安卓开发

1.获取用户名

package com.example.myapplication;


import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;


public class MyApplication extends AppCompatActivity {
private  EditText st;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btn=findViewById(R.id.button2);
        st= findViewById(R.id.editText3);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String text=st.getText().toString();
                Log.e("leo","内容"+text);
            }
        });
    }
}