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"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:baselineAligned="false"
android:orientation="vertical"
android:weightSum="1">
<CheckBox
android:id="@+id/plain_cb"
android:text="Plain"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<CheckBox
android:id="@+id/serif_cb"
android:text="Serif"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<CheckBox
android:id="@+id/bold_cb"
android:text="bold"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<CheckBox
android:id="@+id/italic_cb"
android:text="Italic"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="@+id/get_view_button"
android:text="获取CheckBox的值"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

</LinearLayout>

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"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:baselineAligned="true"
android:orientation="vertical"
android:weightSum="1">
<RadioGroup
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<RadioButton
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/rb1"
android:text="AAA"/>
<RadioButton
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/rb2"
android:text="BBB"/>
<RadioButton
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/rb3"
android:text="CCC"/>
</RadioGroup>
</LinearLayout>


运行结果：