java-getAction()或Intent上的NullPointerException

概述我想通过Google地方信息API在 *** 作栏中使用搜索视图小部件,偶然发现了指向StackOverflow各个帖子中共享的教程的链接,因此我决定进行检查.我已经将其全部实现到现有代码中,但是我遇到了NullPointerException并希望有人可以帮助我,以便我可以调试问题.我一直在浏览StackOverflow上

我想通过Google地方信息API在 *** 作栏中使用搜索视图小部件,偶然发现了指向Stack Overflow各个帖子中共享的教程的链接,因此我决定进行检查.我已经将其全部实现到现有代码中,但是我遇到了NullPointerException并希望有人可以帮助我,以便我可以调试问题.我一直在浏览Stack Overflow上的各种帖子以及Google上的文章…

Logcat指定它是由第119和123行引起的.

MainActivity.java：

@H_404_9@public class MainActivity extends FragmentActivity implementsGooglePlayServicesClIEnt.ConnectionCallbacks,GooglePlayServicesClIEnt.OnConnectionFailedListener,LocationListener,OnMapLongClickListener,LoaderCallbacks<Cursor> {//Global Constantsprivate final static int CONNECTION_FAILURE_RESolUTION_REQUEST = 9000;// Milliseconds per secondprivate static final int MILliSECONDS_PER_SECOND = 1000;// Update frequency in secondspublic static final int UPDATE_INTERVAL_IN_SECONDS = 5;// Update frequency in millisecondsprivate static final long UPDATE_INTERVAL =        MILliSECONDS_PER_SECOND * UPDATE_INTERVAL_IN_SECONDS;// The fastest update frequency, in secondsprivate static final int FASTEST_INTERVAL_IN_SECONDS = 1;// A fast frequency ceiling in millisecondsprivate static final long FASTEST_INTERVAL =        MILliSECONDS_PER_SECOND * FASTEST_INTERVAL_IN_SECONDS;//Global VariablesGoogleMap map;Marker marker;LocationRequest requestLocation;LocationClIEnt locationClIEnt;LocationManager locationManager;boolean updatesRequested;Geofence geoFence;Vibrator vibStatus;@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    // Create the LocationRequest object    requestLocation = LocationRequest.create();    // Use high accuracy    requestLocation.setPriority(            LocationRequest.PRIORITY_HIGH_ACCURACY);    // Set the update interval to 5 seconds    requestLocation.setInterval(UPDATE_INTERVAL);    // Set the fastest update interval to 1 second    requestLocation.setFastestInterval(FASTEST_INTERVAL);    SupportMapFragment fragment = (SupportMapFragment) getSupportFragmentManager().findFragmentByID(R.ID.map);    map = fragment.getMap();    //Enables "My Location" button on map fragment    map.getUiSettings().setMyLocationbuttonEnabled(true);    //Create a new location clIEnt, using the enclosing class to handle callbacks.    locationClIEnt = new LocationClIEnt(this, this, this);    // Start with updates turned off    updatesRequested = false;    //    map.setonMapLongClickListener(this);    // Look up the AdVIEw as a resource and load a request.    AdVIEw adVIEw = (AdVIEw)this.findVIEwByID(R.ID.adVIEw);    AdRequest adRequest = new AdRequest.Builder().build();    adVIEw.loadAd(adRequest);    handleIntent(getIntent()); //This is line 119 in my code  }private voID handleIntent(Intent intent){    if(intent.getAction().equals(Intent.ACTION_SEARCH)){ //This is line 123 in my code        doSearch(intent.getStringExtra(SearchManager.query));    }else if(intent.getAction().equals(Intent.ACTION_VIEW)){        getPlace(intent.getStringExtra(SearchManager.EXTRA_DATA_KEY));    }}@OverrIDeprotected voID onNewIntent(Intent intent) {    super.onNewIntent(intent);    setIntent(intent);    handleIntent(intent);}...}

