【Android】33.下拉菜单、单选多选按钮、时间日期选择器的使用

33.下拉菜单、单选多选按钮、时间日期选择器的使用

1.下载素材。

本节素材源码，请在公众号回复" AS12171 "。

2.修改activity_main.xml。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Spinner
        android:id="@+id/spinner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="日期选择器" />

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="时间选择器" />

    <RadioGroup
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <RadioButton
            android:id="@+id/radioButton1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="RadioButton1" />

        <RadioButton
            android:id="@+id/radioButton2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="RadioButton2" />

        <RadioButton
            android:id="@+id/radioButton3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="RadioButton3" />
    RadioGroup>

    <CheckBox
        android:id="@+id/checkBox1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="CheckBox1" />

    <CheckBox
        android:id="@+id/checkBox2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="CheckBox2" />

    <CheckBox
        android:id="@+id/checkBox3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="CheckBox3" />


LinearLayout>

3.修改MainActivity。

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener, View.OnClickListener, CompoundButton.OnCheckedChangeListener {

    private Spinner spinner;
    private Button button1;
    private Button button2;
    private RadioButton radioButton1;
    private RadioButton radioButton2;
    private RadioButton radioButton3;
    private CheckBox checkBox1;
    private CheckBox checkBox2;
    private CheckBox checkBox3;
    private String[] list= new String[]{"下拉选项1","下拉选项2","下拉选项3","下拉选项4"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        spinner = findViewById(R.id.spinner);
        button1 = findViewById(R.id.button1);
        button2 = findViewById(R.id.button2);
        radioButton1 = findViewById(R.id.radioButton1);
        radioButton2 = findViewById(R.id.radioButton2);
        radioButton3 = findViewById(R.id.radioButton3);
        checkBox1 = findViewById(R.id.checkBox1);
        checkBox2 = findViewById(R.id.checkBox2);
        checkBox3 = findViewById(R.id.checkBox3);

        spinner.setOnItemSelectedListener(this);
        button1.setOnClickListener(this);
        button2.setOnClickListener(this);
        radioButton1.setOnClickListener(this);
        radioButton2.setOnClickListener(this);
        radioButton3.setOnClickListener(this);
        checkBox1.setOnCheckedChangeListener(this);
        checkBox2.setOnCheckedChangeListener(this);
        checkBox3.setOnCheckedChangeListener(this);

        spinner.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,list));
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        Toast.makeText(this, "当前选中的是"+list[position], Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.button1:
                new DatePickerDialog(MainActivity.this, new DatePickerDialog.OnDateSetListener() {
                    @Override
                    public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
                        Toast.makeText(MainActivity.this, "当前选择的时间是："+year+month+dayOfMonth, Toast.LENGTH_SHORT).show();
                    }
                },2019,12,7).show();
                break;

            case R.id.button2:
                new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() {
                    @Override
                    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                        Toast.makeText(MainActivity.this, "当前选择的时间是："+hourOfDay+minute, Toast.LENGTH_SHORT).show();
                    }
                },00,00,true).show();
                break;
            case R.id.radioButton1:
                Toast.makeText(this, "当前选中的是"+radioButton1.getText(), Toast.LENGTH_SHORT).show();
                break;
            case R.id.radioButton2:
                Toast.makeText(this, "当前选中的是"+radioButton2.getText(), Toast.LENGTH_SHORT).show();
                break;
            case R.id.radioButton3:
                Toast.makeText(this, "当前选中的是"+radioButton3.getText(), Toast.LENGTH_SHORT).show();
                break;
        }
    }

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        StringBuffer sb = new StringBuffer();
        if (checkBox1.isChecked()) {
            sb.append(checkBox1.getText());
        }
        if (checkBox2.isChecked()) {
            sb.append(checkBox2.getText());
        }
        if (checkBox3.isChecked()) {
            sb.append(checkBox3.getText());
        }
        Toast.makeText(this, "当前选中的是"+sb.toString(), Toast.LENGTH_SHORT).show();
    }
}

4.效果图。