直播软件开发Android项目之视频播放器

视频播放
1）VideoView控件播放视频
VideoView控件是播放视频用的，借助它可以完成一个简易的视频播放器。
①在activity_main.xml中编写相应的控件

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity">    <ImageView        android:id="@+id/bt_play"        android:layout_width="80dp"        android:layout_height="80dp"        android:layout_alignParentBottom="true"        android:layout_centerHorizontal="true"        android:layout_marginBottom="150dp"        android:src="@android:drawable/ic_media_play" />    <VideoView        android:id="@+id/videoview"        android:layout_width="match_parent"        android:layout_height="match_parent" /></RelativeLayout>

②在MainActivity实现SeekBar.OnSeekChangeListener接口与SurfaceHolder.Callback接口，并重写这两个接口中对应的方法，在这些方法中实现播放视频的。

package com.example.videoview;import android.media.MediaPlayer;import android.net.Uri;import android.os.Bundle;import android.view.View;import android.widget.ImageView;import android.widget.MediaController;import android.widget.VideoView;import androidx.appcompat.app.AppCompatActivity;public class MainActivity extends AppCompatActivity implements        View.OnClickListener {    private VideoView videoView;    private MediaController controller;    ImageView iv_play;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        videoView = (VideoView) findViewById(R.id.videoview);        iv_play = (ImageView) findViewById(R.id.bt_play);        //拼出在资源文件夹下的视频文件路径String字符串        String url = "android.resource://" + getPackageName() + "/" + R.raw.video;        //字符串解析成Uri        Uri uri = Uri.parse(url);        //设置videoview的播放资源        videoView.setVideoURI(uri);        //VideoView绑定控制器        controller = new MediaController(this);        videoView.setMediaController(controller);        iv_play.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.bt_play:                play();                break;        }    }    // 播放视频    private void play() {        if (videoView != null && videoView.isPlaying()) {            iv_play.setImageResource(android.R.drawable.ic_media_play);            videoView.stopPlayback();            return;        }        videoView.start();        iv_play.setImageResource(android.R.drawable.ic_media_pause);        videoView.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {            @Override            public void onCompletion(MediaPlayer mp) {                iv_play.setImageResource(android.R.drawable.ic_media_play);            }        });    }}

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