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我是echo回聲的忠實粉絲，里面的各種3D音效真是美滴很美滴很。這個App的開發(fā)組是完美主義，被深深吸引無法自拔。尤其是彈幕的神評論更加搞笑。今天，我就仿著echo的彈幕純手打了一個效果出來。

是時候來一發(fā)炸裂的開場了：

寫這個功能之前，我低下頭深深沉思，我要做什么功能呢，要怎么做到呢？寫程序要一步一步來，步子大了會扯著蛋，于是我在紙上列出：

1、創(chuàng)建一個Relativelayout,在里面添加一個moveView(每一個彈幕view)。

2、寫下這個moveView和該布局。

3、給moveView添加translation動畫從右往左跑出，動畫開始添加，動畫結(jié)束移除該view。

4、用定時器不停創(chuàng)建多個moveView從右往左動畫。

5、在根據(jù)Relativelayout的高度范圍，創(chuàng)建隨機高度，設(shè)置給moveView的上邊界距離。

6、創(chuàng)建數(shù)據(jù)源，包括頭像id，名字，彈幕文字內(nèi)容

7、設(shè)置隨機出現(xiàn)間隔時間；設(shè)置背景圖（這里我是截的背景圖）

我用雙手成就我的設(shè)想：

1、創(chuàng)建MoveView布局

<LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="horizontal"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:gravity="center_vertical">
    <ImageView        android:id="@+id/avator"        android:layout_width="30dp"        android:layout_height="30dp"        android:background="@mipmap/internet_star"/>
    <LinearLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="10dp"        android:background="@drawable/shape_text">
        <TextView            android:id="@+id/tv_name"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="Jack ma"            android:textColor="#2ecc71"/>
        <TextView            android:id="@+id/tv_content"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginLeft="8dp"            android:text="哈哈哈"            android:singleLine="true"            android:background="@drawable/shape_text"            android:textColor="#000" />    </LinearLayout>
</LinearLayout>

2、創(chuàng)建moveview，傳入Relativelayout高度隨機設(shè)置params.topMargin屬性值，即隨機垂直高度出現(xiàn)。

public class MoveView extends LinearLayout{    private View rootView;    private ImageView ivAvator;    private TextView tvName;    private TextView tvContent;
    public MoveView(Context context, DanmuBean danmuBean) {        super(context);
        rootView = inflate(context,R.layout.item,null);        addView(rootView);        init(danmuBean);    }
    private void init(DanmuBean danmuBean) {        ivAvator = rootView.findViewById(R.id.avator);        tvName = rootView.findViewById(R.id.tv_name);        tvContent = rootView.findViewById(R.id.tv_content);
        ivAvator.setImageResource(danmuBean.getAvatorId());        tvName.setText(danmuBean.getUserName());        tvContent.setText(danmuBean.getContent());    }
    /**     * 設(shè)置隨機出現(xiàn)垂直位置     */    public void randomVerticalPos(int heightPixels){        int randonTop = (int) (Math.random()*heightPixels);
        RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) getLayoutParams();        params.topMargin = randonTop;        setLayoutParams(params);    }
}

3、隨機設(shè)置Translationg動畫的duration，即實現(xiàn)隨機移動速度；

    private void startTranslateAnim(final View view){        int randomDuration = (int) (Math.random()*2000 + 7000);        TranslateAnimation anim = new TranslateAnimation(widthPixels,-widthPixels,0,0);        anim.setDuration(randomDuration);        anim.setAnimationListener(new Animation.AnimationListener() {            @Override            public void onAnimationStart(Animation animation) {
            }
            @Override            public void onAnimationEnd(Animation animation) {                removeView(view);            }
            @Override            public void onAnimationRepeat(Animation animation) {
            }        });        view.startAnimation(anim);    }

4、handler隨機間隔創(chuàng)建moveview

    private Handler handler = new Handler(){        @Override        public void handleMessage(Message msg) {            addTextView();
            //彈幕出現(xiàn)間隔時間400-700ms            int randomDelay = (int) (Math.random()*300+400);            handler.sendEmptyMessageDelayed(0,randomDelay);        }    };
    private void addTextView(){        if(curPos == datas.size()){  //循環(huán)播放            curPos = 0;        }        MoveView moveView = new MoveView(getContext(),datas.get(curPos++));        addView(moveView);        moveView.randomVerticalPos(heightPixels);        startTranslateAnim(moveView);    }

