소스는 잘 된다. 빌드를 하면 이미지가 두개 없다고 나오는데, 아무거나 가져다 놓고 빌드하면 화면을 볼수 있다.
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<?xml version="1.0" encoding="utf-8"?>
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<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:app="http://schemas.android.com/apk/res-auto"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:background="@color/bg_mainactivity"
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tools:context="example.javatpoint.com.introonetimefirsttime.MainActivity">
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<TextView
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_marginEnd="8dp"
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android:layout_marginStart="8dp"
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android:layout_marginTop="176dp"
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android:textSize="18dp"
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android:text="This is your MainActivity or Home Page"
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android:textColor="@android:color/white"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintHorizontal_bias="0.503"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toTopOf="parent" />
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<Button
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android:id="@+id/btn_click"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_marginBottom="96dp"
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android:layout_marginEnd="8dp"
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android:layout_marginStart="8dp"
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android:text="Button"
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android:onClick="btn_Click"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintHorizontal_bias="0.501"
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app:layout_constraintStart_toStartOf="parent" />
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</android.support.constraint.ConstraintLayout>
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<?xml version="1.0" encoding="utf-8"?>
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:app="http://schemas.android.com/apk/res-auto"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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tools:showIn="@layout/activity_welcome">
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<android.support.v4.view.ViewPager
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android:id="@+id/view_pager"
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android:layout_width="match_parent"
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android:layout_height="match_parent" />
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<LinearLayout
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android:id="@+id/layoutDots"
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android:layout_width="match_parent"
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android:layout_height="@dimen/dots_height"
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android:layout_alignParentBottom="true"
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android:layout_marginBottom="@dimen/dots_margin_bottom"
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android:gravity="center"
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android:orientation="horizontal">
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</LinearLayout>
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<View
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android:layout_width="match_parent"
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android:layout_height="1dp"
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android:alpha=".5"
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android:layout_above="@id/layoutDots"
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android:background="@android:color/white" />
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<Button
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android:id="@+id/btn_next"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_alignParentBottom="true"
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android:layout_alignParentRight="true"
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android:background="@null"
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android:text="@string/next"
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android:textColor="@android:color/white" />
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<Button
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android:id="@+id/btn_skip"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_alignParentBottom="true"
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android:layout_alignParentLeft="true"
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android:background="@null"
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android:text="@string/skip"
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android:textColor="@android:color/white" />
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</RelativeLayout>
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<?xml version="1.0" encoding="utf-8"?>
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:background="@color/bg_screen1">
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<LinearLayout
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_centerInParent="true"
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android:gravity="center_horizontal"
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android:orientation="vertical">
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<ImageView
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android:layout_width="@dimen/img_width_height"
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android:layout_height="@dimen/img_width_height"
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android:src="@drawable/jtp_logo" />
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<TextView
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="@string/slide_1_title"
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android:textColor="@android:color/white"
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android:textSize="@dimen/slide_title"
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android:textStyle="bold" />
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<TextView
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_marginTop="20dp"
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android:paddingLeft="@dimen/desc_padding"
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android:paddingRight="@dimen/desc_padding"
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android:text="@string/slide_1_desc"
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android:textAlignment="center"
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android:textColor="@android:color/white"
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android:textSize="@dimen/slide_desc" />
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</LinearLayout>
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</RelativeLayout>
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<?xml version="1.0" encoding="utf-8"?>
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:background="@color/bg_screen2">
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<LinearLayout
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_centerInParent="true"
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android:gravity="center_horizontal"
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android:orientation="vertical">
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<ImageView
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android:layout_width="@dimen/img_width_height"
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android:layout_height="@dimen/img_width_height"
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android:src="@drawable/image" />
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<TextView
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="@string/slide_2_title"
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android:textColor="@android:color/white"
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android:textSize="@dimen/slide_title"
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android:textStyle="bold" />
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<TextView
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_marginTop="20dp"
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android:paddingLeft="@dimen/desc_padding"
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android:paddingRight="@dimen/desc_padding"
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android:text="@string/slide_2_desc"
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android:textAlignment="center"
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android:textColor="@android:color/white"
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android:textSize="@dimen/slide_desc" />
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</LinearLayout>
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</RelativeLayout>
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package example.javatpoint.com.introonetimefirsttime;
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import android.support.v4.view.ViewPager;
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import android.support.v7.app.AppCompatActivity;
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import android.os.Bundle;
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import android.content.Context;
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import android.content.Intent;
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import android.graphics.Color;
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import android.os.Build;
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import android.support.v4.view.PagerAdapter;
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import android.text.Html;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.view.Window;
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import android.view.WindowManager;
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import android.widget.Button;
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import android.widget.LinearLayout;
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import android.widget.TextView;
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public class WelcomeActivity extends AppCompatActivity {
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private ViewPager viewPager;
