이 예는 RecyclerView 항목이 화면에 나타날 때 애니메이션을 적용하는 방법을 보여줍니다.
1단계 − Android Studio에서 새 프로젝트를 생성하고 파일 ⇒ 새 프로젝트로 이동하여 필요한 모든 세부 정보를 입력하여 새 프로젝트를 생성합니다.
2단계 − res/layout/activity_main.xml에 다음 코드를 추가합니다.
<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="https://schemas.android.com/apk/res/android" xmlns:app="https://schemas.android.com/apk/res-auto" xmlns:tools="https://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <android.support.v7.widget.RecyclerView android:id="@+id/recyclerView" android:layout_width="match_parent" android:layout_height="wrap_content" android:layoutAnimation="@anim/layout_animation_up_to_down" app:layoutManager="android.support.v7.widget.LinearLayoutManager" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" /> <android.support.design.widget.FloatingActionButton android:id="@+id/fab" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="8dp" android:src="@android:drawable/ic_media_next" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintRight_toRightOf="parent" /> </android.support.constraint.ConstraintLayout>
3단계 − res/anim/down_to_up.xml에 다음 코드를 추가합니다.
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="https://schemas.android.com/apk/res/android" android:duration="500"> <translate android:fromYDelta="50%p" android:interpolator="@android:anim/accelerate_decelerate_interpolator" android:toYDelta="0" /> <alpha android:fromAlpha="0" android:interpolator="@android:anim/accelerate_decelerate_interpolator" android:toAlpha="1" /> </set>
4단계 − res/anim/left_to_right.xml에 다음 코드를 추가합니다.
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="https://schemas.android.com/apk/res/android" android:duration="500"> <translate android:fromXDelta="-100%p" android:interpolator="@android:anim/decelerate_interpolator" android:toXDelta="0" /> <alpha android:fromAlpha="0.5" android:interpolator="@android:anim/accelerate_decelerate_interpolator" android:toAlpha="1" /> </set>
5단계 − res/anim/right_to_left.xml에 다음 코드를 추가합니다.
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="https://schemas.android.com/apk/res/android" android:duration="500"> <translate android:fromXDelta="100%p" android:interpolator="@android:anim/decelerate_interpolator" android:toXDelta="0" /> <alpha android:fromAlpha="0.5" android:interpolator="@android:anim/accelerate_decelerate_interpolator" android:toAlpha="1" /> </set>
6단계 − res/anim/up_to_down.xml에 다음 코드를 추가합니다.
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="https://schemas.android.com/apk/res/android" android:duration="500"> <translate android:fromYDelta="-25%" android:interpolator="@android:anim/decelerate_interpolator" android:toYDelta="0" /> <alpha android:fromAlpha="0" android:interpolator="@android:anim/decelerate_interpolator" android:toAlpha="1" /> <scale android:fromXScale="125%" android:fromYScale="125%" android:interpolator="@android:anim/decelerate_interpolator" android:pivotX="50%" android:pivotY="50%" android:toXScale="100%" android:toYScale="100%" /> </set>
7단계 − res/anim/layout_animation_down_to_up.xml에 다음 코드를 추가합니다.
<?xml version="1.0" encoding="utf-8"?> <layoutAnimation xmlns:android="https://schemas.android.com/apk/res/android" android:animation="@anim/down_to_up" android:animationOrder="normal" android:delay="15%" />
8단계 − res/anim/layout_animation_left_to_right.xml에 다음 코드 추가
<?xml version="1.0" encoding="utf-8"?> <layoutAnimation xmlns:android="https://schemas.android.com/apk/res/android" android:animation="@anim/left_to_right" android:animationOrder="normal" android:delay="15%" />
9단계 − res/anim/layout_animation_right_to_left.xml에 다음 코드 추가
<?xml version="1.0" encoding="utf-8"?> <layoutAnimation xmlns:android="https://schemas.android.com/apk/res/android" android:animation="@anim/right_to_left" android:animationOrder="normal" android:delay="15%" />
10단계 − res/anim/layout_animation_up_to_down.xml에 다음 코드 추가
<?xml version="1.0" encoding="utf-8"?> <layoutAnimation xmlns:android="https://schemas.android.com/apk/res/android" android:animation="@anim/up_to_down" android:animationOrder="normal" android:delay="15%" />
11단계 − src/MainActivity.java
에 다음 코드 추가package com.journaldev.androidrecyclerviewlayoutanimation;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.view.animation.AnimationUtils;
import android.view.animation.GridLayoutAnimationController;
import android.view.animation.LayoutAnimationController;
import android.widget.Spinner;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
FloatingActionButton fab;
RecyclerView recyclerView;
RecyclerViewAdapter recyclerViewAdapter;
ArrayList<String>> arrayList = new ArrayList<>();
int[] animationList = {R.anim.layout_animation_up_to_down,
R.anim.layout_animation_right_to_left,
R.anim.layout_animation_down_to_up,
R.anim.layout_animation_left_to_right};
int i = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fab = findViewById(R.id.fab);
recyclerView = findViewById(R.id.recyclerView);
populateData();
initAdapter();
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (i < animationList.length - 1) {
i++;
} else {
i = 0;
}
runAnimationAgain();
}
});
}
private void populateData() {
for (int i = 0; i < 12; i++) {
arrayList.add("Item " + i);
}
}
private void initAdapter() {
recyclerViewAdapter = new RecyclerViewAdapter(arrayList);
recyclerView.setAdapter(recyclerViewAdapter);
}
private void runAnimationAgain() {
final LayoutAnimationController controller = AnimationUtils.loadLayoutAnimation(this, animationList[i]);
recyclerView.setLayoutAnimation(controller);
recyclerViewAdapter.notifyDataSetChanged();
recyclerView.scheduleLayoutAnimation();
}
} 12단계 − Manifests/AndroidManifest.xml에 다음 코드 추가
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="https://schemas.android.com/apk/res/android" package="com.journaldev.androidrecyclerviewlayoutanimation"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
응용 프로그램을 실행해 보겠습니다. 실제 Android 모바일 장치를 컴퓨터에 연결했다고 가정합니다. Android 스튜디오에서 앱을 실행하려면 프로젝트의 활동 파일 중 하나를 열고 도구 모음에서 실행 아이콘을 클릭합니다. 모바일 장치를 옵션으로 선택한 다음 기본 화면을 표시할 모바일 장치를 확인하십시오 -