5、模擬網(wǎng)絡(luò)請求彈幕數(shù)據(jù)列表，這里包括，頭像、用戶名、彈幕內(nèi)容

    private List loadData(){        ArrayList<DanmuBean> datas = new ArrayList<>();        datas.add(new DanmuBean(0,R.mipmap.internet_star,"小強","女神我愛你！"));        datas.add(new DanmuBean(0,R.mipmap.make_music_voice_changer_funny,"Jack ma","媽媽問我為什么跪著聽歌"));        datas.add(new DanmuBean(0,R.mipmap.make_music_voice_changer_lori,"習大大","歌詞特別美"));        datas.add(new DanmuBean(0,R.mipmap.make_music_voice_changer_robot,"寶強","全世界都安靜了"));        datas.add(new DanmuBean(0,R.mipmap.make_music_voice_changer_uncle,"寶寶","聽到放不下耳機，聽到耳朵痛都不放下，哈哈哈"));        datas.add(new DanmuBean(0,R.mipmap.internet_star,"我是大神","中國好聲音，I want you"));        datas.add(new DanmuBean(0,R.mipmap.internet_star,"茜茜","一天腦子里都在唱這首歌"));        datas.add(new DanmuBean(0,R.mipmap.make_music_voice_changer_funny,"Bangbangbang","有故事，好聽"));        datas.add(new DanmuBean(0,R.mipmap.make_music_voice_changer_uncle,"stalse","我就是為了你開的會員"));        datas.add(new DanmuBean(0,R.mipmap.internet_star,"hehe","太好聽了.."));        datas.add(new DanmuBean(0,R.mipmap.make_music_voice_changer_robot,"小強","女神我愛你！"));        datas.add(new DanmuBean(0,R.mipmap.make_music_voice_changer_uncle,"Jack ma","媽媽問我為什么跪著聽歌"));        datas.add(new DanmuBean(0,R.mipmap.internet_star,"習大大","歌詞特別美"));        datas.add(new DanmuBean(0,R.mipmap.make_music_voice_changer_funny,"寶強","全世界都安靜了"));        datas.add(new DanmuBean(0,R.mipmap.internet_star,"寶寶","聽到放不下耳機，聽到耳朵痛都不放下，哈哈哈"));        datas.add(new DanmuBean(0,R.mipmap.internet_star,"我是大神","中國好聲音，I want you"));        datas.add(new DanmuBean(0,R.mipmap.make_music_voice_changer_robot,"茜茜","一天腦子里都在唱這首歌"));        datas.add(new DanmuBean(0,R.mipmap.make_music_voice_changer_uncle,"Bangbangbang","有故事，好聽"));        datas.add(new DanmuBean(0,R.mipmap.internet_star,"stalse","我就是為了你開的會員"));        datas.add(new DanmuBean(0,R.mipmap.make_music_voice_changer_funny,"hehe","太好聽了.."));        datas.add(new DanmuBean(0,R.mipmap.internet_star,"小強","女神我愛你！"));        datas.add(new DanmuBean(0,R.mipmap.make_music_voice_changer_robot,"Jack ma","媽媽問我為什么跪著聽歌"));        datas.add(new DanmuBean(0,R.mipmap.make_music_voice_changer_uncle,"習大大","歌詞特別美"));        datas.add(new DanmuBean(0,R.mipmap.internet_star,"寶強","全世界都安靜了"));        datas.add(new DanmuBean(0,R.mipmap.make_music_voice_changer_funny,"寶寶","聽到放不下耳機，聽到耳朵痛都不放下，哈哈哈"));        datas.add(new DanmuBean(0,R.mipmap.internet_star,"我是大神","中國好聲音，I want you"));        datas.add(new DanmuBean(0,R.mipmap.make_music_voice_changer_uncle,"茜茜","一天腦子里都在唱這首歌"));        datas.add(new DanmuBean(0,R.mipmap.internet_star,"Bangbangbang","有故事，好聽"));        datas.add(new DanmuBean(0,R.mipmap.make_music_voice_changer_funny,"stalse","我就是為了你開的會員"));        datas.add(new DanmuBean(0,R.mipmap.internet_star,"hehe","太好聽了.."));
        return datas;    }

源碼地址：

https://github.com/18380438200/Danmu

到這里就結(jié)束啦。

Android仿echo評論彈幕效果

我用雙手成就我的設(shè)想：