package com.example.radiobutton_01;

import android.app.Activity;

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 MyActivity extends Activity {

    private RadioGroup rg;

    private Button btn;

    /**

     * Called when the activity is first created.

     */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        rg = (RadioGroup)findViewById(R.id.rg);

        btn = (Button)findViewById(R.id.btn);

        btn.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View view) {

                int len = rg.getChildCount();

                String msg = "";

                for(int i=0;i<len;i++) {

                    RadioButton rb = (RadioButton)rg.getChildAt(i);

                    if(rb.isChecked()) {

                        msg = rb.getText().toString();

                        break;

                    }

                }

                Toast.makeText(MyActivity.this,msg,Toast.LENGTH_SHORT).show();

            }

        });

    }

}

package com.example.checkbox_01;

import android.app.Activity;

import android.app.AlertDialog;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.CheckBox;

import android.widget.LinearLayout;

import java.util.ArrayList;

import java.util.List;

public class MyActivity extends Activity implements View.OnClickListener{

    private List<CheckBox> checkBoxes = new ArrayList<CheckBox>();

    /**

     * Called when the activity is first created.

     */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        //setContentView(R.layout.main);

        String[] checkBoxText = new String[]{

            "are you student?

","are you love android?","are you dev?"

        };

        LinearLayout linearLayout = (LinearLayout)getLayoutInflater().inflate(R.layout.main,null);

        for(int i=0;i<checkBoxText.length;i++) {

            CheckBox checkBox = (CheckBox)getLayoutInflater().inflate(R.layout.checkbox,null);

            checkBox.setText(checkBoxText[i]);

            checkBoxes.add(checkBox);

            linearLayout.addView(checkBox,i);

        }

        setContentView(linearLayout);

        Button btn = (Button)findViewById(R.id.btn);

        btn.setOnClickListener(this);

    }

    @Override

    public void onClick(View view) {

        String s = "";

        for(CheckBox cb : checkBoxes) {

            if(cb.isChecked()) {

                s+=cb.getText() + "\n";

            }

        }

        if("".equals(s)) {

            s = "你没有选择选项";

        }

        new AlertDialog.Builder(this).setMessage(s).setPositiveButton("关闭",null).show();

    }

}