思路
用两个Fragment来承载城市的天气数据，再在WeatherActivity中根据滑动方向加载城市信息，并将这个数据显示在另一个切换出来的Fragment上。
代码
一、如何让两个Fragment的状态栏透明
如果用《第一行代码中》中的方法，会出现最先被add的Fragment状态栏透明，但后add的Fragment的状态栏却消失的情况。
解决方法就是先将系统的状态栏消失，再自己为Fragment的布局用View写个状态栏并设为透明，然后获取手机状态栏的高度，动态设置View的高度，就完成了。
1、系统状态栏消失
if(Build.VERSION.SDK_INT>=21){//如果版本号大于或等于21
View decorView=getWindow().getDecorView();
decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
|View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
getWindow().setStatusBarColor(Color.TRANSPARENT);
}
2、将View设置为状态栏
3、获取手机状态栏的高度
public class WindowAttr {
public static int getStateBarHeight(Activity a) {
int result = 0;
int resourceId = a.getResources().getIdentifier("status_bar_height",
"dimen", "android");
if (resourceId > 0) {
result = a.getResources().getDimensionPixelSize(resourceId);
}
return result;
}
}
4、动态设置View的高度
view_statusBar=(View)view.findViewById(R.id.view_statusBar);
view_statusBar.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, WindowAttr.getStateBarHeight(getActivity())));
二、WeatherFragment：
1、两个Fragment除了名字完全一致，都用于显示城市的天气信息。
public void showWeatherInfo(Weather weather){
String cityName=weather.basic.cityName;
String updateTime=weather.basic.update.updateTime.split(" ")[1];
String degree=weather.now.temperature+"℃";
String weatherInfo=weather.now.more.info;
titleCity.setText(cityName);
titleUpdateTime.setText(updateTime);
degreeText.setText(degree);
weatherInfoText.setText(weatherInfo);
forecastLayout.removeAllViews();
for(Forecast forecast:weather.forecastList){//将forecastLayout的子项forecast_item加载进去
View view= LayoutInflater.from(getActivity()).inflate(R.layout.forecast_item,forecastLayout,false);
TextView dateText=(TextView)view.findViewById(R.id.date_text);
TextView infoText=(TextView)view.findViewById(R.id.info_text);
TextView maxText=(TextView)view.findViewById(R.id.max_text);
TextView minText=(TextView)view.findViewById(R.id.min_text);
dateText.setText(forecast.date);
infoText.setText(forecast.more.info);
maxText.setText(forecast.temperature.max+"℃");
minText.setText(forecast.temperature.min+"℃");
forecastLayout.addView(view);
}
if(weather.aqi!=null){
aqiText.setText(weather.aqi.city.aqi);
pm25Text.setText(weather.aqi.city.pm25);
}
String comfort="舒适度："+weather.suggestion.comfort.info;
String carWash="洗车指数："+weather.suggestion.carWash.info;
String sport="运动建议："+weather.suggestion.sport.info;
comfortText.setText(comfort);
carWashText.setText(carWash);
sportText.setText(sport);
weatherLayout.setVisibility(View.VISIBLE);
}
2、切换Fragment时，被hide的WeatherFragment需要被置顶，但切换是有动画效果的，置顶的操作不能在切换时被发现，所以我延迟了500ms执行置顶效果。
public void onHiddenChanged(boolean hidden) {
super.onHiddenChanged(hidden);
if(hidden){
/*延时500毫秒*/
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
weatherLayout.smoothScrollTo(0,0);//将fragment置顶
}
}, 500);
}else {
}
}
3、在WeatherActivity初始化Fragment，先隐藏FragmentTwo，显示FragmentOne。
private void initFragment(){
fragmentOne=new WeatherFragmentOne();
fragmentTwo=new WeatherFragmentTwo();
transaction=getSupportFragmentManager().beginTransaction();
transaction.add(R.id.framelayout_weather,fragmentOne);
transaction.add(R.id.framelayout_weather,fragmentTwo);
