学习安卓第四天

package com.example.demo;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
static RadioGroup rg;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        rg=findViewById(R.id.a);
        rg.setonCheckedChangeListener(new RadioGroup.onCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup radioGroup, int i) {
                RadioButton rb=findViewById(i);
                Toast.makeText(MainActivity.this, "性别"+rb.getText(), Toast.LENGTH_SHORT).show();
            }
        });
        Button button=findViewById(R.id.button1);
        button.setonClickListener(new View.onClickListener() {
            @Override
            public void onClick(View view) {
           for(int i=0;i 


    


    

    
 
 
 
 
 
今天大概就学了，按钮的显示：
 
方式一：
 
Button button=findViewById(R.id.button1);
 
button1.setonClickListener(new View.onClickListener(){
 
@Override
 
public void onClick(View v){
 
Toast.makeText(MainActivity.this,"输入显示的内容",Toast.LENGTH_SHORT).show();
 
}
 
});
 
方式二：
 
public void myClick(View v){
 
Toast.makeText(MainActivity.this,"",Toast.LENGTH_LONG).show();
 
}