学习安卓开发第五天

package com.example.question;

import androidx.appcompat.app.alertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.text.AlteredCharSequence;
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 {
RadioGroup rg;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button=findViewById(R.id.bt);
        rg=findViewById(R.id.rg);
        button.setonClickListener(new View.onClickListener() {
            @Override
            public void onClick(View view) {
                for (int i=0;i 
 
以上是java代码
 
下面这个是xml代码
 



    
    
        
        
        
        

    

 
结果显示图为
 
 
 
 
 
package com.example.deme;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
CheckBox like1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        like1=findViewById(R.id.like1);

        like1.setonCheckedChangeListener(new CompoundButton.onCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if(like1.isChecked()){

    Toast.makeText(MainActivity.this, like1.getText(), Toast.LENGTH_SHORT).show();
}
            }
        });
    }
}
 



   
    
    

 
效果图：
 
 
 


    

    
    
    
    
    
    

 
package com.example.abcde;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
Button btn_login;
CheckBox checkBox1,checkBox2,checkBox3;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btn_login=findViewById(R.id.btn_login);
        checkBox1=findViewById(R.id.checkbox1);
        checkBox2=findViewById(R.id.checkbox2);
        checkBox3=findViewById(R.id.checkbox3);
        btn_login.setonClickListener(new View.onClickListener() {
            @Override
            public void onClick(View view) {
                String checked="";
                if(checkBox1.isChecked()){
                    checked+=checkBox1.getText().toString();


                }
                if(checkBox2.isChecked()){
                   checked+=checkBox2.getText().toString();
                }
                if (checkBox3.isChecked()){
                    checked+=checkBox3.getText().toString();
                }
                Toast.makeText(MainActivity.this, checked, Toast.LENGTH_LONG).show();
            }
        });


    }
}
 
 
 
 
上面都是复选框的实例