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

<?xml version="1.0" encoding="utf-8"?>

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

<?xml version="1.0" encoding="utf-8"?>

运行结果：

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