歌词效果制作

首先看一下效果图
大概的思想：先画出颜色为红色的一行文字，测量文字的宽度，假如说是1000，那么截取1000的十分之一的区域，把颜色为蓝色的的一行字画在合格矩形里面。
部分代码如下：
package com.example.custom.sz;import com.example.custom.R;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.AttributeSet;import android.view.View;/** *  * @author 吴传龙 * QQ:312037487 */public class ColorTrackView extends View {private Context mContext;private String mText;private int mTextSize;private int mTextOriginColor;// 文字原来的颜色private int mTextChangeColor;// 文字改变的额颜色private float mProgress;private Paint mPaint;private int mTextRealWidth;public void init(Context context, AttributeSet attrs, int defStyleAttr) {mContext = context;TypedArray ta = context.obtainStyledAttributes(attrs,R.styleable.colorTrackView);mText = ta.getString(R.styleable.colorTrackView_text);mTextSize = ta.getDimensionPixelSize(R.styleable.colorTrackView_text_size, mTextSize);mTextOriginColor = ta.getColor(R.styleable.colorTrackView_text_origin_color, mTextOriginColor);mTextChangeColor = ta.getColor(R.styleable.colorTrackView_text_change_color, mTextChangeColor);mProgress = ta.getFloat(R.styleable.colorTrackView_progress, 0);ta.recycle();mPaint = new Paint();mPaint.setAntiAlias(true);mPaint.setColor(mTextOriginColor);mPaint.setTextSize(mTextSize);measureText();}private int mHeight;@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {int width = measureWidth(widthMeasureSpec);mHeight = measureHeight(heightMeasureSpec);setMeasuredDimension(width, mHeight);}@Overridepublic void draw(Canvas canvas) {super.draw(canvas);mPaint.setColor(Color.RED);canvas.drawText(mText, getPaddingLeft(),getPaddingTop() - mPaint.ascent(), mPaint);if (drawTopText){canvas.save();mPaint.setColor(Color.BLUE);canvas.clipRect(getPaddingLeft(), 0, mProgress, mHeight);canvas.drawText(mText, getPaddingLeft(),getPaddingTop() - mPaint.ascent(), mPaint);canvas.restore();}}public void measureText() {mTextRealWidth = (int) mPaint.measureText(mText) - getPaddingLeft()- getPaddingRight();}private boolean drawTopText = false;public void setProgress(final int from, final int to) {new Thread() {public void run() {measureText();drawTopText = true;int go = 3000 / mTextRealWidth;while(true){for (int progress = 0; progress < mTextRealWidth;) {mPaint.setColor(mTextChangeColor);progress += go;mProgress = progress;postInvalidate();try {sleep(100);} catch (InterruptedException e) {}}drawTopText = false;postInvalidate();drawTopText = true;}};}.start();}public int measureWidth(int widthMeasureSpec) {int resultSize;int mode = MeasureSpec.getMode(widthMeasureSpec);int size = MeasureSpec.getSize(widthMeasureSpec);if (mode == MeasureSpec.EXACTLY) {resultSize = size;} else {resultSize = (int) (mPaint.measureText(mText) - getPaddingLeft() - getPaddingRight());if (mode == MeasureSpec.AT_MOST) {resultSize = Math.min(resultSize, size);}}return resultSize;}public int measureHeight(int heightMeasureSpec) {int resultSize;int mode = MeasureSpec.getMode(heightMeasureSpec);int size = MeasureSpec.getSize(heightMeasureSpec);if (mode == MeasureSpec.EXACTLY) {resultSize = size;} else {resultSize = (int) (mPaint.descent() - mPaint.ascent()+ getPaddingTop() + getPaddingBottom());if (mode == MeasureSpec.AT_MOST) {resultSize = Math.min(resultSize, size);}}return resultSize;}public ColorTrackView(Context context) {this(context, null, 0);}public ColorTrackView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init(context, attrs, defStyleAttr);}public ColorTrackView(Context context, AttributeSet attrs) {this(context, attrs, 0);}}
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