加速度计类的Android问题

概述我试图将我的加速度计类嵌入我的secondeActivity中,但是我总是遇到强制异常这是我的加速度计课：packagecom.example.lincision;importandroid.hardware.Sensor;importandroid.hardware.SensorEvent;importandroid.hardware.SensorEventListener;publicclassAccelerom

我试图将我的加速度计类嵌入我的secondeActivity中,但是我总是遇到强制异常
这是我的加速度计课：

package com.example.lincision;import androID.harDWare.Sensor;import androID.harDWare.SensorEvent;import androID.harDWare.SensorEventListener;public class Accelerometer implements SensorEventListener {    private float xAxis;    private float yAxis;    private float zAxis;    private float lastX, lastY, lastZ;    public float getX() {        return this.xAxis;    }    public float getY() {        return this.yAxis;    }    public float getZ() {        return this.zAxis;    }    @OverrIDe    public voID onAccuracyChanged(Sensor sensor, int accuracy) {    }    @OverrIDe    public voID onSensorChanged(SensorEvent event) {        // get the change of the x,y,z values of the accelerometer        xAxis = Math.abs(lastX - event.values[0]);        yAxis = Math.abs(lastY - event.values[1]);        zAxis = Math.abs(lastZ - event.values[2]);    }}

在这里,您看到我的第二活动根本没有用,也许是我的主意
必须改变.

package com.example.lincision;import androID.app.Activity;import androID.content.Context;import androID.harDWare.Sensor;import androID.harDWare.SensorEventListener;import androID.harDWare.SensorManager;import androID.os.Bundle;import androID.Widget.TextVIEw;import com.javacodegeeks.androIDaccelerometerexample.R;public class SecondActivity extends Activity {    TextVIEw outputX;    TextVIEw outputY;    TextVIEw outputZ;    SensorManager manager;    Sensor accelerometer;    SensorManager sensorManager;    TextVIEw currentX, currentY, currentZ;    @OverrIDepublic voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.secondactivity);    initializeVIEws();    displayCleanValues();    // display the current x,y,z accelerometer values    displayCurrentValues();    sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);    accelerometer = sensorManager            .getDefaultSensor(Sensor.TYPE_ACCELEROMETER);    sensorManager.registerListener((SensorEventListener) acc,            accelerometer, SensorManager.SENSOR_DELAY_norMAL);}    Accelerometer acc = new Accelerometer();    public voID initializeVIEws() {        currentX = (TextVIEw) findVIEwByID(R.ID.currentX);        currentY = (TextVIEw) findVIEwByID(R.ID.currentY);        currentZ = (TextVIEw) findVIEwByID(R.ID.currentZ);    }    private float deltaX = acc.getX();    private float deltaY = acc.getY();    private float deltaZ = acc.getZ();    public voID displayCleanValues() {        currentX.setText("0.0");        currentY.setText("0.0");        currentZ.setText("0.0");    }    // display the current x,y,z accelerometer values    public voID displayCurrentValues() {        currentX.setText(float.toString(deltaX));        currentY.setText(float.toString(deltaY));        currentZ.setText(float.toString(deltaZ));    }}

这是我的错误信息：

01-14 12:36:58.751: E/AndroIDRuntime(18696): java.lang.RuntimeException: Unable to start activity       ComponentInfo{com.javacodegeeks.androIDaccelerometerexample/com.example.lincision.SecondActivity}:      java.lang.classCastException: com.example.lincision.SecondActivity cannot be cast to androID.harDWare.SensorEventListener01-14 12:36:58.751: E/AndroIDRuntime(18696):    at androID.app.ActivityThread.performlaunchActivity(ActivityThread.java:2394)01-14 12:36:58.751: E/AndroIDRuntime(18696):    at androID.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2452)01-14 12:36:58.751: E/AndroIDRuntime(18696):    at androID.app.ActivityThread.access0(ActivityThread.java:172)01-14 12:36:58.751: E/AndroIDRuntime(18696):    at androID.app.ActivityThread$H.handleMessage(ActivityThread.java:1302)01-14 12:36:58.751: E/AndroIDRuntime(18696):    at androID.os.Handler.dispatchMessage(Handler.java:102)01-14 12:36:58.751: E/AndroIDRuntime(18696):    at androID.os.Looper.loop(Looper.java:136)01-14 12:36:58.751: E/AndroIDRuntime(18696):    at androID.app.ActivityThread.main(ActivityThread.java:5586)01-14 12:36:58.751: E/AndroIDRuntime(18696):    at java.lang.reflect.Method.invokeNative(Native Method)01-14 12:36:58.751: E/AndroIDRuntime(18696):    at java.lang.reflect.Method.invoke(Method.java:515)01-14 12:36:58.751: E/AndroIDRuntime(18696):    at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)01-14 12:36:58.751: E/AndroIDRuntime(18696):    at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:1084)01-14 12:36:58.751: E/AndroIDRuntime(18696):    at dalvik.system.NativeStart.main(Native Method)01-14 12:36:58.751: E/AndroIDRuntime(18696): Caused by: java.lang.classCastException: com.example.lincision.SecondActivity cannot be cast to androID.harDWare.SensorEventListener

解决方法:

SensorManager.registerListener将SensorEventListener对象作为参数,并且您没有在SecondActivity中实现SensorEventListener.

因为您要在Accelerometer中实现SensorEventListener,所以将acc作为第一个参数传递给registerListener：

sensorManager.registerListener((SensorEventListener)acc, accelerometer,                SensorManager.SENSOR_DELAY_norMAL);

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