DigitalView.java

package com.jerome.widget;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout;

import com.jerome.lib_song.R;

public class DigitalView extends LinearLayout {
	private int mDigitalBit; // 数字的位数：double数值类型包含小数点和小数位

	private DigitalItemView[] mChildren;

	public DigitalView(Context context) {
		super(context);
		initChildren(context, R.drawable.digital_number, 1);
	}

	public DigitalView(Context context, AttributeSet attrs) {
		super(context, attrs);

		TypedArray a = context.obtainStyledAttributes(attrs,
				R.styleable.DigitalView);
		int bit = a.getInt(R.styleable.DigitalView_bit, 13);
		int resId = a.getResourceId(R.styleable.DigitalView_digitalImg,
				R.drawable.digital_number);
		initChildren(context, resId, bit);
	}

	public int getDigitalBit() {
		return mDigitalBit;
	}

	private void initChildren(Context context, int resId, int bit) {
		Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(),
				resId);
		LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,
				bitmap.getHeight() / 11);
		mDigitalBit = bit;
		mChildren = new DigitalItemView[bit];
		for (int i = 0; i < mDigitalBit; i++) {
			mChildren[mDigitalBit - 1 - i] = new DigitalItemView(context,
					bitmap);
			addView(mChildren[mDigitalBit - 1 - i], i, params);
		}
		setDigital(0.0);
	}

	public void setDigital(long digital) {
		int log10 = Math.max(0, (int) Math.log10(digital));

		// 不显示前面的零
		for (int i = mDigitalBit - 1; i > log10; i--) {
			mChildren[i].setVisibility(View.GONE);
		}

		// 显示整数部分（除个位数）
		for (int i = log10; i > 0; i--) {
			int base = (int) Math.pow(10, i);
			int temp = (int) (digital / base);
			digital = (int) (digital % base);

			mChildren[i].setVisibility(View.VISIBLE);
			mChildren[i].setDigital(temp);
		}

		// 显示个位数，即使个位数为零，也要显示出来。
		mChildren[0].setVisibility(View.VISIBLE);
		mChildren[0].setDigital((int) (digital % 10));
	}

	public void setDigital(double fdigital) {
		long digital = (long) fdigital;
		int log10 = Math.max(0, (int) Math.log10(digital));

		// 不显示前面的零
		for (int i = mDigitalBit - 1, n = log10 + 3; i > n; i--) {
			mChildren[i].setVisibility(View.GONE);
		}

		// 显示整数部分（除个位数和小数）
		for (int i = log10 + 3; i >= 4; i--) {
			int base = (int) Math.pow(10, i - 3);
			int temp = (int) (digital / base);
			digital = (int) (digital % base);

			mChildren[i].setVisibility(View.VISIBLE);
			mChildren[i].setDigital(temp);
		}

		// 显示个位数
		mChildren[3].setVisibility(View.VISIBLE);
		mChildren[3].setDigital((int) (digital % 10));

		// 显示小数点
		mChildren[2].setVisibility(VISIBLE);
		mChildren[2].setDigital(10);

		// 显示小数部分
		// fdigital = fdigital - Math.floor(fdigital);
		// digital = (long) (fdigital * 100);
		digital = (long) (fdigital * 100 % 100);
		for (int i = 1; i >= 0; i--) {
			int basee = (int) Math.pow(10, i);
			int temp = (int) (digital / basee);
			digital = (int) (digital % basee);

			mChildren[i].setVisibility(View.VISIBLE);
			mChildren[i].setDigital(temp);
		}
	}
}