OpenDanmaku实现弹幕效果

一、OpenDanmaku简介

1.OpenDanmaku介绍

OpenDanmaku是Android中第三方的弹幕控件，在播放视频和直播软件中过程中弹出用户的评论，并且以滚动的方式显示。

2.下载地址

https://github.com/linsea/OpenDanmaku

3.项目依赖

Gradle   dependencies {                compile 'com.linsea:opendanmaku:[email protected]'         }//或者引用本地libcompile project(':opendanmaku')

二、OpenDanmaku使用步骤

1.布局文件

2.弹幕逻辑代码

import com.opendanmaku.DanmakuItem;import com.opendanmaku.DanmakuView;import com.opendanmaku.IDanmakuItem;import java.util.ArrayList;import java.util.Collections;import java.util.List;public class OpendanmakuMainActivity extends AppCompatActivity implements View.OnClickListener{    private DanmakuView mDanmakuView;    private Button switcherBtn;    private Button sendBtn;    private EditText textEditText;    private TextView tv_title;    private VideoView videoView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_opendanmaku_main);        tv_title = (TextView) findViewById(R.id.tv_title);        tv_title.setText("Opendanmaku弹幕");        //实例化控件        mDanmakuView = (DanmakuView) findViewById(R.id.danmakuView);        switcherBtn = (Button) findViewById(R.id.switcher);        sendBtn = (Button) findViewById(R.id.send);        textEditText = (EditText) findViewById(R.id.text);        videoView = (VideoView) findViewById(R.id.videoView);        setVideoView();        //添加弹幕集合数据        List list = initItems();        //把数据进行随机排列        Collections.shuffle(list);        //添加到弹幕控件上        mDanmakuView.addItem(list, true);        switcherBtn.setOnClickListener(this);        sendBtn.setOnClickListener(this);    }    private void setVideoView() {        videoView.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {            @Override            public void onCompletion(MediaPlayer mp) {                videoView.start();            }        });        videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {            @Override            public void onPrepared(MediaPlayer mp) {                videoView.start();            }        });//        videoView.setVideoPath("http://10.0.2.2:8080/mp4/161122105613271790_480.mp4");        videoView.setVideoPath("http://10.0.2.2:8080/oppo.mp4");        videoView.setOnErrorListener(new MediaPlayer.OnErrorListener() {            @Override            public boolean onError(MediaPlayer mp, int what, int extra) {                Toast.makeText(OpendanmakuMainActivity.this, "您的手机不支持播放该视频", Toast.LENGTH_SHORT).show();                return true;            }        });        videoView.setMediaController(new MediaController(this));    }    private List initItems() {        List list = new ArrayList<>();        for (int i = 0; i < 100; i++) {            IDanmakuItem item = new DanmakuItem(this, i + " : plain text danmuku", mDanmakuView.getWidth());            list.add(item);        }        String msg = " : text with image   ";        for (int i = 0; i < 100; i++) {            ImageSpan imageSpan = new ImageSpan(this, R.drawable.em);            SpannableString spannableString = new SpannableString(i + msg);            spannableString.setSpan(imageSpan, spannableString.length() - 2, spannableString.length() - 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);            IDanmakuItem item = new DanmakuItem(this, spannableString, mDanmakuView.getWidth(), 0, 0, 0, 1.5f);            list.add(item);        }        return list;    }    @Override    protected void onResume() {        super.onResume();        mDanmakuView.show();    }    @Override    protected void onPause() {        super.onPause();        //隐藏        mDanmakuView.hide();    }    @Override    protected void onDestroy() {        super.onDestroy();        //清除        mDanmakuView.clear();    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.switcher:                if (mDanmakuView.isPaused()) {                    switcherBtn.setText(R.string.hide);                    mDanmakuView.show();                } else {                    switcherBtn.setText(R.string.show);                    mDanmakuView.hide();                }                break;            case R.id.send:                String input = textEditText.getText().toString();                if (TextUtils.isEmpty(input)) {                    Toast.makeText(OpendanmakuMainActivity.this, R.string.empty_prompt, Toast.LENGTH_SHORT).show();                } else {                    IDanmakuItem item = new DanmakuItem(this, new SpannableString(input), mDanmakuView.getWidth(),0,R.color.my_item_color,0,1);//                    IDanmakuItem item = new DanmakuItem(this, input, mDanmakuView.getWidth());//                    item.setTextColor(getResources().getColor(R.color.my_item_color));//                    item.setTextSize(14);//                    item.setTextColor(textColor);                    mDanmakuView.addItemToHead(item);                }                textEditText.setText("");                break;        }    }}

3.在视频上用OpenDanmaku显示弹幕

设置视频路径：http://api.m.mtime.cn/PageSubArea/TrailerList.api

4.解决弹幕把视频遮挡的问题

    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        if (status == STATUS_RUNNING) {            try {//                canvas.drawColor(Color.TRANSPARENT);                canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);                //先绘制正在播放的弹幕                for (int i = 0; i < mChannelMap.size(); i++) {                    ArrayList list = mChannelMap.get(i);                    for (Iterator it = list.iterator(); it.hasNext(); ) {                        IDanmakuItem item = it.next();                        if (item.isOut()) {                            it.remove();                        } else {                            item.doDraw(canvas);                        }                    }                }                //检查是否需要加载播放下一个弹幕                if (System.currentTimeMillis() - previousTime > mPickItemInterval) {                    previousTime = System.currentTimeMillis();//                    Log.d(TAG, "start pick new item..");                    IDanmakuItem di = mWaitingItems.pollFirst();                    if (di != null) {                        int indexY = findVacant(di);                        if (indexY >= 0) {//                            Log.d(TAG, "find vacant channel");                            di.setStartPosition(canvas.getWidth() - 2, mChannelY[indexY]);//                            Log.d(TAG, "draw new, text:" + di.getText());                            //Log.d(TAG, String.format("doDraw, position,x=%s,y=%s", c.getWidth() - 1, mChannelY[indexY]));                            di.doDraw(canvas);                            mChannelMap.get(indexY).add(di);//不要忘记加入正运行的维护的列表中                        } else {//                                Log.d(TAG, "Not find vacant channel, add it back");                            addItemToHead(di);//找不到可以播放的弹道,则把它放回列表中                        }                    } else {                        //no item 弹幕播放完毕,                    }                }                if (mShowDebug) {                    int fps = (int) fps();                    canvas.drawText("FPS:" + fps, 5f, 20f, fpsPaint);                    for (float yp : lines) {                        canvas.drawLine(0f, yp, getWidth(), yp, fpsPaint);                    }                }            } catch (Exception e) {                e.printStackTrace();            }            invalidate();        } else {//暂停或停止,隐藏弹幕内容            canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);        }    }

看到此，是不是接的OpenDanmaku的简单使用是不是很简单，谢谢浏览！

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