调用 pause() 时 Android MediaPlayer IllegalStateExceptoion

Question

我想根据应用程序的状态播放两个不同的背景音乐循环。为此，我尝试了该代码:

private void backgroundMusicPlayer() {
    if (gameMode == 0) {
        if (backgroundloop2 != null) {
            backgroundloop2.pause();
            backgroundloop2.stop();
            backgroundloop2.release();
            backgroundloop2 = null;
        }
        backgroundloop1 = MediaPlayer.create(getContext(), R.raw.gameloop1);
        backgroundloop1.setLooping(true);
        backgroundloop1.start();
    }
    else {
        if (backgroundloop1 != null) {
            backgroundloop1.pause();
            backgroundloop1.stop();
            backgroundloop1.release();
            backgroundloop1 = null;
        }
        backgroundloop2 = MediaPlayer.create(getContext(), R.raw.gameloop2);
        backgroundloop2.setLooping(true);
        backgroundloop2.start();
    }
}

但我只是得到错误:

"MediaPlayer: start called in state 64" "MediaPlayer: pause called in state 8" "Failed to open libwvm.so: dlopen failed: library "libwvm.so" not found" "Media Player called in state 0, error (-38,0)"

我怎样才能正确地做到这一点？

Answer 1

为什么在 onPause() 中出现 IllegalStateException？

在 onPause 的 Android 文档中:

IllegalStateException
If the internal player engine has not been initialized.

在文档中，您可以看到最多的媒体播放器方法会出于某种原因抛出 IllegalStateException。

因此，对所有媒体播放器操作使用try catch。

Android 建议在使用媒体播放器对象时查找异常。

It is good programming practice to always look out for IllegalArgumentException and IOException that may be thrown from the overloaded setDataSource methods.