Android单行文本跑马灯控件

public class AutoScrollTextView extends TextView implements OnClickListener {
public final static String TAG = AutoScrollTextView.class.getSimpleName();
private int runNum = 1;// 滚动次数
private float textLength = 0f;// 文本长度
private float viewWidth = 0f;
private float step = 0f;// 文字的横坐标
private float y = 0f;// 文字的纵坐标
private float temp_view_plus_text_length = 0.0f;// 用于计算的临时变量
private float temp_view_plus_two_text_length = 0.0f;// 用于计算的临时变量
public boolean isStarting = false;// 是否开始滚动
private Paint paint = null;// 绘图样式
private Paint paint1 = null;// 绘图样式
private String text = “”;// 文本内容
private boolean isFade = true;// 是否加影子
private float layout_width = 168f;

public float getLayout_width() {
    return layout_width;
}

public void setLayout_width(float layoutWidth) {
    layout_width = layoutWidth;
}

public boolean isFade() {
    return isFade;
}

public void setFade(boolean isFade) {
    this.isFade = isFade;
}

public AutoScrollTextView(Context context) {
    super(context);
    initView();
}

public AutoScrollTextView(Context context, AttributeSet attrs) {
    super(context, attrs);
    initView();
}

public AutoScrollTextView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    initView();
}

/** */
/**
 * 初始化控件
 */
private void initView() {
    setOnClickListener(this);
}

/** */
/**
 * 文本初始化,每次更改文本内容或者文本效果等之后都需要重新初始化一下
 */
public void init(WindowManager windowManager) {
    paint = getPaint();
    paint1 = new Paint();
    paint1.setColor(Color.WHITE);
    paint1.setTextSize(getTextSize());
    text = getText().toString();
    textLength = paint.measureText(text);
    viewWidth = layout_width * LogoActivity.screenHeight / 960;
    if (textLength > viewWidth * 2) {
        isStarting = true;
    }
    Log.e("    textLength      ", textLength + "         " + viewWidth);
    if (viewWidth == 0) {
        if (windowManager != null) {
            Display display = windowManager.getDefaultDisplay();
            viewWidth = display.getWidth();
        }
    }
    temp_view_plus_text_length = viewWidth + textLength;
    temp_view_plus_two_text_length = viewWidth + textLength * 2;
    step = temp_view_plus_text_length;
    y = getTextSize() + getPaddingTop();
}

@Override
public Parcelable onSaveInstanceState() {
    Parcelable superState = super.onSaveInstanceState();
    SavedState ss = new SavedState(superState);

    ss.step = step;
    ss.isStarting = isStarting;

    return ss;

}

@Override
public void onRestoreInstanceState(Parcelable state) {
    if (!(state instanceof SavedState)) {
        super.onRestoreInstanceState(state);
        return;
    }
    SavedState ss = (SavedState) state;
    super.onRestoreInstanceState(ss.getSuperState());

    step = ss.step;
    isStarting = ss.isStarting;

}

public static class SavedState extends BaseSavedState {
    public boolean isStarting = false;
    public float step = 0.0f;

    SavedState(Parcelable superState) {
        super(superState);
    }

    @Override
    public void writeToParcel(Parcel out, int flags) {
        super.writeToParcel(out, flags);
        out.writeBooleanArray(new boolean[] { isStarting });
        out.writeFloat(step);
    }

    public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() {

        public SavedState[] newArray(int size) {
            return new SavedState[size];
        }

        @Override
        public SavedState createFromParcel(Parcel in) {
            return new SavedState(in);
        }
    };

    private SavedState(Parcel in) {
        super(in);
        boolean[] b = null;
        in.readBooleanArray(b);
        if (b != null && b.length > 0)
            isStarting = b[0];
        step = in.readFloat();
    }
}

/** */
/**
 * 开始滚动
 */
public void startScroll() {
    isStarting = true;
    invalidate();
}

/** */
/**
 * 停止滚动
 */
public void stopScroll() {
    isStarting = false;
    runNum = 1;
    invalidate();

}

@Override
public void onDraw(Canvas canvas) {
    if (isFade)canvas.drawText(text, temp_view_plus_text_length - step, y, paint1);
    canvas.drawText(text, temp_view_plus_text_length - step, y - 1, paint);
    if (!isStarting) {
        return;
    }
    step += 1;
    if (step > temp_view_plus_two_text_length) {
        step = textLength - viewWidth;
        runNum--;

    }
    if (runNum == 0 && step == temp_view_plus_text_length) {
        isStarting = false;
    }
    invalidate();

}

@Override
public void onClick(View v) {

// if (isStarting)
// stopScroll();
// else
// startScroll();

}

}

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