第6 节 Android 常用控件.ppt

第六节：Android常用控件 zhaoshuyang@ Widget（一） 2018-2-15 zhaoshuyang@ 2 RadioGroup RadioButton CheckBox Toast ProgressBar ListView CheckBoxWidget.java 2018-2-15 zhaoshuyang@ 3 package cn.zsy.activity; import android.app.Activity; import android.os.Bundle; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.RadioButton; import android.widget.RadioGroup; import android.widget.Toast; public class CheckBoxWidget extends Activity { // 组件(Widget)对象的声明 private RadioGroup genderGroup = null; private RadioButton male = null; private RadioButton female = null; private CheckBox tour = null; private CheckBox swimming = null; private CheckBox reading = null; private CheckBox walk = null; 2018-2-15 zhaoshuyang@ 4 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // 通过控件的ID得到控件对象 genderGroup = (RadioGroup) findViewById(R.id.genderGroup); male = (RadioButton) findViewById(R.id.male); female = (RadioButton) findViewById(R.id.female); tour = (CheckBox) findViewById(R.id.tour); swimming = (CheckBox) findViewById(R.id.swimming); reading = (CheckBox) findViewById(R.id.reading); walk = (CheckBox) findViewById(R.id.walk); // 为RadioGroup控件添加监听器 genderGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { if (checkedId == male.getId()) { Toast.makeText(CheckBoxWidget.this, You are selected male, Toast.LENGTH_SHORT).show(); } else if (checkedId == female.getId()) { Toast.makeText(CheckBoxWidget.this,You are selected female,Toast.LENGTH_LONG).show(); } } }); 2018-2-15 zhaoshuyang@ 5 tour.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) { // TODO Auto-generated method stub if (isChecked) { Toast.makeText(CheckBoxWidget.this, Tour is checked!,Toast.LENGTH_SHORT).show(); }