【Exoplayer】简单使用Exoplayer

1.目的

本文的目的是记录简单创建一个基于Exoplayer的视频播放软件的最小代码单元，并生成可以使用的APK应用软件。通过本文的代码，能够使用exoplayer播放一个SD卡的本地文件。
本文使用的代码：
Github地址

2.工程文件配置

代码基于Android Studio创建的工程，Android 5.0版本 API21（项目需要所以版本较老）。
编译：直接使用菜单栏Run运行MainActivity，然后使用Build APKs生成开发者调试的debug版本的APK。随后，将apk推到需要测试的安卓系统板子上，测试APK是否好用。

3.代码目录

在这里插入图片描述

4.需要改动配置的文件

MainActivity。
Gradle下面的文件。

在build.gradle(module)里面需要补充程序对Android包的依赖、SDK版本信息、Java版本

plugins {
    
    
    id 'com.android.application'
}

android {
    
    
    namespace 'com.example.exoplayer2example'
    compileSdk 32

    defaultConfig {
    
    
        applicationId "com.example.exoplayer2example"
        minSdk 21
        targetSdk 32
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
    
    
        release {
    
    
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
    
    
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    buildFeatures {
    
    
        viewBinding true
    }
}

dependencies {
    
    
    implementation 'com.google.android.exoplayer:exoplayer:r2.0.0'
    implementation 'androidx.appcompat:appcompat:1.5.1'
    implementation 'com.google.android.material:material:1.6.1'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
    implementation 'androidx.navigation:navigation-fragment:2.5.2'
    implementation 'androidx.navigation:navigation-ui:2.5.2'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}

settings.gradle

pluginManagement {
    
    
    repositories {
    
    
        gradlePluginPortal()
        google()
        mavenCentral()
    }
}
dependencyResolutionManagement {
    
    
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
    
    
        google()
        mavenCentral()
        jcenter()
    }
}
rootProject.name = "Exoplayer2Example"
include ':app'

res 生成的文件
包括各种图标、xml等。
AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

    <application
        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"

        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true"
            android:label="@string/app_name"
            android:theme="@style/AppTheme">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

            <meta-data
                android:name="android.app.lib_name"
                android:value="" />
        </activity>
    </application>

</manifest>

5.MainActivity

package com.example.exoplayer2example;

import android.annotation.SuppressLint;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;

import androidx.appcompat.app.AppCompatActivity;

import com.google.android.exoplayer2.DefaultLoadControl;
import com.google.android.exoplayer2.ExoPlaybackException;
import com.google.android.exoplayer2.ExoPlayer;
import com.google.android.exoplayer2.ExoPlayerFactory;
import com.google.android.exoplayer2.LoadControl;
import com.google.android.exoplayer2.SimpleExoPlayer;
import com.google.android.exoplayer2.Timeline;
import com.google.android.exoplayer2.extractor.DefaultExtractorsFactory;
import com.google.android.exoplayer2.extractor.ExtractorsFactory;
import com.google.android.exoplayer2.source.ExtractorMediaSource;
import com.google.android.exoplayer2.source.LoopingMediaSource;
import com.google.android.exoplayer2.source.MediaSource;
import com.google.android.exoplayer2.source.hls.HlsMediaSource;
import com.google.android.exoplayer2.trackselection.AdaptiveVideoTrackSelection;
import com.google.android.exoplayer2.trackselection.DefaultTrackSelector;
import com.google.android.exoplayer2.trackselection.TrackSelection;
import com.google.android.exoplayer2.trackselection.TrackSelector;
import com.google.android.exoplayer2.ui.SimpleExoPlayerView;
import com.google.android.exoplayer2.upstream.BandwidthMeter;
import com.google.android.exoplayer2.upstream.DefaultBandwidthMeter;
import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory;
import com.google.android.exoplayer2.util.Util;

public class MainActivity extends AppCompatActivity {
    
    

    private static final String TAG = "MainActivity";
    private SimpleExoPlayerView simpleExoPlayerView;
    private SimpleExoPlayer player;
    private ExoPlayer.EventListener exoPlayerEventListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
    
        super.onCreate(savedInstanceState);

