我正在写天气应用程序,并希望在horizontalscrollview中显示每小时预测。我从我创建的一个天气类中得到一些json对象/数组的数据,这些数据是使用asynctask调用的。水平滚动视图具有线性布局(水平),因为它只能有一个孩子,然后包含多个具有两个文本视图和一个图像视图的垂直线性布局。这样,单行包含列,每列都有一个小时,温度和图标堆叠在一起,所有这些我都想以编程方式设置。一切看起来都很好,并且构建得很好,但是当我在galaxy选项卡上运行应用程序时,只有activity_main.xml布局似乎被调用,就好像它从不实现我的水平滚动视图布局。Android Studio布局未设置
这里是我的MainActivity.java的的onCreate():
public class MainActivity extends AppCompatActivity {
Context context;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
LinearLayout parentLayout = (LinearLayout) findViewById(R.id.parentLayout);
HorizontalScrollView hsv = (HorizontalScrollView) findViewById(R.id.hsvView);
LinearLayout linLay = (LinearLayout) findViewById(R.id.linLay);
//linlay.setOrientation(LinearLayout.HORIZONTAL);
//linlay.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,50dp, LinearLayout.LayoutParams.WRAP_CONTENT));
// hsv.addView(linlay);
int viewCount = 10;
final LinearLayout[] childLayout = new LinearLayout[viewCount];
final TextView[] hourText = new TextView[viewCount];
final TextView[] tempText = new TextView[viewCount];
final ImageView[] iconView = new ImageView[viewCount];
for(int i = 0; i < viewCount; i++) {
childLayout[i] = new LinearLayout(this);
childLayout[i].setOrientation(LinearLayout.VERTICAL);
//childLayout[i].setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
hourText[i] = new TextView(this);
tempText[i] = new TextView(this);
iconView[i] = new ImageView(this);
childLayout[i].addView(hourText[i]);
childLayout[i].addView(tempText[i]);
childLayout[i].addView(iconView[i]);
linLay.addView(childLayout[i]);
}
//put into separate class
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
final Button button = (Button) findViewById(R.id.button);
button.setText("Get Weather");
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//may want to listen for good network connection response first
WeatherTask WunWeather = new WeatherTask(context, childLayout,hourText,tempText,iconView, button);
WunWeather.execute();
}
});
}
}
我activity_main.xml中是获取与每一个项目创建的标准之一。我删除了浮动操作按钮,并用@ layout/horizontal_scroll替换了标准include @ layout/content_main。
这里是我的horizontal_scroll.xml布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent" android:id="@+id/parentLayout">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@+id/button_text"
android:id="@+id/button" />
<HorizontalScrollView
android:layout_width="fill_parent"
android:layout_height="50dp"
android:id="@+id/hsvView" >
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="@+id/linLay">
</LinearLayout>
</HorizontalScrollView>
</LinearLayout>
这是我的WeatherTask设置所有从收集的数据,这些意见对于所有这一切都在另一个线程。我知道,JSON数据被正确检索:
public class WeatherTask extends AsyncTask<Void, Void, Void> {
LinearLayout[] child;
TextView[] hoursView;
String[] hoursData = new String[10];
TextView[] tempsView;
String[] tempsData = new String[10];
ImageView[] iconsView;
//String[] iconsUrl = new String[10];
Bitmap[] iconsBit = new Bitmap[10];
Button button;
Context context;
JSONObject json;
JSONArray hourly;
//Bitmap icon = null;
String AM_PM = "";
/*
WeatherTast(Textview[] text, ImageView[] icons, Button button) {
}
*/
WeatherTask(Context context, LinearLayout[] child, TextView[] hours, TextView[] temps, ImageView[] icons, Button button) {
this.context = context;
this.child = child;
this.hoursView = hours;
this.tempsView = temps;
this.iconsView = icons;
this.button = button;
}
//after onpreexecute() method
//passes result to onpostexecute()
@Override
protected Void doInBackground(Void... params) {
Log.d("AsyncTask","got to doInBackground");
//goes to onpostexecute()
//need eventually call on gps class to get lat/lon from here
GetWeather weather = new GetWeather(40.693,-89.590);
json = weather.jsonWeather(); //organized by hour
Log.d("AsyncTask", String.valueOf(json));
//send json up to database
try {
//hourly = json.getJSONArray("Hourly Forecast");
for(int i=0; i<10; i++) {
JSONObject tempHour = json.getJSONArray("Hourly Forecast").getJSONObject(i);
hoursData[i] = tempHour.getString("Hour"); //get hour
tempsData[i] = tempHour.getString("Hour Temp");
iconsBit[i] = null;
InputStream in = new URL(tempHour.getString("Icon")).openStream();
iconsBit[i] = BitmapFactory.decodeStream(in);
//may want to save all images locally
}
} catch(Exception e) {
}
Calendar time = Calendar.getInstance();
int minutes = time.get(Calendar.MINUTE);
int hours = time.get(Calendar.HOUR);
if (time.get(Calendar.AM_PM) == 1) {
AM_PM = "PM";
} else {AM_PM = "AM";}
//Integer hour = currentTime.HOUR;
//Integer min = currentTime.MINUTE;
return null;
}
//first method called in asynctask with .execute() in main ui thread
@Override
protected void onPreExecute() {
//may not want to clear out latest data just in case a network connection exception is thrown
button.setText("Getting weather");
Log.d("AsyncTask", "got to preexecute");
// textView.setText("");
//imageView.setImageBitmap(null);
//return s;
}
//after finishing job, publishes result to UI thread
@Override
protected void onPostExecute(Void v) {
//super.onPostExecute(j);
//button says "weather updated @timestamp
//imageView downloads icon image last
//textView shows current temp
Log.d("AsyncTask","got to onpostExecute");
try {
//j.getString("Temperature");
Calendar time = Calendar.getInstance();
for (int i = 0; i < 10; i++) {
hoursView[i].setText(hoursData[i]);
tempsView[i].setText("Temperature: " + tempsData[i] + "\u2109");
iconsView[i].setImageBitmap(iconsBit[i]);
}
button.setText("Weather Updated at " + time.get(Calendar.HOUR) + ":" + time.get(Calendar.MINUTE)
+ " " + AM_PM);
} catch(Exception e) {
}
}
}
正如你所知道的,我是很新的应用程序。我的logcat没有任何错误,但是我的WeatherTask中没有任何log.d语句正在显示。谢谢你的帮助。我在Windows x64上使用API 23。
我认为这可能与此有关。我把你的两行无济于事。我的asynctask中的logcat标签甚至没有出现在logcat中,就好像我的应用程序甚至没有使它那么远。我需要在我的MainActivity中使用requestLayout()吗?我还需要为我的每个视图和布局执行requestLayout吗? –