在线直播系统源码，多图加载成动画的形式如何实现

在线直播系统源码，多图加载成动画的形式如何实现

1、设置

animationDrawable.addFrame(drawable, 1000);//添加图片生成的drawable，时间为1000ms
animationDrawable.setOneShot(false);//设置是否播放一次，false表示会一直循环播放
animationDrawable.setEnterFadeDuration(200);//进入时动画前摇时间，时间为200ms
animationDrawable.setExitFadeDuration(200);//退出时动画后摇时间，时间为200ms

​初始化和图片资源设置完成后

animationDrawable.start();

2、停止播放

animationDrawable.stop();

3、全部代码

package com.mz.demo.ui.home;
 
import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.AnimationDrawable;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Environment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
 
import com.mz.demo.databinding.FragmentHomeBinding;
 
import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
 
import androidx.annotation.NonNull;
import androidx.core.app.ActivityCompat;
import androidx.fragment.app.Fragment;
 
public class HomeFragment extends Fragment {
    private Activity activity;
    private FragmentHomeBinding binding;
    private AnimationDrawable animationDrawable;
    private final List<String> uriList = new ArrayList<>();
 
    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {
        activity = getActivity();
 
        binding = FragmentHomeBinding.inflate(inflater, container, false);
        return binding.getRoot();
    }
 
    @Override
    public void onStart() {
        super.onStart();
        requestPermission();
    }
 
    @Override
    public void onStop() {
        super.onStop();
        if (animationDrawable != null) {
            animationDrawable.stop();
            animationDrawable = null;//置空释放资源
        }
    }
 
    private void requestPermission() {
        //读取SD权限申请
        if (activity.checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 1);
        }
        readImagePath();
    }
 
    private void readImagePath() {
        uriList.clear();
        //获取该路径下所有文件
        File file = new File(Environment.getExternalStorageDirectory() + "/DCIM/demo");
        String[] paths = file.list();
        if (paths == null)
            return;
        uriList.addAll(Arrays.asList(paths));
        animationDrawable = new AnimationDrawable();
        for (String uri : uriList) {
            Bitmap bitmap = BitmapFactory.decodeFile(file + "/" + uri);
            Drawable drawable = new BitmapDrawable(null, bitmap);
            animationDrawable.addFrame(drawable, 1000);
            animationDrawable.setOneShot(false);
            animationDrawable.setEnterFadeDuration(200);
            animationDrawable.setExitFadeDuration(200);
            binding.imageView.setImageDrawable(animationDrawable);
            animationDrawable.start();
        }
    }
 
    @Override
    public void onDestroyView() {
        super.onDestroyView();
        binding = null;
    }
}
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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=".ui.home.HomeFragment">
 
    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintDimensionRatio="16:9"
        android:layout_margin="30dp"
        app:layout_constraintTop_toTopOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>

这里的图片资源是是从SD卡的文件夹下加载的，也可以换成网络图片。

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