Google地图出现错误的搜索功能(Android Studios)
Google地图出现错误的搜索功能(Android Studios)
提问于 2017-03-05 13:20:38
好的，现在我正在做的是添加一个简单的应用程序来报告和定位故障的汽车。在第三个屏幕上，我让用户输入一个地址，单击搜索按钮，按钮上的一个小地图将在找到后移动到该位置。如果用户满意，他可以单击Submit按钮并进入下一个屏幕...( submit按钮还没有完成，我只是在测试地图)
我遵循了youtuber here...and给出的步骤当我测试我的应用程序时，我以为我已经想通了，我试着输入一些简单的东西，比如out...Yet out...Yet，我得到了一个致命的错误信息……
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.greyknightdante.roadsideassistance, PID: 7950
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.view.View$DeclaredOnClickListener.onClick(View.java:4698)
at android.view.View.performClick(View.java:5610)
at android.view.View$PerformClick.run(View.java:22265)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.view.View$DeclaredOnClickListener.onClick(View.java:4693)
at android.view.View.performClick(View.java:5610)
at android.view.View$PerformClick.run(View.java:22265)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference
at com.example.greyknightdante.roadsideassistance.MapsActivity.onSearch(MapsActivity.java:45)
at java.lang.reflect.Method.invoke(Native Method)
at android.view.View$DeclaredOnClickListener.onClick(View.java:4693)
at android.view.View.performClick(View.java:5610)
at android.view.View$PerformClick.run(View.java:22265)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) 我还是Android Studios的新手，更糟糕的是，我现在也病了，不能直接思考我的头痛(来自寒冷和这个该死的应用程序).....I有一周的时间来完成这个应用程序，所以我现在很忙……
我不能完全弄清楚是什么导致了这个错误以及如何修复它……我有一种感觉，可能是我的搜索按钮的onClick，但是我不能是sure...Can，有人能帮我吗？任何帮助都将不胜感激！
下面是我的Java活动代码
package com.example.greyknightdante.roadsideassistance;
import android.content.Intent;
import android.location.Address;
import android.location.Geocoder;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import java.io.IOException;
import java.util.List;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback{
private GoogleMap mMap;
public String problem;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
//obtain previous data
Intent intent = getIntent();
problem = intent.getStringExtra(ReportActivity.EXTRA_MESSAGE);
}
public void onSearch(View view){
EditText location_input = (EditText) view.findViewById(R.id.locationInputText);
String location = location_input.getText().toString();
List<Address> addressList = null;
if(location != null || location.equals("")) {
Geocoder geocoder = new Geocoder(this);
try {
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("Marker"));
mMap.animateCamera(CameraUpdateFactory.newLatLng(latLng));
}
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(-34, 151);
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}这是我的地图和搜索功能的一部分。
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/gpsLayout">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="What is your location?"
android:id="@+id/locationTextView"
android:textSize="30dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPostalAddress"
android:ems="10"
android:id="@+id/locationInputText"
android:text=""
android:hint="Enter Location..."
android:layout_below="@+id/locationTextView"
android:layout_centerHorizontal="true"
android:layout_marginTop="27dp"
android:background="@color/white"
android:textSize="25dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Search"
android:id="@+id/enterGPSButton"
android:layout_below="@+id/locationInputText"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:onClick="onSearch"/>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="250dp"
android:layout_below="@+id/locationInputText"
android:layout_marginTop="55dp"
android:id="@+id/mapLayout">
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.greyknightdante.roadsideassistance.MapsActivity"/>
</RelativeLayout>回答 1
Stack Overflow用户
回答已采纳
发布于 2017-03-05 14:08:44
问题出在这一行：
EditText location_input = (EditText) view.findViewById(R.id.locationInputText);此处Editext未连接到onSearch(View view)
因此，改变：
EditText location_input; //declare globally
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gps);
location_input = (EditText)findViewById(R.id.locationInputText); //initialize here
}现在在您的onSearch()方法中
public void onSearch(View view){
String location = location_input.getText().toString();
//rest of the code
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/42604814
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