Android登陆背景动画效果

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废话少说，直接上代码：

自定义的CustomVideoView(VideoView):

import android.content.Context;
import android.media.MediaPlayer;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.widget.VideoView;

public class CustomVideoView extends VideoView {

    public CustomVideoView(Context context) {
        super(context);
    }

    public CustomVideoView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomVideoView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        //我们重新计算高度
        int width = getDefaultSize(0, widthMeasureSpec);
        int height = getDefaultSize(0, heightMeasureSpec);
        setMeasuredDimension(width, height);
    }

    @Override
    public void setOnPreparedListener(MediaPlayer.OnPreparedListener l) {
        super.setOnPreparedListener(l);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        return super.onKeyDown(keyCode, event);
    }
}

LoginActivity:

public class LoginActivity extends AppCompatActivity implements View.OnClickListener {

    private CustomVideoView videoView;

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

    /**
     * 初始化
     */
    private void initView() {
        Button btn_enter = findViewById(R.id.btn_enter);
        btn_enter.setOnClickListener(this);

        videoView = findViewById(R.id.videoView);
        videoView.setVideoURI(Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.sport));

        //播放
        videoView.start();
        //循环播放
        videoView.setOnCompletionListener(mediaPlayer -> videoView.start());

    }

    @Override
    public void onClick(View view) {
        if (view.getId() == R.id.btn_enter) {
            Toast.makeText(this, "登录成功了", Toast.LENGTH_SHORT).show();
        }
    }
}

activity_login.xml:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:fitsSystemWindows="true"
    android:layout_height="match_parent">

    <com.hjy.mygradle.utils.CustomVideoView
        android:id="@+id/videoView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="top"
        android:orientation="vertical">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="38dp"
            android:layout_marginTop="70dp"
            android:layout_marginRight="38dp"
            android:orientation="vertical">

            <EditText
                android:id="@+id/etPhone"
                android:layout_width="match_parent"
                android:layout_height="40dp"
                android:layout_gravity="center_vertical"
                android:background="@null"
                android:digits="0123456789"
                android:gravity="center_vertical"
                android:hint="请输入手机号"
                android:inputType="number"
                android:maxLength="11"
                android:maxLines="1"
                android:paddingStart="5dp"
                android:textColor="@android:color/white"
                android:textColorHint="@android:color/white"
                android:textSize="18sp"
                tools:ignore="RtlSymmetry,TextFields" />

            <View
                android:layout_width="match_parent"
                android:layout_height="1dp"
                android:background="@color/horizontal_line" />

            <EditText
                android:id="@+id/et_pwd"
                android:layout_width="match_parent"
                android:layout_height="40dp"
                android:layout_marginTop="20dp"
                android:background="@null"
                android:gravity="center_vertical"
                android:hint="@string/etPassWord"
                android:inputType="textPassword"
                android:maxLength="11"
                android:maxLines="1"
                android:paddingStart="5dp"
                android:textColor="@android:color/white"
                android:textColorHint="@android:color/white"
                android:textSize="18sp"
                tools:ignore="RtlSymmetry" />

            <View
                android:layout_width="match_parent"
                android:layout_height="1dp"
                android:background="@color/horizontal_line" />

        </LinearLayout>

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="23dp"
            android:layout_marginRight="23dp"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/tv_register"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="15dp"
                android:text="快速注册"
                android:textColor="@color/greens" />

            <TextView
                android:id="@+id/tv_find_pwd"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentTop="true"
                android:layout_alignParentEnd="true"
                android:gravity="right"
                android:padding="15dp"
                android:text="忘记密码?"
                android:textColor="@color/greens" />

        </RelativeLayout>

        <Button
            android:id="@+id/btn_enter"
            style="?android:attr/borderlessButtonStyle"
            android:layout_width="match_parent"
            android:layout_height="45dp"
            android:layout_gravity="center_horizontal"
            android:layout_marginLeft="30dp"
            android:layout_marginTop="20dp"
            android:layout_marginRight="30dp"
            android:background="@drawable/shape_green_content_normal"
            android:text="登录"
            android:textColor="@color/white"
            android:textSize="18dp" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:orientation="vertical"
        android:paddingBottom="30dp">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="90dp"
            android:gravity="center"
            android:text="使用第三方登录"
            android:textColor="@color/white"
            android:textSize="16dp"
            android:visibility="visible" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center_horizontal"
            android:orientation="horizontal">


            <ImageView
                android:id="@+id/iv_wechat"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:padding="10dp"
                android:src="@drawable/qq_sel" />

            <ImageView
                android:id="@+id/iv_qq"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginStart="20dp"
                android:layout_marginTop="10dp"
                android:padding="10dp"
                android:src="@drawable/wechat_sel" />

        </LinearLayout>
    </LinearLayout>
</FrameLayout>

在res下创建一个raw文件夹，把准备好的视频（mp4文件）拷贝到该文件夹下面。