四点钟走马灯-子夜

Master:

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.util.AttributeSet;

import android.view.Display;

import android.view.WindowManager;

import android.widget.TextView;

public class AutoScrollTextView extends TextView

{

// 支持滚动的走马灯

private Paint paint = null; // 画笔对象

private float viewWidth = 0f; // 滚动长度

private float textLength = 0f; // 文字长度

private float yPoint = 0f; // 文本Y轴的坐标

private float xPoint = 0f; // 文本x轴 的坐标

private String displayText = ""; // 显示的文字

private float temp_tx1 = 0.0f; // 文本当前长度

private boolean isStarting = false; // 文本滚动开关

private float temp_tx2 = 0x0f; // 文本当前变换的长度

public AutoScrollTextView(Context context, AttributeSet attrs)

{

super(context, attrs);

}

// 初始化自动滚动条,每次改变文字内容时，都需要重新初始化一次

@SuppressWarnings("deprecation")

public void initScrollTextView(WindowManager windowManager, String text)

{

paint = getPaint(); // 得到画笔,获取父类的textPaint

displayText = text; // 得到文字

textLength = paint.measureText(text);// 获得当前文本字符串长度

viewWidth = getWidth();// 获取宽度return mRight - mLeft;

if (viewWidth == 0)

{

if (windowManager != null)

{

Display display = windowManager.getDefaultDisplay(); // 获取当前屏幕的属性

viewWidth = display.getWidth();// 获取屏幕宽度

}

}

xPoint = textLength;

temp_tx1 = viewWidth + textLength;

temp_tx2 = viewWidth + textLength * 2; // 自己定义，文字变化多少

yPoint = this.getTextSize() + this.getPaddingTop(); // 文字的大小+距顶部的距离

}

// 开始滚动

public void starScroll()

{

isStarting = true; // 开始滚动

this.invalidate(); // 刷新屏幕

}

// 停止方法,停止滚动

public void stopScroll()

{

isStarting = false; // 停止滚动

this.invalidate(); // 刷新屏幕

}

// 重写onDraw方法

@Override

protected void onDraw(Canvas canvas)

{

if (isStarting)

{

canvas.drawText(displayText, temp_tx1 - xPoint, yPoint, paint);

xPoint += 2.6;

if (xPoint >= temp_tx2) // 当文字滚动到屏幕的最左边

xPoint = temp_tx1 - viewWidth; // 把文字设置到最右边开始

this.invalidate();// 刷新屏幕

}

super.onDraw(canvas);

}

}

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<com.view.AutoScrollTextView

            android:id="@+id/base_activity_atv_news"

            style="@style/shadow"

            android:layout_width="match_parent"

            android:layout_height="36dp"

            android:background="@drawable/pic_bg_marquee_news"

            android:gravity="center_vertical"

            android:paddingTop="4dp"

            android:singleLine="true"

            android:textColor="@color/white"

            android:textSize="@dimen/size_16sp" />

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tvNews = (AutoScrollTextView) findViewById(R.id.base_activity_atv_news);

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tvNews.initScrollTextView(getWindowManager(), strNews);

tvNews.starScroll();