Android实现炫酷的网络直播弹幕功能

2019-10-23 20:06:50

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现在网络直播越来越火，网络主播也逐渐成为一种新兴职业，对于网络直播，弹幕功能是必须要有的，如下图：

Android,网络直播,弹幕

首先来分析一下，这个弹幕功能是怎么实现的，首先在最下面肯定是一个游戏界面View，然后游戏界面上有弹幕View，弹幕的View必须要做成完全透明的，这样即使覆盖在游戏界面的上方也不会影响到游戏的正常观看，只有当有人发弹幕消息时，再将消息绘制到弹幕的View上面就可以了，下方肯定还有有操作界面View，可以让用户来发弹幕和送礼物的功能，原理示意图如下所示：

Android,网络直播,弹幕

参照原理图，下面一步一步来实现这个功能。

实现视频的播放

activity_main.xml

<RelativeLayout   xmlns:android="http://schemas.android.com/apk/res/android"   android:id="@+id/activity_main"   android:layout_width="match_parent"   android:layout_height="match_parent"   android:background="#000">    <VideoView     android:id="@+id/video_view"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_centerInParent="true"/> </RelativeLayout>

MainActivity.java

package com.jackie.bombscreen;  import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.VideoView;  public class MainActivity extends AppCompatActivity {   @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     VideoView videoView = (VideoView) findViewById(R.id.video_view);     videoView.setVideoPath(Environment.getExternalStorageDirectory() + "/xiaoxingyun.mp4");     videoView.start();   }      @Override   public void onWindowFocusChanged(boolean hasFocus) {     super.onWindowFocusChanged(hasFocus);     if (hasFocus && Build.VERSION.SDK_INT >= 19) {       View decorView = getWindow().getDecorView();       decorView.setSystemUiVisibility(           View.SYSTEM_UI_FLAG_LAYOUT_STABLE               | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION               | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN               | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION               | View.SYSTEM_UI_FLAG_FULLSCREEN               | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);     }   } }

最后别忘了设置AndroidMainfest.xml

Android,网络直播,弹幕

效果如下：

Android,网络直播,弹幕

实现弹幕的效果

接下来我们开始实现弹幕效果。弹幕其实也就是一个自定义的View，它的上面可以显示类似于跑马灯的文字效果。观众们发表的评论都会在弹幕上显示出来，但又会很快地移出屏幕，既可以起到互动的作用，同时又不会影响视频的正常观看。

我们可以自己来编写这样的一个自定义View，当然也可以直接使用网上现成的开源项目。那么为了能够简单快速地实现弹幕效果，这里我就准备直接使用由哔哩哔哩开源的弹幕效果库DanmakuFlameMaster。

DanmakuFlameMaster库的项目主页地址是：https://github.com/Bilibili/DanmakuFlameMaster

添加build.gradle依赖

compile 'com.github.ctiao:DanmakuFlameMaster:0.5.3'

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout   xmlns:android="http://schemas.android.com/apk/res/android"   android:id="@+id/activity_main"   android:layout_width="match_parent"   android:layout_height="match_parent"   android:background="#000">    <VideoView     android:id="@+id/video_view"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_centerInParent="true"/>    <master.flame.danmaku.ui.widget.DanmakuView     android:id="@+id/danmaku_view"     android:layout_width="match_parent"     android:layout_height="match_parent" /> </RelativeLayout>

