Logcat显示运行时错误，我无法检测到问题 我的location_page.java
package com.example.sunny.myapplication2;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.PendingResult;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.location.places.PlaceBuffer;
import com.google.android.gms.location.places.Places;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.LatLngBounds;
/**
* Created by sunny on 3/26/2016.
*/
public class location_page extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks
,GoogleApiClient.OnConnectionFailedListener,View.OnClickListener{
//Declaring Variables
protected GoogleApiClient myGoogleApiClient;
private static final LatLngBounds myBounds = new LatLngBounds(
new LatLng(-0,0),new LatLng(0,0));
private EditText myATView;
private RecyclerView myRecyclerView;
private LinearLayoutManager myLinearLayoutManager;
private AT_Adapter myATAdapter;
Button clearText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.location_page);
// Assigning Values to Variables
myATView = (EditText)findViewById(R.id.autocomplete_tv);
clearText = (Button)findViewById(R.id.clear_text_Button);
myATAdapter = new AT_Adapter(this,R.layout.search_row,myGoogleApiClient,myBounds,null);
myRecyclerView = (RecyclerView)findViewById(R.id.recyclerView);
myLinearLayoutManager = new LinearLayoutManager(this);
myRecyclerView.setLayoutManager(myLinearLayoutManager);
myRecyclerView.setAdapter(myATAdapter);
clearText.setOnClickListener(this);
//Setting the editText Listener
myATView.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
if(!s.toString().equals("") && myGoogleApiClient.isConnected()) {
myATAdapter.getFilter().filter(s.toString());
}
else if(!myGoogleApiClient.isConnected())
{
Toast.makeText(location_page.this, "Google Api Client is not connected",
Toast.LENGTH_SHORT).show();
}
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// ToDO The Auto-Generated Stub
}
@Override
public void afterTextChanged(Editable s) {
// ToDo The Auto-Generated Stub
}
});
myRecyclerView.addOnItemTouchListener(
new Recycler_Listener(this,new Recycler_Listener.OnItemClickListener(){
@Override
public void onItemClick(View view,int position){
final AT_Adapter.PlaceAutoComplete item = myATAdapter.getItem(position);
final String placeId = String.valueOf(item.placeId);
PendingResult<PlaceBuffer>placeResult = (PendingResult<PlaceBuffer>)Places.GeoDataApi
.getPlaceById(myGoogleApiClient,placeId);
placeResult.setResultCallback(new ResultCallback<PlaceBuffer>() {
@Override
public void onResult(PlaceBuffer places) {
if(places.getCount()==1){
Toast.makeText(getApplicationContext(),String.valueOf(places.get(0).getLatLng()),
Toast.LENGTH_LONG).show();
}
}
});
}
}
)
);
}
protected synchronized void buildGoogleApiClient(){
myGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.addApi(Places.GEO_DATA_API)
.build();
}
@Override
public void onConnected(Bundle bundle) {
// ToDO The Auto-Generated Stub
}
@Override
public void onConnectionSuspended(int i) {
// ToDO The Auto-Generated Stub
}
@Override
public void onClick(View v) {
if(v == clearText){
myATView.setText("");
}
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
// ToDO The Auto-Generated Stub
}
@Override
public void onResume(){
super.onResume();
if(!myGoogleApiClient.isConnected() && !myGoogleApiClient.isConnecting()){
myGoogleApiClient.connect();
}
}
@Override
public void onPause(){
super.onPause();
if(myGoogleApiClient.isConnected())
myGoogleApiClient.disconnect();
}
@Override
public void onBackPressed(){
super.onBackPressed();
}
}
我的AT_Adapter.java文件是
package com.example.sunny.myapplication2;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.PendingResult;
import com.google.android.gms.common.api.Status;
import com.google.android.gms.location.places.AutocompleteFilter;
import com.google.android.gms.location.places.AutocompletePrediction;
import com.google.android.gms.location.places.AutocompletePredictionBuffer;
import com.google.android.gms.location.places.Places;
import com.google.android.gms.maps.model.LatLngBounds;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.concurrent.TimeUnit;
/**
* Created by sunny on 3/26/2016.
*/
public class AT_Adapter extends RecyclerView.Adapter
<AT_Adapter.PredictionHolder> implements Filterable{
private ArrayList<PlaceAutoComplete>myResultList;
private GoogleApiClient myGoogleApiClient;
private LatLngBounds myBounds;
private AutocompleteFilter myAutoCompleteFilter;
private Context myContext;
private int layout;
private char[] description;
public AT_Adapter(Context context,int resource,GoogleApiClient googleApiClient,
LatLngBounds latLngBounds,AutocompleteFilter autocompleteFilter){
myContext = context;
layout = resource;
myGoogleApiClient = googleApiClient;
myBounds = latLngBounds;
myAutoCompleteFilter = autocompleteFilter;
}
/*
** Set the Bounds for all subsequent queries
*/
public void setBounds(LatLngBounds bounds){
myBounds =bounds;
}
/*
** Returns the filter for Current Set of AutoComplete Result
*/
@Override
public Filter getFilter(){
Filter filter = new Filter(){
@Override
protected FilterResults performFiltering(CharSequence constraint){
FilterResults results = new FilterResults();
//Skip The AutoComplete query if no constraints are given
if(constraint != null){
//Query The AutoComplete Api for constraint String
myResultList = getAutoComplete(constraint);
if(myResultList != null){
//Api successfully returned results.
