package com.example.childguard; import android.graphics.Color; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.widget.TextView; import androidx.appcompat.app.AppCompatActivity; public class QR extends AppCompatActivity { String get_on="乗車状態"; String get_off ="降車状態"; TextView tv=findViewById(R.id.situation); @Override protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.fragment_qr); findViewById(R.id.camera).setOnClickListener( v -> { if(get_on.equals(tv.getText().toString())){ tv.setText(get_off); findViewById(R.id.situation_bg).setBackgroundColor(Color.parseColor("#dcdcdc")); } else { tv.setText(get_on); findViewById(R.id.situation_bg).setBackgroundColor(Color.parseColor("#ff4500")); } } ); } }