AndroidStudio 实例化了但是报unknown class错误
package com.example.a54297.myapplication;

import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    TextView tvSensors = (TextView) findViewById(R.id.tv_sensors);
    //获取传感器SensorManager对象
    SensorManager mSensorManager;
    List<Sensor> sensorList;

    mSensorManager = (SensorManager)getsystemService(Context.SENSOR_SERVICE);

    sensorList = mSensorManager.getSensorList(Sensor.TYPE_ALL);
    List<String> sensorNameList = new ArrayList<String>();

}

我已经声明了mSensorManager和sensorList,但是在倒数第八行以及倒数第五行程序中报unknow class错误

1个回答

你没有导入包吧
import android.hardware.SensorManager;
import android.hardware.Sensor;

oSanYeCao1234567
RoidCoder 回复hosheazhang: 没事,解决了就好
6 个月之前 回复
hosheazhang
hosheazhang 解决啦,是xml上出现了小失误,不过还是谢谢你!
6 个月之前 回复
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我做的项目extweb在Tomcat中运行时报如下错误。请高人指点啊。rn2010-10-08 15:30:26 StandardContext[/extweb]StandardWrapper.Throwablernjava.lang.ClassFormatError: Unknown constant tag 112 in class file org/mozilla/javascript/ScriptRuntimern at java.lang.ClassLoader.defineClass1(Native Method)rn at java.lang.ClassLoader.defineClass(ClassLoader.java:620)rn at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)rn at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1634)rn at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:860)rn at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1307)rn at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1189)rn at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)rn at org.mozilla.javascript.IRFactory.createPropertyGet(IRFactory.java:1022)rn at org.mozilla.javascript.Parser.propertyName(Parser.java:1910)rn at org.mozilla.javascript.Parser.memberExprTail(Parser.java:1770)rn at org.mozilla.javascript.Parser.memberExpr(Parser.java:1732)rn at org.mozilla.javascript.Parser.unaryExpr(Parser.java:1590)rn at org.mozilla.javascript.Parser.mulExpr(Parser.java:1519)rn at org.mozilla.javascript.Parser.addExpr(Parser.java:1500)rn at org.mozilla.javascript.Parser.shiftExpr(Parser.java:1480)rn at org.mozilla.javascript.Parser.relExpr(Parser.java:1454)rn at org.mozilla.javascript.Parser.eqExpr(Parser.java:1410)rn at org.mozilla.javascript.Parser.bitAndExpr(Parser.java:1399)rn at org.mozilla.javascript.Parser.bitXorExpr(Parser.java:1388)rn at org.mozilla.javascript.Parser.bitOrExpr(Parser.java:1377)rn at org.mozilla.javascript.Parser.andExpr(Parser.java:1365)rn at org.mozilla.javascript.Parser.orExpr(Parser.java:1353)rn at org.mozilla.javascript.Parser.condExpr(Parser.java:1336)rn at org.mozilla.javascript.Parser.assignExpr(Parser.java:1321)rn at org.mozilla.javascript.Parser.expr(Parser.java:1308)rn at org.mozilla.javascript.Parser.statementHelper(Parser.java:1161)rn at org.mozilla.javascript.Parser.statement(Parser.java:655)rn at org.mozilla.javascript.Parser.parse(Parser.java:377)rn at org.mozilla.javascript.Parser.parse(Parser.java:336)rn at com.yahoo.platform.yui.compressor.JavaScriptCompressor.parse(JavaScriptCompressor.java:312)rn at com.yahoo.platform.yui.compressor.JavaScriptCompressor.(JavaScriptCompressor.java:533)rn at com.softwarementors.extjs.djn.jscodegen.Minifier.minify(Minifier.java:71)rn at com.softwarementors.extjs.djn.api.RegisteredCode.getMinifiedCode(RegisteredCode.java:87)rn at com.softwarementors.extjs.djn.jscodegen.CodeFileGenerator.generateCode(CodeFileGenerator.java:97)rn at com.softwarementors.extjs.djn.jscodegen.CodeFileGenerator.updateSource(CodeFileGenerator.java:64)rn at com.softwarementors.extjs.djn.servlet.DirectJNgineServlet.createDirectJNgineRouter(DirectJNgineServlet.java:195)rn at com.softwarementors.extjs.djn.servlet.DirectJNgineServlet.init(DirectJNgineServlet.java:155)rn at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1029)rn at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:862)rn at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4013)rn at org.apache.catalina.core.StandardContext.start(StandardContext.java:4357)rn at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:823)rn at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:807)rn at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:595)rn at org.apache.catalina.core.StandardHostDeployer.addChild(StandardHostDeployer.java:903)rn at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)rn at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)rn at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)rn at java.lang.reflect.Method.invoke(Method.java:585)rn at org.apache.commons.beanutils.MethodUtils.invokeMethod(MethodUtils.java:216)rn at org.apache.commons.digester.SetNextRule.end(SetNextRule.java:256)rn at org.apache.commons.digester.Rule.end(Rule.java:276)rn at org.apache.commons.digester.Digester.endElement(Digester.java:1058)rn at org.apache.catalina.util.CatalinaDigester.endElement(CatalinaDigester.java:76)rn at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)rn at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)rn at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)rn at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)rn at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)rn at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)rn at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)rn at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)rn at org.apache.commons.digester.Digester.parse(Digester.java:1567)rn at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:488)rn at org.apache.catalina.core.StandardHost.install(StandardHost.java:863)rn at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:483)rn at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:427)rn at org.apache.catalina.startup.HostConfig.start(HostConfig.java:983)rn at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:349)rn at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)rn at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1091)rn at org.apache.catalina.core.StandardHost.start(StandardHost.java:789)rn at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)rn at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:478)rn at org.apache.catalina.core.StandardService.start(StandardService.java:480)rn at org.apache.catalina.core.StandardServer.start(StandardServer.java:2313)rn at org.apache.catalina.startup.Catalina.start(Catalina.java:556)rn at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)rn at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)rn at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)rn at java.lang.reflect.Method.invoke(Method.java:585)rn at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:287)rn at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425)rn
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