我是新手/正在学习 Java 和 Android，并尝试制作一个简单的天气应用程序来告诉我当前位置的天气。我已经掌握了基础知识，并且正在使用 OpenWeatherMap API - 一切都很好。
我正在尝试执行以下操作: - 当API返回给我天气信息时，例如“碎云”或“大雨”，我想将ImageView设置为一张图片，例如碎云或大雨。
我似乎无法让 ImageView 获取图像(位于我的 Drawable 文件夹中) - 我尝试过使用 setImageResource、setImageDrawable 等。有什么指点吗？我错过了什么？
这是我的代码(重要的部分):
public class DownloadHtml extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
String result = "";
URL url;
HttpURLConnection urlConnection;
try {
url = new URL(urls[0]);
urlConnection = (HttpURLConnection) url.openConnection();
InputStream in = urlConnection.getInputStream();
InputStreamReader reader = new InputStreamReader(in);
int data = reader.read();
while (data != -1) {
char current = (char) data;
result += current;
data = reader.read();
}
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
try {
JSONObject jsonObject = new JSONObject(result);
String weatherInfo = jsonObject.getString("weather");
String tempInfo = jsonObject.getJSONObject("main").getString("temp");
String windInfo = jsonObject.getJSONObject("wind").getString("deg");
JSONArray weatherArr = new JSONArray(weatherInfo);
for (int i = 0; i < weatherArr.length(); i++) {
TextView weatherTextView = findViewById(R.id.weatherTextView);
weatherTextView.setText("");
JSONObject jsonPart = weatherArr.getJSONObject(i);
String description = jsonPart.getString("description");
weatherTextView.setText(description);
iv = findViewById(R.id.imageView2);
if (description == "clear sky") iv.setImageResource(R.drawable.clear_skies);
else if (description == "few clouds")
iv.setImageResource(R.drawable.few_clouds);
else if (description == "scattered clouds")
iv.setImageResource(R.drawable.scattered_clouds);
else if (description == "broken clouds")
iv.setImageResource(R.drawable.broken_clouds);
else if (description == "shower rain")
iv.setImageResource(R.drawable.shower_rain);
else if (description == "rain") iv.setImageResource(R.drawable.heavy_rain);
else if (description == "thunderstorm")
iv.setImageResource(R.drawable.thunderstorm);
else if (description == "snow") iv.setImageResource(R.drawable.snow);
else if (description == "mist") iv.setImageResource(R.drawable.mist);
Log.i("description", jsonPart.getString("description"));
if (description != null) {
locationManager.removeUpdates(locationListener);
}
}
for (int f = 0; f < tempInfo.length(); f++) {
TextView weatherTextView3 = findViewById(R.id.weatherTextView3);
weatherTextView3.setText("");
String tempString = tempInfo + " degrees celcius.\n";
weatherTextView3.setText(tempString);
Log.i("temp: ", tempInfo);
if (tempString != null) {
locationManager.removeUpdates(locationListener);
f = 500;
}
}
for (int j = 0; j < windInfo.length(); j++) {
TextView weatherTextView2 = findViewById(R.id.weatherTextView2);
weatherTextView2.setText("");
// assign text to wind direction
double windDegrees = Double.valueOf(windInfo);
if ((windDegrees > 0) && (windDegrees < 90)) {
String windString = "A North East Wind.\n";
weatherTextView2.setText(windString);
Log.i("Wind: ", windInfo);
}
if ((windDegrees >= 90) && (windDegrees < 180)) {
String windString = "A South East Wind.\n";
weatherTextView2.append(windString);
Log.i("Wind: ", windInfo);
}
if ((windDegrees >= 180) && (windDegrees < 270)) {
String windString = "A South West Wind.\n";
weatherTextView2.append(windString);
Log.i("Wind: ", windInfo);
}
if ((windDegrees >= 270) && (windDegrees < 360)) {
String windString = "A North West Wind.\n";
weatherTextView2.append(windString);
Log.i("Wind: ", windInfo);
}
if (windInfo != null) {
locationManager.removeUpdates(locationListener);
j = 500;
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
最佳答案
您只是不小心使用了 == 来比较字符串:)
使用description.equals("clear sky")代替description == "clear sky"
关于java - 我可以在 onPostexecute 中使用 setImageResource 吗？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48510764/