修改MainActivity.java

package com.jackie.bombscreen;  import android.graphics.Color; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.VideoView;  import java.util.Random;  import master.flame.danmaku.controller.DrawHandler; import master.flame.danmaku.danmaku.model.BaseDanmaku; import master.flame.danmaku.danmaku.model.DanmakuTimer; import master.flame.danmaku.danmaku.model.IDanmakus; import master.flame.danmaku.danmaku.model.android.DanmakuContext; import master.flame.danmaku.danmaku.model.android.Danmakus; import master.flame.danmaku.danmaku.parser.BaseDanmakuParser; import master.flame.danmaku.ui.widget.DanmakuView;  public class MainActivity extends AppCompatActivity {   private boolean mIsShowDanmaku;   private DanmakuView mDanmakuView;   private DanmakuContext mDanmakuContext;    private BaseDanmakuParser parser = new BaseDanmakuParser() {     @Override     protected IDanmakus parse() {       return new Danmakus();     }   };    @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     VideoView videoView = (VideoView) findViewById(R.id.video_view);     videoView.setVideoPath(Environment.getExternalStorageDirectory() + "/xiaoxingyun.mp4");     videoView.start();      mDanmakuView = (DanmakuView) findViewById(R.id.danmaku_view);     mDanmakuView.enableDanmakuDrawingCache(true);     mDanmakuView.setCallback(new DrawHandler.Callback() {       @Override       public void prepared() {         mIsShowDanmaku = true;         mDanmakuView.start();         generateSomeDanmaku();       }        @Override       public void updateTimer(DanmakuTimer timer) {        }        @Override       public void danmakuShown(BaseDanmaku danmaku) {        }        @Override       public void drawingFinished() {        }     });      mDanmakuContext = DanmakuContext.create();     mDanmakuView.prepare(parser, mDanmakuContext);   }    /**    * 向弹幕View中添加一条弹幕    * @param content    弹幕的具体内容    * @param withBorder  弹幕是否有边框    */   private void addDanmaku(String content, boolean withBorder) {     BaseDanmaku danmaku = mDanmakuContext.mDanmakuFactory.createDanmaku(BaseDanmaku.TYPE_SCROLL_RL);     danmaku.text = content;     danmaku.padding = 5;     danmaku.textSize = sp2px(20);     danmaku.textColor = Color.WHITE;     danmaku.setTime(mDanmakuView.getCurrentTime());     if (withBorder) {       danmaku.borderColor = Color.GREEN;     }     mDanmakuView.addDanmaku(danmaku);   }    /**    * 随机生成一些弹幕内容以供测试    */   private void generateSomeDanmaku() {     new Thread(new Runnable() {       @Override       public void run() {         while(mIsShowDanmaku) {           int time = new Random().nextInt(300);           String content = "" + time + time;           addDanmaku(content, false);           try {             Thread.sleep(time);           } catch (InterruptedException e) {             e.printStackTrace();           }         }       }     }).start();   }    /**    * sp转px的方法。    */   public int sp2px(float spValue) {     final float fontScale = getResources().getDisplayMetrics().scaledDensity;     return (int) (spValue * fontScale + 0.5f);   }    @Override   protected void onPause() {     super.onPause();     if (mDanmakuView != null && mDanmakuView.isPrepared()) {       mDanmakuView.pause();     }   }    @Override   protected void onResume() {     super.onResume();     if (mDanmakuView != null && mDanmakuView.isPrepared() && mDanmakuView.isPaused()) {       mDanmakuView.resume();     }   }    @Override   protected void onDestroy() {     super.onDestroy();     mIsShowDanmaku = false;     if (mDanmakuView != null) {       mDanmakuView.release();       mDanmakuView = null;     }   }      @Override   public void onWindowFocusChanged(boolean hasFocus) {     super.onWindowFocusChanged(hasFocus);     if (hasFocus && Build.VERSION.SDK_INT >= 19) {       View decorView = getWindow().getDecorView();       decorView.setSystemUiVisibility(           View.SYSTEM_UI_FLAG_LAYOUT_STABLE               | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION               | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN               | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION               | View.SYSTEM_UI_FLAG_FULLSCREEN               | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);     }   } }

效果图如下：

Android,网络直播,弹幕

加入操作界面

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout   xmlns:android="http://schemas.android.com/apk/res/android"   android:id="@+id/activity_main"   android:layout_width="match_parent"   android:layout_height="match_parent"   android:background="#000">    <VideoView     android:id="@+id/video_view"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_centerInParent="true"/>    <master.flame.danmaku.ui.widget.DanmakuView     android:id="@+id/danmaku_view"     android:layout_width="match_parent"     android:layout_height="match_parent" />    <LinearLayout     android:id="@+id/operation_layout"     android:layout_width="match_parent"     android:layout_height="50dp"     android:layout_alignParentBottom="true"     android:background="#fff"     android:visibility="gone">      <EditText       android:id="@+id/edit_text"       android:layout_width="0dp"       android:layout_height="match_parent"       android:layout_weight="1" />      <Button       android:id="@+id/send"       android:layout_width="wrap_content"       android:layout_height="match_parent"       android:text="Send" />   </LinearLayout> </RelativeLayout>

