使用VideoView做个实用的视频播放器

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.so.mymedia.ui.activity.MainActivity"
    tools:showIn="@layout/activity_main">

    <RelativeLayout
        android:id="@+id/rl_vv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@android:color/black"
        android:minHeight="200dp">

        <VideoView
            android:id="@+id/vv_video"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true" />
    </RelativeLayout>
</RelativeLayout>

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    if (mVvVideo == null) {
        return;
    }
    if (this.getResources().getConfiguration().orientation
            == Configuration.ORIENTATION_LANDSCAPE) {
        // 横屏
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        getWindow().getDecorView().invalidate();
        float height = new ScreenUtil(this).getAppWidth();
        float width = new ScreenUtil(this).getAppHeight();
        mRlVv.getLayoutParams().height = (int) width;
        mRlVv.getLayoutParams().width = (int) height;
    } else {
        // 竖屏
        final WindowManager.LayoutParams attrs = getWindow().getAttributes();
        attrs.flags &= (~WindowManager.LayoutParams.FLAG_FULLSCREEN);
        getWindow().setAttributes(attrs);
        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
        float width = new ScreenUtil(this).getAppWidth();
        float height = DisplayUtil.dp2px(this, 200.f);
        mRlVv.getLayoutParams().height = (int) height;
        mRlVv.getLayoutParams().width = (int) width;
    }
}

@Override
public boolean onTouch(View v, MotionEvent event) {
    return mGestureDetector.onTouchEvent(event);
}

@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
    float v = e2.getY() - e1.getY();
    if (Math.abs(v) > 10) {
        setVoiceVolume(v);
    }
    return true;
}

private void setVoiceVolume(float value) {
    int currentVolume = mAM.getStreamVolume(AudioManager.STREAM_MUSIC);
    int maxVolume = mAM.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
    int flag = value > 0 ? -1 : 1;
    currentVolume += flag * 0.15 * maxVolume;
    mAM.setStreamVolume(AudioManager.STREAM_MUSIC, currentVolume, 0);
}