[2017-7-28]Android Learning Day6

 常用控件

1. Spinner

2. DatePickerDialog

3. TimePickerDiaog

4. RadioButton

5. CheckBox

spinner（下拉菜单）

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

public class MainActivity extends AppCompatActivity {

    private Spinner s;
    private String[] dataSource = new String[]{"a1","b2","c3"};

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

        s = (Spinner) findViewById(R.id.spinner);
        //设置一个Adapter
        s.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, dataSource));
　　　　　//sOnSe                         OnIt
        s.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                //在这里写监听事件
　　　　　　　　　　　　System.out.println("用户选择的是"+dataSource[position]);
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {
　　　　　　　　　　//不写
            }
        });
    }
}

DatePickerDialog（日期选择器）

<Button
    android:id="@+id/button"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="选择日期" />

public class ChooseDate extends AppCompatActivity {

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

    public void slove() {
        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new DatePickerDialog(ChooseDate.this, new DatePickerDialog.OnDateSetListener() {
                    @Override
                    public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
                        String chooseDate = String.format("%04d-%02d-%02d",year,month+1,dayOfMonth);//"%04d"总长度4位，不够用0补齐
                        ((Button) findViewById(R.id.button)).setText(chooseDate);
                    }
                },2000,0,1).show();//要注意月份是从0~11
            }
        });
    }
}

TimePickerDialog（时间选择器）

这个就和日期选择器很像了

<Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="选择时间" />

public class ChooseTime extends AppCompatActivity {

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

    public void slove() {
        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new TimePickerDialog(ChooseTime.this, new TimePickerDialog.OnTimeSetListener() {
                    @Override
                    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                        String chooseTime = String.format("%02d:%02d",hourOfDay,minute);
                        ((Button) findViewById(R.id.button)).setText(chooseTime);
                    }
                },0,0,true).show();//True是否使用24小时制
            }
        });
    }
}

RadioButton（单选框）

这个要注意的是，单选按钮不能单独存在，要放在RadioGroup里

<?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">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_weight="1">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:textSize="18sp"
            android:text="世界上最大的海洋是？"/>

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

            <RadioButton
                android:id="@+id/rbA"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textSize="16sp"
                android:text="A.太平洋" />

            <RadioButton
                android:id="@+id/rbB"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textSize="16sp"
                android:text="B.北冰洋" />
        </RadioGroup>

    </LinearLayout>

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

</LinearLayout>

public class ChooseSingle extends AppCompatActivity {

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

    private void slove() {
        findViewById(R.id.chooseOne).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RadioButton rb = (RadioButton) findViewById(R.id.rbA);
                if(rb.isChecked()) {
                    Toast.makeText(ChooseSingle.this, "正确", Toast.LENGTH_SHORT).show();
                }
                else {
                    Toast.makeText(ChooseSingle.this, "错误", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }
}

CheckBox（多选框）

<?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:id="@+id/tv1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="你喜欢喝什么饮料？" />

    <CheckBox
        android:id="@+id/cb1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="冰峰" />

    <CheckBox
        android:id="@+id/cb2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="果啤" />

    <CheckBox
        android:id="@+id/cb3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="雪碧" />

    <TextView
        android:id="@+id/tv2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

package com.liwenchi.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private CheckBox cb1,cb2,cb3;
    private TextView tv;

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

    public void slove() {
        cb1 = (CheckBox) findViewById(R.id.cb1);
        cb2 = (CheckBox) findViewById(R.id.cb2);
        cb3 = (CheckBox) findViewById(R.id.cb3);
        tv = (TextView) findViewById(R.id.tv2);
        cb1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                onChanged();
            }
        });
        cb2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                onChanged();
            }
        });
        cb3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                onChanged();
            }
        });
    }

    public void onChanged() {
        String s = "我喜欢";
        if(cb1.isChecked()) {
            s += ","+cb1.getText();
        }
        if(cb2.isChecked()) {
            s += ","+cb2.getText();
        }
        if(cb3.isChecked()) {
            s += ","+cb3.getText();
        }
        tv.setText(s);
    }
}