Android跑马灯两种方式

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第一中方式：TextView实现

 <TextView        android:id="@+id/text_sign_message"        android:layout_width="match_parent"        android:layout_height="31dp"        android:background="@color/sign_notice"        android:ellipsize="marquee"        android:focusable="true"        android:focusableInTouchMode="true"        android:gravity="center_vertical"        android:marqueeRepeatLimit="marquee_forever"        android:singleLine="true"        android:text="签到奖励规则变更通知：连续第1、2、3、4、5、6、7....."        android:textColor="@color/sign_notice_text"        android:textSize="@dimen/normal_13"/>

android:focusable="true"android:focusableInTouchMode="true"获取焦点，没有焦点跑马灯效果不能实现

<pre name="code" class="html">android:marqueeRepeatLimit="marquee_forever"无限循环

第二种实现效果，自定义控件

public class MarqueeTextView extends TextView{    /**     * 是否停止滚动     */    private boolean mStopMarquee;    private String mText;//文本内容    private float mTextWidth;//文本宽度    private int speed = 1;//滚动速度    private float mCoordinateX = 0;//当前滚动位置    public MarqueeTextView(Context context) {        super(context);    }    public MarqueeTextView(Context context, AttributeSet attrs) {        super(context, attrs);    }    public MarqueeTextView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    public int getSpeed() {        return speed;    }    /**     * 设置速度     *     * @return     */    public void setSpeed(int speed) {        this.speed = speed;    }    public void setText(String text) {        this.mText = text;        mTextWidth = getPaint().measureText(mText);        if (mHandler.hasMessages(0))            mHandler.removeMessages(0);        mHandler.sendEmptyMessageDelayed(0, 0);    }    @Override    protected void onAttachedToWindow() {        mStopMarquee = false;        if (!isEmpty(mText))            mHandler.sendEmptyMessageDelayed(0, 0);        super.onAttachedToWindow();    }    @Override    protected void onDetachedFromWindow() {        mStopMarquee = true;        if (mHandler.hasMessages(0))            mHandler.removeMessages(0);        super.onDetachedFromWindow();    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        if (!isEmpty(mText))            canvas.drawText(mText, mCoordinateX, dp2px(20), getPaint());    }    private Handler mHandler = new Handler() {        @Override        public void handleMessage(Message msg) {            switch (msg.what) {                case 0:                    if (mCoordinateX < (-mTextWidth)) {//文字滚动完了，从滚动区域的右边出来                        mCoordinateX = getWidth();                        invalidate();                        if (!mStopMarquee) {                            sendEmptyMessageDelayed(0, 30);                        }                    } else {                        mCoordinateX -= speed;                        invalidate();                        if (!mStopMarquee) {                            sendEmptyMessageDelayed(0, 30);                        }                                           }                    break;            }            super.handleMessage(msg);        }    };    public static boolean isEmpty(String str) {        return str == null || str.length() == 0;    }    public int dp2px(int dp) {        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, this.getResources().getDisplayMetrics());    }}

使用

<MarqueeTextView            android:id="@+id/text_sign_message"            android:layout_width="match_parent"            android:layout_height="31dp"            android:background="@color/sign_notice"            android:gravity="center_vertical"            android:singleLine="true"            android:textColor="@color/sign_notice_text"            android:textSize="@dimen/normal_13"/>

mSignMessage_text = (MarqueeTextView) mSignIntehralHead.findViewById(R.id.text_sign_message);mSignMessage_text.setText("签到奖励规则变更通知：连续第1、2、3、4、5、6、7天签到，分别送20、25、30、35、40、45、50积分,连续签到超过7天后，每天固定送50积分");

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