Android—复选框和单选框使用

.java文件

package com.example.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private CheckBox plain_cb;
    private CheckBox serif_cb;
    private CheckBox bold_cb;
    private CheckBox italic_cb;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("CheckBoxActivity");
        find_and_modify_text_view();
    }
    private void find_and_modify_text_view(){
        plain_cb=(CheckBox)findViewById(R.id.plain_cb);
        serif_cb=(CheckBox)findViewById(R.id.serif_cb);
        bold_cb=(CheckBox)findViewById(R.id.bold_cb);
        italic_cb=(CheckBox)findViewById(R.id.italic_cb);
        Button get_view_button=(Button)findViewById(R.id.get_view_button);
        get_view_button.setOnClickListener(get_view_button_listener);
    }
    private Button.OnClickListener get_view_button_listener=new Button.OnClickListener() {
        public void onClick(View v) {
            String r = "";
            if (plain_cb.isChecked()) {
                r = r + "," + plain_cb.getText();
            }
            if (serif_cb.isChecked()) {
                r = r + "," + serif_cb.getText();
            }
            if (bold_cb.isChecked()) {
                r = r + "," + bold_cb.getText();
            }
            if (italic_cb.isChecked()) {
                r = r + "," + italic_cb.getText();
            }
            setTitle("Checked: " + r);
        }
    };
}

.xml文件

运行结果：

.java文件

package com.example.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.CompoundButton;
import android.widget.RadioButton;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private RadioButton rb_1,rb_2,rb_3;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        rb_1=(RadioButton)findViewById(R.id.rb1);
        rb_2=(RadioButton)findViewById(R.id.rb2);
        rb_3=(RadioButton)findViewById(R.id.rb3);
        rb_1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
            @Override
        public void onCheckedChanged(CompoundButton buttonView,boolean isChecked){
                Toast.makeText(MainActivity.this,"AAA is Checked="+isChecked,Toast.LENGTH_SHORT).show();
            }
        });
        rb_2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
            @Override
            public void onCheckedChanged(CompoundButton buttonView,boolean isChecked){
                Toast.makeText(MainActivity.this,"BBB is Checked="+isChecked,Toast.LENGTH_SHORT).show();
            }
        });
        rb_3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
            @Override
            public void onCheckedChanged(CompoundButton buttonView,boolean isChecked){
                Toast.makeText(MainActivity.this,"CCC is Checked="+isChecked,Toast.LENGTH_SHORT).show();
            }
        });
    }

}

.xml文件

运行结果：