
            }
        });
        /*Custom Toast Message*/
    }
}

---

如果我很理解您的问题，那么您确实需要将上下文作为参数传递给类或函数。你可以这样称呼它

CustomFunctions.customToast(getApplicationContext(),"This is Toast message");


public final class CustomFunctions {
/**
 * Private constructor to prevent instantiation
 */
private CustomFunctions() {}

public static void customToast(Context context,String msg){
    /*Custom Toast Message*/
    LayoutInflater inflater = LayoutInflater.from(context);**//get inflater service from context**
    View layout = inflater.inflate(R.layout.toast,
            (ViewGroup) findViewById(R.id.toast_layout_root));


    TextView text = (TextView) layout.findViewById(R.id.text);
    text.setText(msg);
    Button btnDismiss = (Button) layout.findViewById(R.id.btndismiss);
    final Toast toast = new Toast(context);**//pass context**


    toast.setDuration(Toast.LENGTH_LONG);
    toast.setView(layout);
    toast.show();
    hideDialog();
    btnDismiss.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            toast.cancel();
        }
    });
    /*Custom Toast Message*/
}

---

}

只需将上下文传递给类，就可以使用

getLayoutInflator

和

getApplicationContext

这很好，但是

findViewById

仍然是红色错误消息是

无法解析方法findViewById

将viewgroup作为参数传递给与上下文相同的函数。ViewGroup ViewGroup=（ViewGroup）findViewById（R.id.toast\u layout\u root）；然后调用customToast（上下文，视图组，“您的消息”）；检查是否有蛇行可能是你需要的