transaction.hide(fragmentTwo);
transaction.commit();
}
三、onStart()
因为从WeatherAddActivity退回到WeatherActivity后，城市信息会有变化，所以我把获取城市数据和显示城市天气信息的操作都挪到了onStart()中进行。
1、获取数据和显示信息，并得到数据库中城市的数量weatherNum，及当前要显示数据库中第几个城市的信息defNum。
private void showFragment(){
List countyAdditions= DataSupport.findAll(County_Addition.class);
for(County_Addition countyAddition:countyAdditions){
weatherNum++;
if(countyAddition.getDef()==true)
defNum=weatherNum;
requestWeather(countyAddition.getCountyWeatherId(),countyAddition,STATE);
}
}
public void requestWeather(final String weatherId, final County_Addition county_addition,final int frag_state){
String weatherUrl="http://guolin.tech/api/weather?cityid="+weatherId+
"&key=63660528a9dc4f968243a7f0669cbe26";
HttpUtil.sendOkHttpRequest(weatherUrl, new Callback() {
@Override
public void onResponse(Call call, Response response) throws IOException {
final String responseText=response.body().string();
final Weather weather=Utility.handleWeatherResponse(responseText);
runOnUiThread(new Runnable() {
@Override
public void run() {
if(weather!=null&&"ok".equals(weather.status)){
county_addition.setCountyWeather(responseText);
county_addition.save();
if(county_addition.getDef()==true){
if(frag_state==1)
fragmentOne.showWeatherInfo(weather);
else if(frag_state==2)
fragmentTwo.showWeatherInfo(weather);
}
}else {
Toast.makeText(WeatherActivity.this,"获取天气信息失败",Toast.LENGTH_SHORT).show();
}
}
});
}
public void onFailure(Call call, IOException e){
e.printStackTrace();
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(WeatherActivity.this,"获取天气信息失败",Toast.LENGTH_SHORT).show();
}
});
}
});
}
2、根据手指触控事件切换城市。一开始我用的onTouchEvent来判断左右滑动指示，但因为我的Fragment界面用到了ScrollView，所以自己写的onToucheEvent不能触发，大概是被ScrollView消费了，之后改成dispatchTouchEvent居然就解决了！！！
public boolean dispatchTouchEvent(MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_DOWN){
x1=event.getX();
}
if(event.getAction()==MotionEvent.ACTION_UP){
x2=event.getX();
if(x2-x1>100){
changeFragment(LEFT);
}else if(x1-x2>100){
changeFragment(RIGHT);
}
}
return super.dispatchTouchEvent(event);
}
3、Fragment切换操作
private void changeFragment(int lr){
transaction=getSupportFragmentManager().beginTransaction();
if(lr==RIGHT){
transaction.setCustomAnimations(R.anim.push_left_in,R.anim.push_left_out);
if(defNum1){
defNum--;
showFragment(transaction,defNum);
}
}
transaction.commit();
}
private void showFragment(FragmentTransaction transaction,int num){
int i=0;
if(STATE==1){
transaction.hide(fragmentOne);
transaction.show(fragmentTwo);
List countyAdditions= DataSupport.findAll(County_Addition.class);
for(County_Addition countyAddition:countyAdditions){
i++;
if(i==num){
fragmentTwo.showWeatherInfo(Utility.handleWeatherResponse(countyAddition.getCountyWeather()));
break;
}
}
STATE=2;
}else if(STATE==2){
transaction.hide(fragmentTwo);
List countyAdditions= DataSupport.findAll(County_Addition.class);
for(County_Addition countyAddition:countyAdditions){
i++;
if(i==num){
fragmentOne.showWeatherInfo(Utility.handleWeatherResponse(countyAddition.getCountyWeather()));
break;
}
}
transaction.show(fragmentOne);
STATE=1;
}
}
源码
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