我正在尝试创建一个简单的函数，可以从邮政编码中找到信息。在下面提供的代码中，如果我输入有效的邮政编码，它将完全有效。但是当我输入错误的邮政编码时问题就开始了。我尝试使用语句try catch但不是显示错误完整的应用程序崩溃。我还想知道如何仅在英国限制搜索。通过邮政编码寻找地址是否有更好的选择，而不是使用getfromlocationName函数。
public void finder(String query){
Geocoder geocoder;
List<Address> addresses = new ArrayList<Address>();
geocoder = new Geocoder(this, Locale.getDefault());
try {
//addresses = geocoder.getFromLocation(51.283973, 1.064928, 1); // Here 1 represent max location result to returned, by documents it recommended 1 to 5
addresses = geocoder.getFromLocationName(query,1);
} catch (Exception e) {
Toast.makeText(MainActivity.this, "Fail " + e.getMessage(), Toast.LENGTH_SHORT).show();
}
String street = addresses.get(0).getThoroughfare();
Log.i("I0",street);
String city = addresses.get(0).getLocality();
Log.i("I1",city);
String county = addresses.get(0).getSubAdminArea();
Log.i("I2",county);
String country = addresses.get(0).getCountryName();
Log.i("I3",country);
String postalCode = addresses.get(0).getPostalCode();
Log.i("I4",postalCode);
display.setText(street + "\n" + city + "\n" + country + "\n" + postalCode ); }
错误是
07-13 21:15:26.717 10744-10744/com.example.mandeep.testing I/i1: ct3456
07-13 21:15:26.856 10744-10744/com.example.mandeep.testing D/AndroidRuntime: Shutting down VM
07-13 21:15:26.857 10744-10744/com.example.mandeep.testing E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.mandeep.testing, PID: 10744
java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
at java.util.ArrayList.get(ArrayList.java:308)
at com.example.mandeep.testing.MainActivity.finder(MainActivity.java:85)
at com.example.mandeep.testing.MainActivity$1.onQueryTextSubmit(MainActivity.java:47)
at android.widget.SearchView.onSubmitQuery(SearchView.java:1197)
at android.widget.SearchView.access$900(SearchView.java:92)
at android.widget.SearchView$8.onEditorAction(SearchView.java:1175)
at android.widget.TextView.onEditorAction(TextView.java:4473)
at com.android.internal.widget.EditableInputConnection.performEditorAction(EditableInputConnection.java:139)
at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:304)
at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:78)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5219)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:898)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
07-13 21:15:26.878 10744-10744/? I/Process: Sending signal. PID: 10744 SIG: 9
我试过
if(addresses != null && addresses.size() > 0) {
String street = addresses.get(0).getThoroughfare();
Log.i("I0", street);
String city = addresses.get(0).getLocality();
Log.i("I1", city);
String county = addresses.get(0).getSubAdminArea();
Log.i("I2", county);
String country = addresses.get(0).getCountryName();
Log.i("I3", country);
String postalCode = addresses.get(0).getPostalCode();
Log.i("I4", postalCode);
display.setText(street + "\n" + city + "\n" + country + "\n" + postalCode);
}
else{
Toast.makeText(MainActivity.this, "No Results Found", Toast.LENGTH_SHORT).show();
}
仍然是同样的问题。
我现在编辑了代码
public void finder(String query){
Geocoder geocoder;
List<Address> addresses = new ArrayList<Address>();
geocoder = new Geocoder(this, Locale.getDefault());
try {
//addresses = geocoder.getFromLocation(51.283973, 1.064928, 1); // Here 1 represent max location result to returned, by documents it recommended 1 to 5
addresses = geocoder.getFromLocationName(query,1);
} catch (Exception e) {
Toast.makeText(MainActivity.this, "Fail " + e.getMessage(), Toast.LENGTH_SHORT).show();
}
Log.i("yes",addresses.size() + "");
if(addresses != null && addresses.size() > 0) {
Log.i("yes","checked");
String street = addresses.get(0).getThoroughfare();
Log.i("I0", street);
String city = addresses.get(0).getLocality();
Log.i("I1", city);
String county = addresses.get(0).getSubAdminArea();
Log.i("I2", county);
String country = addresses.get(0).getCountryName();
Log.i("I3", country);
String postalCode = addresses.get(0).getPostalCode();
Log.i("I4", postalCode);
display.setText(street + "\n" + city + "\n" + country + "\n" + postalCode);
}
else{
Toast.makeText(MainActivity.this, "No Results Found", Toast.LENGTH_SHORT).show();
}
}
现在错误是
07-13 22:21:02.782 32088-32088/com.example.mandeep.testing I/i1: ct28dx
07-13 22:21:02.942 32088-32088/com.example.mandeep.testing I/yes: 1
07-13 22:21:02.942 32088-32088/com.example.mandeep.testing I/yes: checked
07-13 22:21:02.942 32088-32088/com.example.mandeep.testing D/AndroidRuntime: Shutting down VM
07-13 22:21:02.944 32088-32088/com.example.mandeep.testing E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.mandeep.testing, PID: 32088
