android.view.InflateException：二进制XML文件行＃47：错误导致类未知

Question

我是Android的新手，并试图制作简单的应用程序。我正在尝试在Android设备上运行我的应用程序，但它正在崩溃evrytime。请帮忙。

这是我的清单文件。

<?xml version="1.0" encoding="utf-8"?>

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        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=".Inspection"
        android:label="@string/title_activity_inspection"
        android:parentActivityName=".MainActivity">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value=".MainActivity" />
    </activity>
</application>

主要活动类

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}
public void onClickemergency(View view){
    Intent intent = new Intent(this, Inspection.class);
    startActivity(intent);
}

}

主要活动Xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:background="#ffffff"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity">

<Button
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="#ff2629"
    android:text="@string/breaks"
    android:drawableRight="@drawable/news"
    android:id="@+id/button"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:textColor="#ffffff"
    android:textSize="20dp"
    android:paddingEnd="20dp"
    android:onClick="onClickemergency"/>

<ImageView
    android:layout_width="fill_parent"
    android:layout_height="150dp"
    android:id="@+id/imageView"
    android:src="@drawable/check"
    android:layout_below="@+id/button"
    android:layout_centerHorizontal="true" />

<Button
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/checks"
    android:background="#1B9AF7"
    android:textColor="#ffffff"
    android:id="@+id/button2"
    android:layout_below="@+id/imageView"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:textSize="20sp"/>

<ImageView
    android:layout_width="fill_parent"
    android:layout_height="150dp"
    android:id="@+id/imageView2"
    android:src="@drawable/bev"
    android:layout_above="@+id/button3"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<Button
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="#1B9AF7"
    android:textColor="#ffffff"
    android:text="@string/pap"
    android:textSize="20sp"
    android:id="@+id/button3"
    android:layout_alignParentBottom="true"
  enter code here  android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

Logcat文件

Unable to start activity ComponentInfo{com.androidbegin.carpiko/com.androidbegin.carpiko.MainActivity}: android.view.InflateException: Binary XML file line #47: Error inflating class <unknown>
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2192)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2241)
        at android.app.ActivityThread.access$800(ActivityThread.java:141)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1204)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:5049)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
        at dalvik.system.NativeStart.main(Native Method)