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我应该为 iOS 和 Android 编写一个应用程序，有时会在屏幕的一部分上显示自定义的视频播放器。我必须能够控制它（搜索、播放、暂停、设置速度、选择视频……）。我知道 Gluon 尚不支持此类媒体。

但是有可能在 XCode 和 Android Studio 中编写这样的东西并以某种方式将其嵌入到 Gluon 应用程序中吗？

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2 回答 2

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遵循 Gluon Charm Down库中的设计模式，这可能是VideoService.

它基于本教程，并适用于SurfaceViewJavaFX 使用的当前。它将创建一个TextureView放置在屏幕中心、当前视图顶部、占其宽度的 95% 的位置。

使用 IDE 的 Gluon 插件，创建一个单一视图项目。

  1. 将这两个类放在 Source Packages, package 下com.gluonhq.charm.down.plugins：

视频服务接口

package com.gluonhq.charm.down.plugins;

public interface VideoService {
    void play(String videoName);
    void stop();
    void pause();
    void resume();
}

VideoServiceFactory 类

package com.gluonhq.charm.down.plugins;

import com.gluonhq.charm.down.DefaultServiceFactory;

public class VideoServiceFactory extends DefaultServiceFactory<VideoService> {

    public VideoServiceFactory() {
        super(VideoService.class);
    }

}
  1. Android Package：将此类放在 Android/Java Packages 下，包com.gluonhq.charm.down.plugins.android：

AndroidVideoService 类

package com.gluonhq.charm.down.plugins.android;

import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.graphics.SurfaceTexture;
import android.media.MediaMetadataRetriever;
import android.media.MediaPlayer;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Surface;
import android.view.TextureView;
import android.view.WindowManager;
import android.widget.RelativeLayout;
import com.gluonhq.charm.down.plugins.VideoService;
import java.io.IOException;
import javafxports.android.FXActivity;

public class AndroidVideoService implements VideoService, TextureView.SurfaceTextureListener {
    private static final String TAG = AndroidVideoService.class.getName();
    private MediaPlayer mMediaPlayer;
    private String videoName;

    private final RelativeLayout relativeLayout;
    private final TextureView textureView;
    private final DisplayMetrics displayMetrics;

    public AndroidVideoService() {
        displayMetrics = new DisplayMetrics();
        WindowManager windowManager = (WindowManager) FXActivity.getInstance().getSystemService(Context.WINDOW_SERVICE);
        windowManager.getDefaultDisplay().getMetrics(displayMetrics);

        relativeLayout = new RelativeLayout(FXActivity.getInstance());

        textureView = new TextureView(FXActivity.getInstance());
        textureView.setSurfaceTextureListener(this);
        relativeLayout.addView(textureView);
    }

    @Override
    public void play(String videoName) {
        this.videoName = videoName;
        stop();
        FXActivity.getInstance().runOnUiThread(() -> {
            FXActivity.getViewGroup().addView(relativeLayout);
        });
    }

    @Override
    public void stop() {
        if (mMediaPlayer != null) {
            mMediaPlayer.stop();
            mMediaPlayer.release();
            mMediaPlayer = null;
        }
        if (relativeLayout != null) {
            FXActivity.getInstance().runOnUiThread(() -> {
                FXActivity.getViewGroup().removeView(relativeLayout);
            });
        }
    }

    @Override
    public void pause() {
        if (mMediaPlayer != null) {
            mMediaPlayer.pause();
        }
    }

    @Override
    public void resume() {
        if (mMediaPlayer != null) { 
            mMediaPlayer.start();
        }
    }

    @Override
    public void onSurfaceTextureAvailable(SurfaceTexture st, int i, int i1) {
        Surface surface = new Surface(st);
        try {
            AssetFileDescriptor afd = FXActivity.getInstance().getAssets().openFd(videoName);
            calculateVideoSize(afd);
            mMediaPlayer = new MediaPlayer();
            mMediaPlayer.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
            mMediaPlayer.setSurface(surface);
            mMediaPlayer.setLooping(true);
            mMediaPlayer.prepareAsync();
            mMediaPlayer.setOnPreparedListener(mediaPlayer -> mediaPlayer.start());

