当编辑文本为空时，谷歌地图地址搜索崩溃

Question

嗨，我已经在我的应用程序中做了一个o'clock方法，它根据用户输入的编辑文本搜索地址。这工作得很好，但当我按下搜索按钮时，编辑文本是空的崩溃。你能指出我哪里做错了吗?我该如何解决这个问题?

public void onSearch(View view) {
    EditText findLocation = (EditText) findViewById(R.id.editText);
    String location = findLocation.getText().toString();
    List<Address> addressList = null;

    if (location != null || !location.equals("")) {

        //Geocode gecoder = new Geocoder(this)
        //geocoder.getFromLocationName(location, 1);
        //then add try and catch

        Geocoder geocoder = new Geocoder(this);
        try {

            addressList = geocoder.getFromLocationName(location, 1);

            //after try and catch
            // List<Address> addressList = geocoder.getFromLocationName(location, 1);

        } catch (IOException e) {




            e.printStackTrace();

        }
    }
    Address address = addressList.get(0);
    LatLng latLng = new LatLng(address.getLatitude(), address.getLongitude());
    mMap.addMarker(new MarkerOptions().position(latLng).title(location.toString()));
    mMap.animateCamera(CameraUpdateFactory.newLatLng(latLng));

}

堆栈跟踪

   java.lang.IllegalStateException: Could not execute method for android:onClick
at android.view.View$DeclaredOnClickListener.onClick(View.java:4452)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.view.View$DeclaredOnClickListener.onClick(View.java:4447)
at android.view.View.performClick(View.java:5198) 
at android.view.View$PerformClick.run(View.java:21147) 
at android.os.Handler.handleCallback(Handler.java:739) 
at android.os.Handler.dispatchMessage(Handler.java:95) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5417) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
Caused by: 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.hadleigh.googlemapstest.MapsActivity.onSearch(MapsActivity.java:91)
at java.lang.reflect.Method.invoke(Native Method) 
at android.view.View$DeclaredOnClickListener.onClick(View.java:4447) 
at android.view.View.performClick(View.java:5198) 
at android.view.View$PerformClick.run(View.java:21147) 
at android.os.Handler.handleCallback(Handler.java:739) 
at android.os.Handler.dispatchMessage(Handler.java:95) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5417) 

Answer 1

您有正确的逻辑来检查您的EditText是否为空，但您仍然期望您的addressList填充结果。您需要将addMarker逻辑放在try-catch blocks中，或者检查addressList是否为空:

if (addressList != null && !addressList.isEmpty()) {
    Address address = addressList.get(0);
    LatLng latLng = new LatLng(address.getLatitude(), address.getLongitude());
    mMap.addMarker(new MarkerOptions().position(latLng).title(location.toString()));
    mMap.animateCamera(CameraUpdateFactory.newLatLng(latLng));
}

Answer 2

public boolean onSearch(View view) {
    EditText findLocation = (EditText) findViewById(R.id.editText);
    String location = findLocation.getText().toString();
    List<Address> addressList = null;

    if (location.isEmpty()) {
        Toast.makeText(getApplicationContext(), "Please enter address", Toast.LENGTH_LONG).show();
        return true;

    }else {
        //Geocode gecoder = new Geocoder(this)
        //geocoder.getFromLocationName(location, 1);
        //then add try and catch

        Geocoder geocoder = new Geocoder(this);
        try {

            addressList = geocoder.getFromLocationName(location, 1);

            //after try and catch
            // List<Address> addressList = geocoder.getFromLocationName(location, 1);

        } catch (IOException e) {




            e.printStackTrace();

        }
    }
    Address address = addressList.get(0);
    LatLng latLng = new LatLng(address.getLatitude(), address.getLongitude());
    mMap.addMarker(new MarkerOptions().position(latLng).title(location.toString()));
    mMap.animateCamera(CameraUpdateFactory.newLatLng(latLng));

    return false;
}