自动图片播放器（AdapterViewFlipper）

李小白是一只喵

发布于 2020-04-24 08:41:36

1.1K0

发布于 2020-04-24 08:41:36

文章被收录于专栏：算法微时光

image.png

AdapterViewFlipper

AdapterViewFilpper 继承了AdapterViewAnimator，它也会显示 Adapter 提供的多个 View 组件，但它每次只能显示一个View组件，程序可通过showPrevious()和showNext()方法控制该组件显示上一个、下一个组件。

实战

xml文件

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <AdapterViewFlipper
        android:id="@+id/afilper"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:flipInterval="5000"
        tools:layout_editor_absoluteX="0dp"
        tools:layout_editor_absoluteY="0dp" />

    <Button
        android:id="@+id/prev"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="5dp"
        android:layout_marginLeft="5dp"
        android:layout_marginTop="5dp"
        android:layout_marginEnd="291dp"
        android:layout_marginRight="291dp"
        android:text="上一个"
        android:onClick="prev"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toEndOf="@+id/afilper"
        app:layout_constraintTop_toBottomOf="@+id/afilper"
        app:layout_constraintVertical_bias="0.924" />

    <Button
        android:id="@+id/auto"
        android:layout_width="wrap_content"
        android:layout_height="64dp"
        android:layout_marginStart="22dp"
        android:layout_marginLeft="22dp"
        android:layout_marginTop="4dp"
        android:layout_marginEnd="155dp"
        android:layout_marginRight="155dp"
        android:text="自动播放"
        android:onClick="auto"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toEndOf="@+id/afilper"
        app:layout_constraintTop_toBottomOf="@+id/afilper"
        app:layout_constraintVertical_bias="0.705" />

    <Button
        android:id="@+id/next"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="200dp"
        android:layout_marginLeft="200dp"
        android:layout_marginTop="456dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginBottom="7dp"
        android:text="下一个"
        android:onClick="next"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="1.0" />

</android.support.constraint.ConstraintLayout>

代码文件

package com.example.user.picture;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterViewFlipper;
import android.widget.BaseAdapter;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

    // 图片资源
    int[] picture = new int[]{R.drawable.p001,R.drawable.p002,
            R.drawable.p003,R.drawable.p004};
    AdapterViewFlipper flipper;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 获取AdapterViewFlipper
        flipper = (AdapterViewFlipper)findViewById(R.id.afilper);

        //　为获取AdapterViewFlipper添加适配器
        BaseAdapter adapter = new BaseAdapter() {
            @Override
            public int getCount() {
                return picture.length;
            }

            @Override
            public Object getItem(int position) {
                return position;
            }

            @Override
            public long getItemId(int position) {
                return position;
            }

            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                //　创建图片控件
                ImageView imageview = new ImageView(MainActivity.this);
                //　为控件添加资源
                imageview.setImageResource(picture[position]);

                imageview.setScaleType(ImageView.ScaleType.FIT_XY);

                imageview.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                        ViewGroup.LayoutParams.MATCH_PARENT));

                return imageview;
            }
        };

        flipper.setAdapter(adapter);
    }

    // 设定按钮函数
    public void prev(View source){
        flipper.showPrevious();
        flipper.stopFlipping();
    }

    // 设定按钮函数
    public void next(View source){
        flipper.showNext();
        flipper.stopFlipping();
    }

    // 设定按钮函数
    public void auto(View source){
        flipper.startFlipping();
    }
}