        } catch (IllegalArgumentException | SecurityException | IllegalStateException | IOException e) {
            Log.d(TAG, e.getMessage());
        }
    }

    @Override public void onSurfaceTextureSizeChanged(SurfaceTexture st, int i, int i1) { }
    @Override public boolean onSurfaceTextureDestroyed(SurfaceTexture st) { return true; }
    @Override public void onSurfaceTextureUpdated(SurfaceTexture st) { }

    private void calculateVideoSize(AssetFileDescriptor afd) {
        try {
            MediaMetadataRetriever metaRetriever = new MediaMetadataRetriever();
            metaRetriever.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
            String height = metaRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT);
            String width = metaRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH);
            double factor = Double.parseDouble(width) > 0 ? Double.parseDouble(height) / Double.parseDouble(width) : 1d;
            // 95% screen width
            RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams((int) (0.95 * displayMetrics.widthPixels), 
                    (int) (0.95 * displayMetrics.widthPixels * factor));
            lp.addRule(RelativeLayout.CENTER_IN_PARENT);
            textureView.setLayoutParams(lp);
        } catch (NumberFormatException e) {
            Log.d(TAG, e.getMessage());
        }
    }
}
  1. 样本

在 android/assets 文件夹中放置一个视频文件，例如big_buck_bunny.mp4，可以从这里下载。

基本视图

public class BasicView extends View {

    private boolean paused;

    public BasicView(String name) {
        super(name);
    }

    @Override
    protected void updateAppBar(AppBar appBar) {
        appBar.setNavIcon(MaterialDesignIcon.MENU.button());
        appBar.setTitleText("Video View");
        // big_buck_bunny.mp4 video in src/android/assets:
        Services.get(VideoService.class).ifPresent(video -> {
            appBar.getActionItems().add(MaterialDesignIcon.PLAY_ARROW.button(e -> video.play("big_buck_bunny.mp4")));
            appBar.getActionItems().add(MaterialDesignIcon.PAUSE.button(e -> {
                if (!paused) {
                    video.pause();
                    paused = true;
                } else {
                    video.resume();
                    paused = false;
                }
            }));
            appBar.getActionItems().add(MaterialDesignIcon.STOP.button(e -> video.stop()));
        });
    }

}

在您的 Android 设备上部署并测试：

请注意，TextureView 将位于顶部，直到您按下停止按钮将其移除。

于 2016-12-17T20:10:57.107 回答
0

在以下示例中使用了本机视频播放器（或在本例中为“预览”视频的方法）：

https://gist.github.com/bgmf/d87a2bac0a5623f359637a3da334f980

除了一些先决条件之外，代码如下所示：

package my.application;

import ch.cnlab.disentis.util.Constants;
import org.robovm.apple.foundation.*;
import org.robovm.apple.uikit.UIApplication;
import org.robovm.apple.uikit.UIDocumentInteractionController;
import org.robovm.apple.uikit.UIDocumentInteractionControllerDelegateAdapter;
import org.robovm.apple.uikit.UIViewController;

import java.io.File;
import java.util.logging.Logger;

public class NativeVideoServiceIOS extends PathHelperIOS implements NativeVideoService {
    private static final Logger LOG = Logger.getLogger(NativeVideoServiceIOS.class.getName());

    public NativeVideoServiceIOS() {
        LOG.warning("Initialized Native Video Service with path: " + this.pathBase);
    }

    @Override
    public void triggerPlatformApp(String filename) {
        String fullfile = pathBase.getAbsolutePath() + filename;
        NSURL url = new NSURL(NSURLScheme.File, "", fullfile);
        UIDocumentInteractionController popup = new UIDocumentInteractionController(url);
        popup.setDelegate(new UIDocumentInteractionControllerDelegateAdapter() {
            @Override
            public UIViewController getViewControllerForPreview(UIDocumentInteractionController controller) {
                return UIApplication.getSharedApplication()
                        .getWindows().first().getRootViewController();
            }
        });
        popup.presentPreview(true);
    }

}
于 2017-02-10T13:04:48.387 回答