android 应用在启动后进行全局的的初始化操作

package com.wzh.app;

import com.wzh.volley.WzhVolley;
import android.app.Application;
import android.util.Log;

public class WzhShshtApp extends Application{
@Override
public void onCreate() {
super.onCreate();
Log.i("+++++++++++","*******");
init();
}

private void init() {
WzhVolley.init(this);
}
}

<application
android:name="com.wzh.app.WzhShshtApp"
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@android:style/Theme.Holo.Light" >