package com.jackie.bombscreen;  import android.graphics.Color; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.support.v7.app.AppCompatActivity; import android.text.TextUtils; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.LinearLayout; import android.widget.VideoView;  import java.util.Random;  import master.flame.danmaku.controller.DrawHandler; import master.flame.danmaku.danmaku.model.BaseDanmaku; import master.flame.danmaku.danmaku.model.DanmakuTimer; import master.flame.danmaku.danmaku.model.IDanmakus; import master.flame.danmaku.danmaku.model.android.DanmakuContext; import master.flame.danmaku.danmaku.model.android.Danmakus; import master.flame.danmaku.danmaku.parser.BaseDanmakuParser; import master.flame.danmaku.ui.widget.DanmakuView;  public class MainActivity extends AppCompatActivity {   private boolean mIsShowDanmaku;   private DanmakuView mDanmakuView;   private DanmakuContext mDanmakuContext;    private BaseDanmakuParser parser = new BaseDanmakuParser() {     @Override     protected IDanmakus parse() {       return new Danmakus();     }   };    @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     VideoView videoView = (VideoView) findViewById(R.id.video_view);     videoView.setVideoPath(Environment.getExternalStorageDirectory() + "/xiaoxingyun.mp4");     videoView.start();      mDanmakuView = (DanmakuView) findViewById(R.id.danmaku_view);     mDanmakuView.enableDanmakuDrawingCache(true);     mDanmakuView.setCallback(new DrawHandler.Callback() {       @Override       public void prepared() {         mIsShowDanmaku = true;         mDanmakuView.start();         generateSomeDanmaku();       }        @Override       public void updateTimer(DanmakuTimer timer) {        }        @Override       public void danmakuShown(BaseDanmaku danmaku) {        }        @Override       public void drawingFinished() {        }     });      mDanmakuContext = DanmakuContext.create();     mDanmakuView.prepare(parser, mDanmakuContext);      final LinearLayout operationLayout = (LinearLayout) findViewById(R.id.operation_layout);     final Button send = (Button) findViewById(R.id.send);     final EditText editText = (EditText) findViewById(R.id.edit_text);     mDanmakuView.setOnClickListener(new View.OnClickListener() {       @Override       public void onClick(View view) {         if (operationLayout.getVisibility() == View.GONE) {           operationLayout.setVisibility(View.VISIBLE);         } else {           operationLayout.setVisibility(View.GONE);         }       }     });          send.setOnClickListener(new View.OnClickListener() {       @Override       public void onClick(View view) {         String content = editText.getText().toString();         if (!TextUtils.isEmpty(content)) {           addDanmaku(content, true);           editText.setText("");         }       }     });      getWindow().getDecorView().setOnSystemUiVisibilityChangeListener (new View.OnSystemUiVisibilityChangeListener() {       @Override       public void onSystemUiVisibilityChange(int visibility) {         if (visibility == View.SYSTEM_UI_FLAG_VISIBLE) {           onWindowFocusChanged(true);         }       }     });   }    /**    * 向弹幕View中添加一条弹幕    * @param content    弹幕的具体内容    * @param withBorder  弹幕是否有边框    */   private void addDanmaku(String content, boolean withBorder) {     BaseDanmaku danmaku = mDanmakuContext.mDanmakuFactory.createDanmaku(BaseDanmaku.TYPE_SCROLL_RL);     danmaku.text = content;     danmaku.padding = 5;     danmaku.textSize = sp2px(20);     danmaku.textColor = Color.WHITE;     danmaku.setTime(mDanmakuView.getCurrentTime());     if (withBorder) {       danmaku.borderColor = Color.GREEN;     }     mDanmakuView.addDanmaku(danmaku);   }    /**    * 随机生成一些弹幕内容以供测试    */   private void generateSomeDanmaku() {     new Thread(new Runnable() {       @Override       public void run() {         while(mIsShowDanmaku) {           int time = new Random().nextInt(300);           String content = "" + time + time;           addDanmaku(content, false);           try {             Thread.sleep(time);           } catch (InterruptedException e) {             e.printStackTrace();           }         }       }     }).start();   }    /**    * sp转px的方法。    */   public int sp2px(float spValue) {     final float fontScale = getResources().getDisplayMetrics().scaledDensity;     return (int) (spValue * fontScale + 0.5f);   }    @Override   protected void onPause() {     super.onPause();     if (mDanmakuView != null && mDanmakuView.isPrepared()) {       mDanmakuView.pause();     }   }    @Override   protected void onResume() {     super.onResume();     if (mDanmakuView != null && mDanmakuView.isPrepared() && mDanmakuView.isPaused()) {       mDanmakuView.resume();     }   }    @Override   protected void onDestroy() {     super.onDestroy();     mIsShowDanmaku = false;     if (mDanmakuView != null) {       mDanmakuView.release();       mDanmakuView = null;     }   }     @Override   public void onWindowFocusChanged(boolean hasFocus) {     super.onWindowFocusChanged(hasFocus);     if (hasFocus && Build.VERSION.SDK_INT >= 19) {       View decorView = getWindow().getDecorView();       decorView.setSystemUiVisibility(           View.SYSTEM_UI_FLAG_LAYOUT_STABLE               | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION               | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN               | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION               | View.SYSTEM_UI_FLAG_FULLSCREEN               | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);     }   } }

效果图如下：

Android,网络直播,弹幕