Android开发UI之常用控件的使用

1.日期选择控件

DatePickerDialog

代码：

         btnChooseDate=(Button) findViewById(R.id.btnChooseDate);
         btnChooseDate.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 // TODO Auto-generated method stub
                 new DatePickerDialog(MainActivity.this, new DatePickerDialog.OnDateSetListener() {

                     @Override
                     public void onDateSet(DatePicker view, int year, int monthOfYear,
                             int dayOfMonth) {
                         // TODO Auto-generated method stub
                         String theDate=String.format("%d-%d-%d", year,monthOfYear+1,dayOfMonth);
                         btnChooseDate.setText(theDate);
                     }
                 }, 2015, 06, 16).show();
             }
         });

2.时间选择控件

TimePickerDialog

 btnChooseTime=(Button) findViewById(R.id.btnChooseTime);
         btnChooseTime.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 // TODO Auto-generated method stub
                 new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() {

                     @Override
                     public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                         // TODO Auto-generated method stub
                         String time=String.format("%d-%d", hourOfDay,minute);
                         btnChooseTime.setText(time);
                     }
                 }, 0, 0, true).show();
             }
         });

3.下拉选择列表

Spinner

 spinner=(Spinner) findViewById(R.id.spinner1);
         spinner.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,data));
         spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

             @Override
             public void onItemSelected(AdapterView<?> parent, View view,
                     int position, long id) {
                 // TODO Auto-generated method stub
                 Toast.makeText(MainActivity.this, "点击了"+data[position], Toast.LENGTH_SHORT).show();
             }

             @Override
             public void onNothingSelected(AdapterView<?> parent) {
                 // TODO Auto-generated method stub

             }
         });

4.单选按钮

RadioButton

注意：在XML文件中，必须使用RadioGroup控件，才可以使用RadioButton。

在JAVA文件中，判断RadioButton是否被点击，使用方法isChecked()。

资源文件

 <?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:orientation="vertical" >
     <TextView android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="世界上最大的海洋？"/>

     <RadioGroup android:id="@+id/radioGroup"
         android:layout_width="match_parent"
         android:layout_height="wrap_content">
         <RadioButton android:id="@+id/rdA"
             android:text="A.太平洋"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"/>
         <RadioButton android:id="@+id/rdB"
             android:text="B.印度洋"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"/>
         <RadioButton android:id="@+id/rdC"
             android:text="C.大西洋"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"/>
         <RadioButton android:id="@+id/rdD"
             android:text="D.喜洋洋"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"/>
     </RadioGroup>

     <Button android:id="@+id/btnSubmit"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="提交"/>

 </LinearLayout>

JAVA

 public class SingleChoose extends Activity {

     private Button btnSubmit;
     private RadioButton rdA;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         // TODO Auto-generated method stub
         super.onCreate(savedInstanceState);
         setContentView(R.layout.singlechoose);
         btnSubmit=(Button) findViewById(R.id.btnSubmit);
         rdA=(RadioButton) findViewById(R.id.rdA);
         btnSubmit.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 // TODO Auto-generated method stub
                 if (rdA.isChecked()) {
                     Toast.makeText(SingleChoose.this, "答案是正确的", Toast.LENGTH_SHORT).show();
                 }
                 else {
                     Toast.makeText(SingleChoose.this, "答案是错误的", Toast.LENGTH_SHORT).show();
                 }
             }
         });
     }

 }

5.多选

Checkbox

资源文件：

 <?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:orientation="vertical" >
     <TextView android:text="请选择你喜欢的事物"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"/>
     <CheckBox android:id="@+id/cb1"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="肉夹馍"/>
     <CheckBox android:id="@+id/cb2"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="蛋炒饭"/>
     <CheckBox android:id="@+id/cb3"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="鸡蛋面"/>
     <CheckBox android:id="@+id/cb4"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="鸡米饭"/>
     <TextView android:id="@+id/showResult"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"/>
 </LinearLayout>

JAVA文件

 public class MlutilChoose extends Activity implements OnCheckedChangeListener {

     private CheckBox cb1,cb2,cb3,cb4;
     private TextView showResult;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         // TODO Auto-generated method stub
         super.onCreate(savedInstanceState);
         setContentView(R.layout.mlutichoose);
         cb1=(CheckBox) findViewById(R.id.cb1);
         cb2=(CheckBox) findViewById(R.id.cb2);
         cb3=(CheckBox) findViewById(R.id.cb3);
         cb4=(CheckBox) findViewById(R.id.cb4);
         showResult=(TextView) findViewById(R.id.showResult);
         cb1.setOnCheckedChangeListener(this);
         cb2.setOnCheckedChangeListener(this);
         cb3.setOnCheckedChangeListener(this);
         cb4.setOnCheckedChangeListener(this);
     }
     @Override
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
         // TODO Auto-generated method stub
         String str="你喜欢";
         if (cb1.isChecked()) {
             str+=cb1.getText().toString()+",";
         }
         if (cb2.isChecked()) {
             str+=cb2.getText().toString()+",";
         }
         if (cb3.isChecked()) {
             str+=cb3.getText().toString()+",";
         }
         if (cb4.isChecked()) {
             str+=cb4.getText().toString();
         }

         showResult.setText(str);
     }
 }