results.values = myResultList;
results.count = myResultList.size();
}
}
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
if(results != null && results.count > 0){
//The Api returned atleast one result,update the result
notifyDataSetChanged();
}
else {
//The Api did not return any result
//notifyDataSetInvalid();
}
}
};
return filter;
}
private ArrayList<PlaceAutoComplete> getAutoComplete(CharSequence constraint) {
if(myGoogleApiClient.isConnected()){
//Submit the query to the AutoComplete API and retrieve a PendingResult that
//contain results when query completes
PendingResult<AutocompletePredictionBuffer> results = Places.GeoDataApi
.getAutocompletePredictions(myGoogleApiClient,constraint.toString(),
myBounds,myAutoCompleteFilter);
// This method should have been called off the main UI thread. Block and wait for at most 60s
// for a result from the API
AutocompletePredictionBuffer autocompletePredictions = results.await(60, TimeUnit.SECONDS);
// Confirm that the query completed successfully, otherwise return null
final Status status = autocompletePredictions.getStatus();
if(!status.isSuccess()){
Toast.makeText(myContext,"Error Contacting Api"+status.toString(),
Toast.LENGTH_LONG).show();
autocompletePredictions.release();
return null;
}
// Copy the results into our own data structure, because we can't hold onto the buffer.
// AutocompletePrediction objects encapsulate the API response (place ID and description).
Iterator<AutocompletePrediction> iterator = autocompletePredictions.iterator();
ArrayList resultlist = new ArrayList<>(autocompletePredictions.getCount());
while (iterator.hasNext()){
AutocompletePrediction prediction = iterator.next();
// Get the details of this prediction and copy it into a new PlaceAutocomplete object.
resultlist.add(new PlaceAutoComplete(prediction.getPlaceId(),
prediction.getDescription()));
}
// Release the buffer now that all data has been copied.
autocompletePredictions.release();
return resultlist;
}
return null;
}
@Override
public PredictionHolder onCreateViewHolder(ViewGroup parent, int i) {
LayoutInflater layoutInflater = (LayoutInflater)myContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View convertView = layoutInflater.inflate(layout,parent,false);
PredictionHolder myPredictionHolder = new PredictionHolder(convertView);
return myPredictionHolder;
}
@Override
public void onBindViewHolder(PredictionHolder holder, int i) {
holder.myPrediction.setText(myResultList.get(i).description);
}
@Override
public int getItemCount() {
if(myResultList!=null){
return myResultList.size();
}
else
return 0;
}
public PlaceAutoComplete getItem(int position){
return myResultList.get(position);
}
public class PredictionHolder extends RecyclerView.ViewHolder {
private TextView myPrediction;
private RelativeLayout myRow;
public PredictionHolder(View itemView){
super(itemView);
myPrediction = (TextView)itemView.findViewById(R.id.address);
myRow = (RelativeLayout)itemView.findViewById(R.id.autocomplete_row);
}
}
public class PlaceAutoComplete {
public CharSequence placeId;
public CharSequence description;
PlaceAutoComplete(CharSequence placeId, CharSequence description) {
this.placeId = placeId;
this.description = description;
}
@Override
public String toString() {
return description.toString();
}
}
}
和Recycler_Listener.java是
package com.example.sunny.myapplication2;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
/**
* Created by sunny on 3/26/2016.
*/
public class Recycler_Listener implements RecyclerView.OnItemTouchListener {
private OnItemClickListener myOnItemClickListener;
GestureDetector myGestureDetector;
public interface OnItemClickListener{
public void onItemClick(View view,int position);
}
public Recycler_Listener(Context context,OnItemClickListener listener){
myOnItemClickListener = listener;
myGestureDetector = new GestureDetector(context,new GestureDetector.SimpleOnGestureListener(){
@Override public boolean onSingleTapUp(MotionEvent e){
return true;
}
}
);
}
@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View childView = rv.findChildViewUnder(e.getX(),e.getY());
if(childView != null && myOnItemClickListener != null && myGestureDetector.onTouchEvent(e)){
myOnItemClickListener.onItemClick(childView,rv.getChildLayoutPosition(childView));
return true;
}
return false;
}
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
// TODO THE AUTO-GENERATED STUFF
}
@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
// TODO THE AUTOGENERATED STUFF
}
}
并且manifest.xml是
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.sunny.myapplication2">
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/Base.Theme.AppCompat.Light">
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="AIzaSyC8kZ4aF38gKVfBB-9S8k5BZkj9vDrHLtc"/>
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
//Main_Activity
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
//Register
<activity android:name=".register_final"
android:label="register_final"
android:theme="@style/Base.Theme.AppCompat.Light">
</activity>
//Location
<activity android:name=".location_page">
</activity>
</application>
</manifest>
并且logcat错误是
03-27 00:29:22.999 16719-16719/com.example.sunny.myapplication2 E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.sunny.myapplication2, PID: 16719
java.lang.RuntimeException: Unable to resume activity {com.example.sunny.myapplication2/com.example.sunny.myapplication2.location_page}: java.lang.NullPointerException
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2774)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2803)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2238)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.example.sunny.myapplication2.location_page.onResume(location_page.java:152)
at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1192)
at android.app.Activity.performResume(Activity.java:5310)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2764)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2803)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2238)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
当我尝试运行该程序时，发生了Logcat错误并且应用程序不幸停止