Android的简易弹幕

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一段时间没写Android了,有时间必须来敲一敲Android的代码才行,不然很快就忘光了.

发现AS的快捷键很多都忘记了. 敲了一份弹幕的Demo

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布局文件:activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

主类: MainActivity

/** * @author ClamLaw * @time 2016/11/26   * @desc MainActivity */public class MainActivity extends AppCompatActivity {    private EditText mText;    private List mList = new ArrayList<>();    private DanMuView mDanMuView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();//初始化        initData();    }    private void initData() {        String[] array = getResources().getStringArray(R.array.danmuList);//先获取部分数据        for (int i = 0; i < array.length; i++) {            mList.add(array[i]);        }        mDanMuView.setData(mList);//向弹幕框添加数据        mDanMuView.startDanmu();//开始弹幕    }    //初始化    private void initView() {        mText = (EditText) findViewById(R.id.text);        mDanMuView = (DanMuView) findViewById(R.id.danmu);        findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {//发送按钮            @Override            public void onClick(View v) {                //发送评论                String str = mText.getText().toString();                mDanMuView.insertDanmu(str);            }        });    }}

自定义弹幕显示框控件: DanMuView

/** * @author ClamLaw * @time 2016/11/26  19:01 * @desc 自定义弹幕的view */public class DanMuView extends RelativeLayout {    private Context mContext;    private View view;    private RelativeLayout mContainerVG;    private List mList;    //父组件的高度    private int validHeightSpace;    private Set existMarginValues = new HashSet<>();    private int lastMarginValue;    ExecutorService executorService = Executors.newFixedThreadPool(1);//线程池    Handler mHandler = new Handler(){        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            switch (msg.what){                case 1:                    int index = msg.arg1;                    String data = mList.get(index);                    showDanmu(data);                    break;            }        }    };    public DanMuView(Context context) {        super(context);    }    public DanMuView(Context context, AttributeSet attrs) {        super(context, attrs);        this.mContext = context;        view = LayoutInflater.from(context).inflate(R.layout.danmu_view, null, false);        mContainerVG = (RelativeLayout) view.findViewById(R.id.danmu);        mContainerVG.setBackgroundDrawable(null);        addView(view);    }    /**     * 添加数据到弹幕中     *     * @param list     */    public void setData(List list) {        this.mList = list;    }    /**     * 用户发送评论弹幕     *     * @param data     */    public void insertDanmu(String data) {        showDanmu(data);//显示弹幕        mList.add(data);//将弹幕信息添加到集合的第一位        startDanmu();//开始弹幕    }    /**     * 开始弹幕     */    public void startDanmu() {       existMarginValues.clear();        executorService.execute(new Runnable() {            @Override            public void run() {                for (int i =0 ;i= (count + 1) * 2) {                    int end = count * 2;                    String result = new String(b, 0, end, encoding);                    if (str.indexOf(result) == -1) {                        return new String(b, 0, end - 1, encoding) + "...";                    }                    return result + "...";                }            } catch (UnsupportedEncodingException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        }        return str;    }    //动画    public class AnimationHelper{        public AnimationHelper() {        }        //fromX 开始的位置 ,toX结束的位置        public Animation createTranslateAnim(Context context, int fromX, int toX){            TranslateAnimation translateAnimation = new TranslateAnimation(fromX, toX, 0, 0);            int width = getScreenWidth((Activity)context);//获取屏幕的宽度            //自动计算时间            long duration = (long) (Math.abs(toX - fromX) * 1.0f / width * 6000);            translateAnimation.setDuration(duration);//动画时间           // translateAnimation.setInterpolator(new DecelerateAccelerateInterpolator());//动画速率            translateAnimation.setFillAfter(true);//终止时停留最后一帧            return translateAnimation;        }    }    public class DecelerateAccelerateInterpolator implements Interpolator {        @Override        public float getInterpolation(float input) {            return (float) (Math.tan((input * 2 - 1) / 4 * Math.PI)) / 2.0f + 0.5f;        }    }}

弹幕容器布局:danmu_view.xml

<?xml version="1.0" encoding="utf-8"?>

弹幕子控件布局:item_danmu.xml

<?xml version="1.0" encoding="utf-8"?>

本Demo的源码下载链接 DanMuDemo.

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结束!

如有错误或不足之处,请大家指出,谢谢!

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