Java Android Studio:无法解析getApplication()
我试图访问UARTlogfragment.java中AndroidManifest.xml中声明的全局变量,但在使用Java Android Studio:无法解析getApplication(),java,android,sqlite,Java,Android,Sqlite,我试图访问UARTlogfragment.java中AndroidManifest.xml中声明的全局变量,但在使用getApplication()时出现错误,即“无法解析”。 我在这里发布我的Androidmanifest.xml和UARTlogfragment.java AndroidManifest.xml是: <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <
getApplication()
时出现错误,即“无法解析”。
我在这里发布我的Androidmanifest.xml和UARTlogfragment.java
AndroidManifest.xml是:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.NFC" />
<uses-permission android:name="no.nordicsemi.android.LOG" />
<uses-feature
android:name="android.hardware.bluetooth_le"
android:required="true" />
<!-- To auto-complete the email text field in the login form with the user's emails -->
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.READ_PROFILE" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<application
android:name=".ToolboxApplication"
android:allowBackup="true"
android:fullBackupContent="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:theme="@style/AppTheme"
tools:ignore="GoogleAppIndexingWarning">
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<activity
android:name=".SplashscreenActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.Fullscreen">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<meta-data
android:name="android.app.shortcuts"
android:resource="@xml/shortcuts" />
<intent-filter>
<action android:name="android.nfc.action.NDEF_DISCOVERED" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="application/vnd.no.nordicsemi.type.app" />
<data android:mimeType="application/vnd.no.nordicsemi.type.address" />
</intent-filter>
</activity>
<!-- Template plugin activities -->
<!-- Remember to add your plug-in Activities to the Android Manifest file. -->
<!-- Plug-in activities -->
<activity
android:name=".FeaturesActivity"
android:label="@string/app_name"
android:launchMode="singleTask"
android:theme="@style/AppTheme.TranslucentStatusBar" />
<activity
android:name=".uart.UARTActivity"
android:icon="@drawable/ic_uart_feature"
android:label="@string/uart_feature_title"
android:launchMode="singleTask"
android:windowSoftInputMode="adjustResize">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="no.nordicsemi.android.nrftoolbox.LAUNCHER" />
</intent-filter>
</activity>
<service
android:name=".proximity.ProximityService"
android:label="@string/proximity_feature_title" />
<service
android:name=".dfu.DfuService"
android:exported="true"
android:label="@string/dfu_service_title">
<intent-filter>
<action android:name="no.nordicsemi.android.action.DFU_UPLOAD" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</service>
<activity
android:name=".dfu.DfuInitiatorActivity"
android:label="@string/dfu_service_title"
android:noHistory="true"
android:theme="@style/AppTheme.Translucent">
<intent-filter>
<action android:name="no.nordicsemi.android.action.DFU_UPLOAD" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<service
android:name=".cgms.CGMService"
android:label="@string/cgms_feature_title" />
<service
android:name=".rsc.RSCService"
android:label="@string/rsc_feature_title" />
<service
android:name=".csc.CSCService"
android:label="@string/csc_feature_title" />
<service
android:name=".hts.HTSService"
android:label="@string/hts_feature_title" />
<service
android:name=".uart.UARTService"
android:label="@string/uart_feature_title" />
<service android:name=".wearable.MainWearableListenerService">
<intent-filter>
<action android:name="com.google.android.gms.wearable.DATA_CHANGED" />
<action android:name="com.google.android.gms.wearable.MESSAGE_RECEIVED" />
<data
android:host="*"
android:pathPrefix="/nrftoolbox"
android:scheme="wear" />
</intent-filter>
</service>
<provider
android:name=".uart.UARTLocalLogContentProvider"
android:authorities="no.nordicsemi.android.nrftoolbox.uart.log"
android:exported="true" />
<activity
android:name=".Register_Page"
android:label="@string/title_activity_register__page" />
<activity android:name=".View_Profile" />
<activity android:name=".Profile" />
<activity android:name=".Wallet_Page" />
<activity android:name=".confirm_booking" />
<activity android:name=".LoginActivity" />
<activity android:name=".Add_Amount" />
<activity android:name=".last_step_book"></activity>
</application>
错误是什么??为什么它不能解决getApplication()
?更改
String s = ((ToolboxApplication) this.getApplication()).getSomeVariable();
到
当您试图从片段中使用应用程序上下文时,您不能使用
getApplication()
,因为它不是片段类的方法因此,首先必须使用
getActivity()
,它将返回片段当前与之关联的片段活动
要在代码中进行汇总,您必须使用
getActivity.getApplication()
而不是this.getApplication()
getActivity().getApplication()
。
String s = ((ToolboxApplication) this.getApplication()).getSomeVariable();
String s = ((ToolboxApplication) getActivity().getApplication()).getSomeVariable();