        Log.v(TAG,"starting...");
        setContentView(R.layout.activity_main);
// 1. Create a default TrackSelector
        Handler mainHandler = new Handler();
        BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
        TrackSelection.Factory videoTrackSelectionFactory = new AdaptiveVideoTrackSelection.Factory(bandwidthMeter);
        TrackSelector trackSelector = new DefaultTrackSelector(mainHandler, videoTrackSelectionFactory);
// 2. Create a default LoadControl
        LoadControl loadControl = new DefaultLoadControl();
// 3. Create the player
        Log.v(TAG,"create the player");
        player = ExoPlayerFactory.newSimpleInstance(this, trackSelector, loadControl);
//4. Create view
        simpleExoPlayerView = new SimpleExoPlayerView(this);
        simpleExoPlayerView = (SimpleExoPlayerView) findViewById(R.id.player_view);
        // Set media controller
        simpleExoPlayerView.setUseController(true);
        simpleExoPlayerView.requestFocus();
        // Bind the player to the view.
        simpleExoPlayerView.setPlayer(player);
//6. building cam live stream link:
        Log.v(TAG,"parse url");
        @SuppressLint("SdCardPath")
        String myUrl = "/data/sample_Trim.mp4";
        Uri mp4VideoUri = Uri.parse(myUrl);
        Log.v(TAG, String.valueOf(mp4VideoUri));
        Log.v(TAG,"parse url end");

//Measures bandwidth during playback. Can be null if not required.
        DefaultBandwidthMeter bandwidthMeterA = new DefaultBandwidthMeter();
//Produces DataSource instances through which media data is loaded.
//DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(this, Util.getUserAgent(this, "exoplayer2example"), bandwidthMeterA);
        DefaultDataSourceFactory dataSourceFactory = new DefaultDataSourceFactory(this, Util.getUserAgent(this, "exoplayer2example"), bandwidthMeterA);

//Produces Extractor instances for parsing the media data.
        ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();

//This is the MediaSource representing the media to be played:
//FOR SD CARD SOURCE:
        MediaSource videoSource = new ExtractorMediaSource(mp4VideoUri, dataSourceFactory, extractorsFactory, null, null);

//FOR LIVESTREAM LINK:
        //MediaSource videoSource = new HlsMediaSource(mp4VideoUri, dataSourceFactory, 1, null, null);
        final LoopingMediaSource loopingSource = new LoopingMediaSource(videoSource);

// Prepare the player with the source.
        player.setPlayWhenReady(true);
        player.prepare(loopingSource);

        player.addListener(new ExoPlayer.EventListener() {
    
    
            @Override
            public void onLoadingChanged(boolean isLoading) {
    
    
                Log.v(TAG,"Listener-onLoadingChanged...");
            }

            @Override
            public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
    
    
                Log.v(TAG,"Listener-onPlayerStateChanged...");
            }

            @Override
            public void onTimelineChanged(Timeline timeline, Object manifest) {
    
    
                Log.v(TAG,"Listener-onTimelineChanged...");
            }

            @Override
            public void onPlayerError(ExoPlaybackException error) {
    
    
                Log.v(TAG,"Listener-onPlayerError...");
                player.stop();
                player.prepare(loopingSource);
                player.setPlayWhenReady(true);
            }

            @Override
            public void onPositionDiscontinuity() {
    
    
                Log.v(TAG,"Listener-onPositionDiscontinuity...");
            }
        });

    }//End of onCreate


    @Override
    protected void onStop() {
    
    
        super.onStop();
        Log.v(TAG,"onStop()...");
    }

    @Override
    protected void onStart() {
    
    
        super.onStart();
        Log.v(TAG,"onStart()...");

    }

    @Override
    protected void onResume() {
    
    
        super.onResume();
        Log.v(TAG,"onResume()...");
    }

    @Override
    protected void onPause() {
    
    
        super.onPause();
        Log.v(TAG,"onPause()...");
    }

    @Override
    protected void onDestroy() {
    
    
        super.onDestroy();
        Log.v(TAG,"onDestroy()...");
        player.release();

    }
}