java - ExoPlayer 测试 - 无法在未调用 Looper.prepare() 的线程内创建处理程序

Question

我正在尝试测试我创建的实例化新 SimpleExoPlayer 对象的类，这是该类:

public class PlayerFactory {
    public static SimpleExoPlayer getPlayerInstance(Context context, Uri fileUri, String encryptionProtocol, byte[] secretKey, byte[] iv)
            throws InvalidAlgorithmParameterException, NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException {
        //Controls track changes
        TrackSelector trackSelector = new DefaultTrackSelector();

        //Controls buffering
        LoadControl loadControl = new DefaultLoadControl();

        //Extracts data from data source
        ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();

        //Factory of EncryptedFileDataSource
        DataSource.Factory encryptedFileDataSourceFactory = new EncryptedFileDataSourceFactory(encryptionProtocol, secretKey, iv, null);

        MediaSource mediaSource = new ExtractorMediaSource(fileUri, encryptedFileDataSourceFactory, extractorsFactory, null, null);

        //Creates a SimpleExoPlayer instance
        SimpleExoPlayer simpleExoPlayer = ExoPlayerFactory.newSimpleInstance(context, trackSelector, loadControl);

        //Attache media source to player
        simpleExoPlayer.prepare(mediaSource);

        return simpleExoPlayer;
    }
}

然后在 PlayerTest.java 类中，我尝试测试 PlayerFactory.getPlayerInstance() 调用的结果对象是否等于 SimpleExoPlayer类对象。

这是测试:

@RunWith(AndroidJUnit4.class)
public class PlayerTest {
    //Encryption algorithm
    static final String ENC_ALG = "AES";
    //Encryption block mode
    static final String ENC_PROTOCOL = ENC_ALG + "/CTR/NoPadding";
    //File to be played
    static final String ENC_FILE = "song_encrypted_ctr.mp3";
    //Secrect key used in encryption
    public static final String mKey = "0123456789012345";
    //Initialization vector used in encryption
    public static final String mIV = "abcdefrtyqowueyr";

    @Test
    public void testCorrectIqraalyPlayerObject() throws Throwable {
        Context context = InstrumentationRegistry.getContext();
        SimpleExoPlayer simpleExoPlayer = PlayerFactory.getPlayerInstance(context, Uri.parse("testuri"), ENC_PROTOCOL, mKey.getBytes(), mIV.getBytes());
        Assert.assertEquals(SimpleExoPlayer.class.getName(), simpleExoPlayer.getClass().getName());
    }

但我总是得到一个RuntimeException:

java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

在这一行:

SimpleExoPlayer simpleExoPlayer = PlayerFactory.getPlayerInstance(context, Uri.parse("testuri"), ENC_PROTOCOL, mKey.getBytes(), mIV.getBytes());

我注意到在 PlayerFactory 的 ExoPlayerFactory.newSimpleInstance() 方法中有一个新的 Handler 创建和传递，我不知道它是做什么用的。如果有人知道为什么会这样，我将不胜感激。谢谢。

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更新:我尝试使用 @UiThreadTest 而不是 @Test，但出现了这个错误:

java.lang.Exception: No runnable methods

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更新 2:我尝试同时使用 @UiThreadTest 和 @Test 我得到了:

Given caller package com.example.rafael.exoplayerpoc.test is not running in process ProcessRecord{c32179c 10198:com.example.rafael.exoplayerpoc/u0a58}

Answer 1

使用 UiThreadTestRule 在 UI 线程上运行测试。更多详情 here