做一款自己的安卓天气闹钟（3）——用Switch控制元素的显示隐藏

先看界面

image.png

知识点

1. include标签
   include标签是为了方便界面的复用，比如今天的界面最上边的界面明显是第一篇中的布局文件，我们可以直接把它用include引用过来，而不必再重新写一次布局
2. Switch(开关)
   很简单，就是一个开关按钮，也没有太多的知识点
3. Spinner(列表选项框)
   这是一个下拉菜单，也比较简单
4. visibility（显示隐藏属性）
   VISIBLE：设置控件可见
   INVISIBLE：设置控件不可见
   GONE：设置控件隐藏
   而INVISIBLE和GONE的主要区别是：当控件visibility属性为INVISIBLE时，界面保留了view控件所占有的空间；而控件属性为GONE时，界面则不保留view控件所占有的空间

开始写代码

1. 界面文件config_show.xml

很简单的布局文件，暂时没有把相同的属性提取到style文件中，等时间充裕了再来修改
将每个switch都设置为默认选中状态

android:checked="true"

2. 给content_main.xml中相关的标签绑定id，好通过switch控制显示与否

3. 创建show.java，用来当现实设置页

package love.xzjs.t_android;

import android.content.res.Resources;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CompoundButton;
import android.widget.LinearLayout;
import android.widget.Switch;
import android.widget.TextView;



public class Show extends Fragment implements CompoundButton.OnCheckedChangeListener {
    private TextView textViewTime, textViewDate, textViewWeek;
    private LinearLayout linearLayout1,linearLayout2,linearLayout3;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.config_show, container, false);

        textViewTime = (TextView) view.findViewById(R.id.time_label);
        textViewDate = (TextView)view.findViewById(R.id.date);
        textViewWeek = (TextView)view.findViewById(R.id.week);
        linearLayout1=(LinearLayout)view.findViewById(R.id.weather_today);
        linearLayout2=(LinearLayout)view.findViewById(R.id.weather_tomorrow);
        linearLayout3=(LinearLayout)view.findViewById(R.id.weather_after_tomorrow);

        //根据屏幕宽度确定字体的大小
        Resources resources = this.getResources();
        DisplayMetrics dm = resources.getDisplayMetrics();
        int width = dm.widthPixels;
        textViewTime.setTextSize(TypedValue.COMPLEX_UNIT_SP, 150 * width / 1794);

        //绑定switch事件
        Switch switchTime = (Switch) view.findViewById(R.id.switch_time);
        Switch switchDate = (Switch) view.findViewById(R.id.switch_date);
        Switch switchWeek = (Switch) view.findViewById(R.id.switch_week);
        Switch switchWeather1=(Switch)view.findViewById(R.id.switch_weather1);
        Switch switchWeather2=(Switch)view.findViewById(R.id.switch_weather2);
        Switch switchWeather3=(Switch)view.findViewById(R.id.switch_weather3);
        switchTime.setOnCheckedChangeListener(this);
        switchDate.setOnCheckedChangeListener(this);
        switchWeek.setOnCheckedChangeListener(this);
        switchWeather1.setOnCheckedChangeListener(this);
        switchWeather2.setOnCheckedChangeListener(this);
        switchWeather3.setOnCheckedChangeListener(this);

        return view;
    }

    /**
     * 重写switch状态变更事件
     * @param compoundButton
     * @param b
     */
    @Override
    public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
        switch (compoundButton.getId()) {
            case R.id.switch_time:
                textViewTime.setVisibility(compoundButton.isChecked()?View.VISIBLE:View.GONE);
                break;
            case R.id.switch_date:
                textViewDate.setVisibility(compoundButton.isChecked()?View.VISIBLE:View.GONE);
                break;
            case R.id.switch_week:
                textViewWeek.setVisibility(compoundButton.isChecked()?View.VISIBLE:View.GONE);
                break;
            case R.id.switch_weather1:
                linearLayout1.setVisibility(compoundButton.isChecked()?View.VISIBLE:View.GONE);
                break;
            case R.id.switch_weather2:
                linearLayout2.setVisibility(compoundButton.isChecked()?View.VISIBLE:View.GONE);
                break;
            case R.id.switch_weather3:
                linearLayout3.setVisibility(compoundButton.isChecked()?View.VISIBLE:View.GONE);
                break;
        }
    }
}

结果演示

deo.gif

代码地址

https://github.com/xzjs/t_android