问题描述
当我在android studio应用上运行此代码时出现问题。
打包com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
public class FirstScreen extends AppCompatActivity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
TextView textView = findViewById(R.id.newScreen);
String value ;
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_first_screen);
Intent intent = getIntent();
value=intent.getStringExtra("Sending");
textView.setText(value);
}
}
解决方法
TextView textView = findViewById(R.id.newScreen);
应该在setContentView(R.layout.activity_first_screen);
之后