Android Studio Development Basics using the XML and Java Code hybrid control UI interface

<linearlayout xmlns:android= "http://schemas.android.com/apk/res/android"    xmlns:tools= "http// Schemas.android.com/tools "android:layout_width=" match_parent "    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 "    android:orientation=" vertical "    android:background=" @drawable/bg "android:id="    @+id/ Layout "></LinearLayout>

Package Com.example.lhb.contentprovider1;import Android.app.actionbar;import Android.app.activity;import Android.content.contentresolver;import Android.database.cursor;import Android.graphics.color;import Android.provider.contactscontract;import Android.support.v7.app.actionbaractivity;import Android.os.Bundle; Import Android.util.typedvalue;import android.view.menu;import Android.view.menuitem;import Android.view.ViewGroup ; Import Android.widget.framelayout;import Android.widget.imageview;import Android.widget.linearlayout;import Android.widget.textview;public class Mainactivity extends Activity {@Override protected void onCreate (Bundle savedi        Nstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.activity_main);        LinearLayout ll= (linearlayout) Findviewbyid (r.id.layout);        ImageView []img=new imageview[4];        int []imgsource=new int[]{r.drawable.pic1,r.drawable.pic2,r.drawable.pic3,r.drawable.pic4}; for (iNT i=0;i

Android Studio Development Basics using the XML and Java Code hybrid control UI interface