我想在Android的图形视图中实时显示设备使用的数据

我想在Android的图形视图中实时显示设备使用的数据。数据应显示在图形视图中。如果有，请提供代码

我在Graph类中使用了这段代码，但在运行时会删除它（bug）

我的舱单

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.totaldata"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="14"
    android:targetSdkVersion="21" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.example.totaldata.Main"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name="com.example.totaldata.MainActivity" />
    <activity android:name="com.example.totaldata.Graph" />
    <activity android:name="com.example.totaldata.ApplicationRunning" />
</application>

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您在logcat中得到的错误是什么？？？@Exception…我得到了整个数据使用情况和每个应用程序数据使用情况，但当我打开图表时，它显示了错误。

05-06 15:21:47.014: E/AndroidRuntime(30815): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.totaldata/com.example.totaldata.Graph}: java.lang.ClassCastException: com.example.totaldata.Graph cannot be cast to android.app.Activity
05-06 15:21:47.014: E/AndroidRuntime(30815):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2121)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at android.app.ActivityThread.startActivityNow(ActivityThread.java:1995)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:135)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:347)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:706)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at android.widget.TabHost.setCurrentTab(TabHost.java:350)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:154)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at android.widget.TabWidget$TabClickListener.onClick(TabWidget.java:540)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at android.view.View.performClick(View.java:3538)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at android.view.View$PerformClick.run(View.java:14330)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at android.os.Handler.handleCallback(Handler.java:608)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at android.os.Handler.dispatchMessage(Handler.java:92)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at android.os.Looper.loop(Looper.java:156)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at android.app.ActivityThread.main(ActivityThread.java:4987)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at java.lang.reflect.Method.invokeNative(Native Method)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at java.lang.reflect.Method.invoke(Method.java:511)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at dalvik.system.NativeStart.main(Native Method)
05-06 15:21:47.014: E/AndroidRuntime(30815): Caused by: java.lang.ClassCastException: com.example.totaldata.Graph cannot be cast to android.app.Activity
05-06 15:21:47.014: E/AndroidRuntime(30815):    at android.app.Instrumentation.newActivity(Instrumentation.java:1039)
05-06 15:21:47.014: E/AndroidRuntime(30815):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2112)

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.totaldata"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="14"
    android:targetSdkVersion="21" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.example.totaldata.Main"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name="com.example.totaldata.MainActivity" />
    <activity android:name="com.example.totaldata.Graph" />
    <activity android:name="com.example.totaldata.ApplicationRunning" />
</application>