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private MyViewPagerAdapter myViewPagerAdapter;
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private LinearLayout dotsLayout;
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private TextView[] dots;
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private int[] layouts;
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private Button btnSkip, btnNext;
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private PrefManager prefManager;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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// Checking for first time launch - before calling setContentView()
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prefManager = new PrefManager(this);
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if (!prefManager.isFirstTimeLaunch()) {
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launchHomeScreen();
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finish();
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}
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// Making notification bar transparent
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if (Build.VERSION.SDK_INT >= 21) {
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getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
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}
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setContentView(R.layout.activity_welcome);
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viewPager = (ViewPager) findViewById(R.id.view_pager);
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dotsLayout = (LinearLayout) findViewById(R.id.layoutDots);
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btnSkip = (Button) findViewById(R.id.btn_skip);
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btnNext = (Button) findViewById(R.id.btn_next);
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// layouts of welcome sliders
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layouts = new int[]{
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R.layout.welcome_slide1,
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R.layout.welcome_slide2
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};
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// adding bottom dots
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addBottomDots(0);
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// making notification bar transparent
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changeStatusBarColor();
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myViewPagerAdapter = new MyViewPagerAdapter();
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viewPager.setAdapter(myViewPagerAdapter);
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viewPager.addOnPageChangeListener(viewPagerPageChangeListener);
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btnSkip.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View v) {
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launchHomeScreen();
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}
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});
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btnNext.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View v) {
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// checking for last page if true launch MainActivity
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int current = getItem(+1);
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if (current < layouts.length) {
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// move to next screen
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viewPager.setCurrentItem(current);
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} else {
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launchHomeScreen();
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}
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}
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});
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}
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private void addBottomDots(int currentPage) {
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dots = new TextView[layouts.length];
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int[] colorsActive = getResources().getIntArray(R.array.array_dot_active);
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int[] colorsInactive = getResources().getIntArray(R.array.array_dot_inactive);
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dotsLayout.removeAllViews();
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for (int i = 0; i < dots.length; i++) {
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dots[i] = new TextView(this);
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dots[i].setText(Html.fromHtml("?"));
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dots[i].setTextSize(35);
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dots[i].setTextColor(colorsInactive[currentPage]);
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dotsLayout.addView(dots[i]);
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}
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if (dots.length > 0)
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dots[currentPage].setTextColor(colorsActive[currentPage]);
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}
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private int getItem(int i) {
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return viewPager.getCurrentItem() + i;
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}
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private void launchHomeScreen() {
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prefManager.setFirstTimeLaunch(false);
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startActivity(new Intent(WelcomeActivity.this, MainActivity.class));
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finish();
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}
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// viewpager change listener
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ViewPager.OnPageChangeListener viewPagerPageChangeListener = new ViewPager.OnPageChangeListener() {
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@Override
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public void onPageSelected(int position) {
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addBottomDots(position);
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// changing the next button text 'NEXT' / 'GOT IT'
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if (position == layouts.length - 1) {
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// last page. make button text to GOT IT
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btnNext.setText(getString(R.string.start));
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btnSkip.setVisibility(View.GONE);
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} else {
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// still pages are left
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btnNext.setText(getString(R.string.next));
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btnSkip.setVisibility(View.VISIBLE);
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}
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}
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@Override
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public void onPageScrolled(int arg0, float arg1, int arg2) {
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}
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@Override
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public void onPageScrollStateChanged(int arg0) {
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}
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};
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// Making notification bar transparent
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private void changeStatusBarColor() {
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
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Window window = getWindow();
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window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
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window.setStatusBarColor(Color.TRANSPARENT);
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}
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}
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/**
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* View pager adapter
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*/
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public class MyViewPagerAdapter extends PagerAdapter {
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private LayoutInflater layoutInflater;
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public MyViewPagerAdapter() {
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}
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@Override
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public Object instantiateItem(ViewGroup container, int position) {
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layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
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View view = layoutInflater.inflate(layouts[position], container, false);
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container.addView(view);
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return view;
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}
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@Override
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public int getCount() {
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return layouts.length;
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}
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@Override
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public boolean isViewFromObject(View view, Object obj) {
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return view == obj;
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}
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@Override
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public void destroyItem(ViewGroup container, int position, Object object) {
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View view = (View) object;
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container.removeView(view);
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}
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}
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}
