Stackoverflow，我需要你的帮助......我开始学习Android应用程序编程，并且我很难用这个：
我试图在Android Studio上稍微重现this example，但在调用LocationServices.FusedLocationApi.requestLocationUpdates（）时我一直挂起。我已经设置了我的代码，因此只有在按下UI按钮时才会运行。我点击它，我的应用程序说＆＃34;不幸的是＆＃39; myApp＆＃39;已停止＆＃34;。
这是我的MainActivity.java
package com.ricardohalfeld.mygpsapi22;
import android.Manifest;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
public class MainActivity extends AppCompatActivity implements ConnectionCallbacks, OnConnectionFailedListener, LocationListener{
//Variable Declaration
protected GoogleApiClient mGoogleApiClient;
protected LocationRequest mLocationRequest;
Location mLastLocation;
TextView mLatitudeTextView;
TextView mLongitudeTextView;
TextView mDataOriginTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getHoldOfTextViews();
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this,Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
buildGoogleApiClient();
}
}
else {
buildGoogleApiClient();
}
}
//Activity related methods
@Override
protected void onStart() {
super.onStart();
}
@Override
protected void onPause() {
super.onPause();
}
@Override
protected void onResume() {
super.onResume();
}
void getHoldOfTextViews(){
mLatitudeTextView = (TextView) findViewById(R.id.latTextView);
mLongitudeTextView = (TextView) findViewById(R.id.lonTextView);
mDataOriginTextView = (TextView) findViewById(R.id.dataOriginTextView);
}
//Google API Client related methods
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
@Override
public void onConnected(Bundle bundle) {
requestLastLocation();
createLocationRequest();
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
@Override
public void onLocationChanged(Location location) {
}
protected void createLocationRequest() {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(10000);
mLocationRequest.setFastestInterval(5000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
//API23 requirement
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
startLocationUpdates();
}
}
void requestLastLocation(){
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (mLastLocation != null) {
mLatitudeTextView.setText(String.valueOf(mLastLocation.getLatitude()));
mLongitudeTextView.setText(String.valueOf(mLastLocation.getLongitude()));
mDataOriginTextView.setText("Data originated from requestLastLocation();");
}
else {
mDataOriginTextView.setText("Location is null");
}
}
protected void startLocationUpdates() {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
mDataOriginTextView.setText("Data originated from startLocationUpdates();");
}
public void testMethodWithButton(View v){ //Passing the View is required for the button to work
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {//API23 requirement
startLocationUpdates();
mDataOriginTextView.setText("Permission Granted in Manifest");
}
else {
mDataOriginTextView.setText("Permission NOT Granted in Manifest");
}
}
}
这就是我的content_main.xml：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.ricardohalfeld.mygpsapi22.MainActivity"
tools:showIn="@layout/activity_main">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="GPS Data"
android:id="@+id/textView"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Latitude"
android:id="@+id/latTextView"
android:layout_below="@+id/textView"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Longitude"
android:id="@+id/lonTextView"
android:layout_below="@+id/latTextView"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Valid for API22"
android:id="@+id/textView2"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Request Location Updates"
android:id="@+id/callMethodButton"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:onClick="testMethodWithButton"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="No Data Generated"
android:id="@+id/dataOriginTextView"
android:layout_below="@+id/lonTextView"
android:layout_alignParentStart="true" />
</RelativeLayout>
从这篇文章之前的研究中，我相信你也想看到这些：
我的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ricardohalfeld.mygpsapi22">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<!--Required for Location awareness-->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<!--<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>-->
</manifest>
为了把事情搞定，我的Build.Gradle（模块：应用程序）
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.3"
defaultConfig {
applicationId "com.ricardohalfeld.mygpsapi22"
minSdkVersion 19
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.2.1'
compile 'com.android.support:design:23.2.1'
compile 'com.google.android.gms:play-services:8.4.0'
}
添加堆栈跟踪似乎，至少对于我没有经验的眼睛，就像问题一样：
04-13 15:37:22.882 31046-31046/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.ricardohalfeld.mygpsapi22, PID: 31046
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:5254)
at android.view.View$PerformClick.run(View.java:21179)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6837)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5254)
at android.view.View$PerformClick.run(View.java:21179)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6837)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
Caused by: java.lang.IllegalStateException: GoogleApiClient is not connected yet.
at com.google.android.gms.common.api.internal.zzj.zzb(Unknown Source)
at com.google.android.gms.location.internal.zzd.requestLocationUpdates(Unknown Source)
at com.ricardohalfeld.mygpsapi22.MainActivity.startLocationUpdates(MainActivity.java:130)
at com.ricardohalfeld.mygpsapi22.MainActivity.testMethodWithButton(MainActivity.java:137)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5254)
at android.view.View$PerformClick.run(View.java:21179)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6837)
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:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
感谢您的帮助！
答案 0 :(得分：1)
您已经错过了对GoogleApiClient的connect()来电。
您只需将呼叫添加到buildGoogleApiClient()功能：
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
在请求位置更新之前，还要向isConnected()添加支票：
public void testMethodWithButton(View v){ //Passing the View is required for the button to work
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {//API23 requirement
//don't call startLocationUpdates if mGoogleApiClient is not connected:
if (mGoggleApiClient.isConnected()) {
startLocationUpdates();
}
mDataOriginTextView.setText("Permission Granted in Manifest");
}
else {
mDataOriginTextView.setText("Permission NOT Granted in Manifest");
}
}