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);
    }
}