java.lang.NullPointerException: println needs a message
at android.util.Log.println_native(Native Method)
at android.util.Log.i(Log.java:160)
at com.example.mandeep.testing.MainActivity.finder(MainActivity.java:93)
at com.example.mandeep.testing.MainActivity$1.onQueryTextSubmit(MainActivity.java:52)
at android.widget.SearchView.onSubmitQuery(SearchView.java:1197)
at android.widget.SearchView.access$900(SearchView.java:92)
at android.widget.SearchView$8.onEditorAction(SearchView.java:1175)
at android.widget.TextView.onEditorAction(TextView.java:4473)
at com.android.internal.widget.EditableInputConnection.performEditorAction(EditableInputConnection.java:139)
at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:304)
at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:78)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5219)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:898)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
07-13 22:21:02.973 32088-32088/com.example.mandeep.testing I/Process: Sending signal. PID: 32088 SIG: 9
答案 0 :(得分：2)
您应首先检查阵列的大小
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>THEMES</title>
<link rel="shortcut icon" href="https://assets.tumblr.com/images/default_avatar/sphere_closed_128.png">
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<div id="topbar">
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<div class="postnote">
</div>
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<div id="post">
<iframe src="https://w.soundcloud.com/player/?url=https%3A%2F%2Fapi.soundcloud.com%2Ftracks%2F4595620&visual=true&liking=false&sharing=false&auto_play=false&show_comments=false&continuous_play=false&origin=tumblr" frameborder="0"
allowtransparency="true" class="soundcloud_audio_player" width="500" height="500"></iframe>
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<div class="tags">
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<div class="postinfo"> <a href="https://themesforyou.tumblr.com/post/162913135663/chat-example">5:14 pm</a> </div>
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<p>Link example</p>
<div class="postinfo"> <a href="https://themesforyou.tumblr.com/post/162913065653/lorem-ipsum-all-the-facts-lipsum-generator">5:12 pm</a> </div>
<div class="tags">
<a href="https://themesforyou.tumblr.com/tagged/link-post">#link post</a> <a href="https://themesforyou.tumblr.com/tagged/post-example">#post example</a> </div>
<div class="postnote">
</div>
</div>
<div id="post">
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<p></p>— Source
<div class="postinfo"> <a href="https://themesforyou.tumblr.com/post/162913036513/this-is-what-a-quote-looks-like">5:11 pm</a> </div>
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<div id="post">
<a href="https://themesforyou.tumblr.com/image/162913004603"><img src="https://68.media.tumblr.com/cf975a46b1a6b0183ea6e5017f56271c/tumblr_oszxhlV6bZ1wuevxyo1_500.png"></a>
<p>Photo example</p>
<div class="postinfo"> <a href="https://themesforyou.tumblr.com/post/162913004603/photo-example">5:10 pm</a> </div>
<div class="tags">
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<div id="post">
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<div class="postinfo"> <a href="https://themesforyou.tumblr.com/post/162912904188/text-example">5:07 pm</a> </div>
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</div>
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</body>
</html>你要从索引0获取数据，但你的列表是空的。
答案 1 :(得分：0)
此行geocoder.getFromLocationName(query,1);返回一个空列表。可能是因为没有找到匹配项或者没有可用的后端服务（根据https://developer.android.com/reference/android/location/Geocoder.html）。在对列表执行操作之前，您应该检查addresses != null && addresses.size() > 0是否为真。
答案 2 :(得分：0)
如前所述，不要假设Geocoder.getFromLocationName()总是返回结果。它可以返回一个空数组。
此外：
Address.getLocality()，Address.getAdminArea()等可以返回null。你必须检查这个。Address.getAddressLine(int)中的行数。使用Address.getMaxAddressLineIndex()检查实际返回的行数。答案 3 :(得分：-1)
我遇到了同样的问题，然后我在开头声明了一个具有默认值的变量，因此，如果对请求有答复，则将覆盖该变量，否则将返回默认值。在这种情况下，您可以简单地写出“某些内容无法正常运行，请重试”或类似的内容。
fun getCountryCodeFromName(locationName: String = "California"): String {
var postalCode:String = "00000"
try {
if (find(locationName).size !=0)
countryCode = cityNameReq(locationName)[0].postalCode
} catch (e: Exception) {
resultMessage = Resources.getSystem().getString(R.string.catch_me)
Log.e(TAG, resultMessage, e)
}
return postalCode
}
基本上
`var postalCode:String = "00000"`
。
，如果请求成功，则postalCode将获得分配给它的新值，如您在此行中所见：
countryCode = cityNameReq(locationName)[0].postalCode
PS：我知道发问者已经很晚了，但是我将答案发送给仍然有此问题并正在寻找答案的人：