AndroIDManifest.xml：

@H_404_9@<?xml version="1.0" enCoding="utf-8"?><manifest xmlns:androID="http://schemas.androID.com/apk/res/androID"package="com...." //Removed while posting on forumandroID:versionCode="1"androID:versionname="1.0" ><uses-sdk    androID:minSdkVersion="10"    androID:targetSdkVersion="19" /><!-- Protect the map component of the application using application signature --><permission    androID:name="com.....permission.MAPS_RECEIVE" //Removed while posting on forum    androID:protectionLevel="signature" /><!-- Allows to receive map --><uses-permission androID:name="com.....permission.MAPS_RECEIVE" /> //Removed while posting on forum<uses-permission androID:name="androID.permission.INTERNET" /><uses-permission androID:name="androID.permission.ACCESS_NETWORK_STATE" /><uses-permission androID:name="androID.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission androID:name="com.Google.androID.provIDers.gsf.permission.READ_GSERVICES" /><uses-permission androID:name="androID.permission.ACCESS_FINE_LOCATION" /><uses-permission androID:name="androID.permission.VIBRATE" /><uses-feature    androID:glEsversion="0x00020000"    androID:required="true" /><application    androID:allowBackup="true"    androID:icon="@drawable/ic_launcher"    androID:label="@string/app_name"    androID:theme="@style/theme.AppCompat.light.DarkActionbar" >    <activity        androID:name="com.....SplashActivity" //Removed while posting on forum        androID:label="@string/app_name"        androID:screenorIEntation="portrait" >        <intent-filter>            <action androID:name="androID.intent.action.MAIN" />            <category androID:name="androID.intent.category.LAUNCHER" />        </intent-filter>    </activity>    <activity        androID:name="com.....MainActivity" //Removed while posting on forum        androID:label="@string/app_name"        androID:launchMode="singletop"        androID:screenorIEntation="portrait" >        <intent-filter>            <action androID:name="androID.intent.action.SEARCH" />        </intent-filter>        <!-- Points to searchable activity -->        <Meta-data androID:name="androID.app.default_searchable"            androID:value="com.....MainActivity" /> //Removed while posting on forum        <!-- Points to searchable Meta data -->        <Meta-data androID:name="androID.app.searchable"            androID:resource="@xml/searchable"/>    </activity>    <activity        androID:name="com.....PreferencesActivity" //Removed while posting on forum        androID:label="@string/Title_activity_settings"        androID:parentActivityname="com.....MainActivity" //Removed while posting on forum        androID:screenorIEntation="portrait" >        <Meta-data            androID:name="androID.support.PARENT_ACTIVITY"            androID:value="com.....MainActivity" /> //Removed while posting on forum    </activity>    <activity        androID:name="com.....AlarmActivity" //Removed while posting on forum        androID:label="@string/Title_activity_alarm" >    </activity>    <activity        androID:name="com.Google.androID.gms.ads.AdActivity"        androID:configChanges="keyboard|keyboardHIDden|orIEntation|screenLayout|uiMode|screenSize|smallestScreenSize" />    <activity        androID:name="com.....PlaceJsONParser" //Removed while posting on forum        androID:label="@string/Title_activity_place_Jsonparser" >    </activity>    <activity        androID:name="com.....PlaceDetailsJsONParser" //Removed while posting on forum        androID:label="@string/Title_activity_place_details_Jsonparser" >    </activity>    <activity        androID:name="com.....PlaceProvIDer" //Removed while posting on forum        androID:label="@string/Title_activity_place_provIDer" >    </activity>     <provIDer        androID:name=".PlaceProvIDer"        androID:authoritIEs="com.....PlaceProvIDer" //Removed while posting on forum        androID:exported="false" />    <Meta-data        androID:name="com.Google.androID.gms.version"        androID:value="@integer/Google_play_services_version" />    <Meta-data        androID:name="com.Google.androID.maps.v2.API_KEY"        androID:value="MY-KEY-HERE" /> //Removed while posting on forum</application></manifest>

解决方法:

您是从SplashActivity启动MainActivity吗？搜索视图中什么时候发生？看起来像它.调用startActivity(intent)时,需要确保已为该意图添加了一个 *** 作：

@H_404_9@Intent mainActivityIntent = new Intent(context);mainActivityIntent.setAction(Intent.ACTION_SEARCH);startActivity(mainActivityIntent);

如果您(或使用意图调用您的MainActivity的任何对象)未对该意图设置 *** 作,则当您尝试对Activity中的调用意图进行getAction()时,您将获得一个空指针.

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