Toast抽取

import android.content.Context;
import android.widget.Toast;

/**
* 单例土司
*/

public class ToastUtils {
private static Toast toast;
public static void show(Context context,String msg){
if (toast==null) {
toast = Toast.makeText(context.getApplicationContext(), msg, Toast.LENGTH_SHORT);
}else{
toast.setText(msg);
toast.show();
}
}
}