Android 数字进度条NumberProgressBar

 

转自：http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2014/0813/1645.html

原生的ProgressBar在不同的主题下风格迥异，有矩形条状的，有代表加载进行中的圆圈风格的，在4.0的holo风格下这些ProgressBar都还比较好看，但是在非holo风格下让人厌烦。我不排斥使用原生控件，但是有时我们的app可能比较个性化，需要更有个性的ProgressBar。

下面这款开源ProgressBar就比较有个性。

NumberProgressBar

github地址 https://github.com/daimajia/NumberProgressBar

该控件虽然也叫ProgressBar，但是和sdk中的ProgressBar控件没有任何继承关系，直接继承子view。控件分为三部分，如图：

用法：

xml中

1.  
   <com.daimajia.numberprogressbar.NumberProgressBar
2.  
   android:id="@+id/number_progress_bar"
3.  
   style="@style/NumberProgressBar_Default" />

除了默认的style，你还可以设置成如下style：

NumberProgressBar_Default 

NumberProgressBar_Passing_Green 

NumberProgressBar_Relax_Blue 

NumberProgressBar_Grace_Yellow 

NumberProgressBar_Warning_Red 

NumberProgressBar_Funny_Orange 

NumberProgressBar_Beauty_Red 

NumberProgressBar_Twinkle_Night

对应的外观如下：

除了直接用已经定义好的style，你还可以通过设置属性来改变外观。

NumberProgressBar的一些属性：

reached area和unreached area

• 颜色

• 高度

文字部分，描述进程的百分比数字

• 颜色

• 字体大小

• 是否可见

• 和reached area与unreached area之间的距离

整个bar

• 最大进度 max progress

• 当前进度 current progress

比如默认情况下

1.  
   <com.daimajia.numberprogressbar.NumberProgressBar
2.  
   android:layout_width="wrap_content"
3.  
   android:layout_height="wrap_content"
4.  
   custom:progress_unreached_color="#CCCCCC"
5.  
   custom:progress_reached_color="#3498DB"
6.  
   custom:progress_unreached_bar_height="0.75dp"
7.  
   custom:progress_reached_bar_height="1.5dp"
8.  
   custom:progress_text_size="10sp"
9.  
   custom:progress_text_color="#3498DB"
10.  
    custom:progress_text_offset="1dp"
11.  
    custom:progress_text_visibility="visible"
12.  
    custom:max="100"
13.  
    custom:progress="80" />

能体现进度的动画效果：

如上面的第一张图所示，github项目中的demo实现了NumberProgressBar的动画效果，但是这个动画效果并不是NumberProgressBar自带的，而是在外部通过不断调用setProgress做到的，demo中

1.  
   final NumberProgressBar bnp = (NumberProgressBar)findViewById(R.id.numberbar1);
2.  
   counter = 0;
3.  
   timer = new Timer();
4.  
   timer.schedule(new TimerTask() {
5.  
   @Override
6.  
   public void run() {
7.  
   runOnUiThread(new Runnable() {
8.  
   @Override
9.  
   public void run() {
10.  
    bnp.incrementProgressBy(1);
11.  
    counter ++;
12.  
    if (counter == 110) {
13.  
    bnp.setProgress(0);
14.  
    counter=0;
15.  
    }
16.  
    }
17.  
    });
18.  
    }
19.  
    }, 1000, 100);

incrementProgressBy表示Progress在现有基础上增加多少，从上面的代码可以看出，demo中 NumberProgressBar 的动态增加是采用timer实现的，也可以用属性动画来实现，当然在现实运用中可能是一些跟网络有关的事件来实现。

NumberProgressBar的源码实现：

如果你已经学会了如何自定义一个view，那么NumberProgressBar的代码是很容易看懂的。这里想指出的是有个细节我个人持保留意见，那就是作者在onMeasure方法中调用了自己实现的measure方法，在View的绘制中是先measure然后再在measure方法中调用onMeasure，而继承子view的子类一般只重写onMeasure方法。虽然这里并不会引起什么错误，但是我觉得还是遵守view的绘制流程比较好。

最后贴出NumberProgressBar的java部分的代码，代码不多：

1.  
   package com.daimajia.numberprogressbar;
2.  
   import android.content.Context;
3.  
   import android.content.res.TypedArray;
4.  
   import android.graphics.Canvas;
5.  
   import android.graphics.Color;
6.  
   import android.graphics.Paint;
7.  
   import android.graphics.RectF;
8.  
   import android.os.Bundle;
9.  
   import android.os.Parcelable;
10.  
    import android.util.AttributeSet;
11.  
    import android.view.View;
12.  
    /**
13.  
    * Created by daimajia on 14-4-30.
14.  
    */
15.  
    public class NumberProgressBar extends View {
16.  
    private Context mContext;
17.  
    /**
18.  
    * The max progress, default is 100
19.  
    */
20.  
    private int mMax = 100;
21.  
    /**
22.  
    * current progress, can not exceed the max progress.
23.  
    */
24.  
    private int mProgress = 0;
25.  
    /**
26.  
    * the progress area bar color
27.  
    */
28.  
    private int mReachedBarColor;
29.  
    /**
30.  
    * the bar unreached area color.
31.  
    */
32.  
    private int mUnreachedBarColor;
33.  
    /**
34.  
    * the progress text color.
35.  
    */
36.  
    private int mTextColor;
37.  
    /**
38.  
    * the progress text size
39.  
    */
40.  
    private float mTextSize;
41.  
    /**
42.  
    * the height of the reached area
43.  
    */
44.  
    private float mReachedBarHeight;
45.  
    /**
46.  
    * the height of the unreached area
47.  
    */
48.  
    private float mUnreachedBarHeight;
49.  
    private final int default_text_color = Color.rgb(66, 145, 241);
50.  
    private final int default_reached_color = Color.rgb(66,145,241);
51.  
    private final int default_unreached_color = Color.rgb(204, 204, 204);
52.  
    private final float default_progress_text_offset;
53.  
    private final float default_text_size;
54.  
    private final float default_reached_bar_height;
55.  
    private final float default_unreached_bar_height;
56.  
    /**
57.  
    * for save and restore instance of progressbar.
58.  
    */
59.  
    private static final String INSTANCE_STATE = "saved_instance";
60.  
    private static final String INSTANCE_TEXT_COLOR = "text_color";
61.  
    private static final String INSTANCE_TEXT_SIZE = "text_size";
62.  
    private static final String INSTANCE_REACHED_BAR_HEIGHT = "reached_bar_height";
63.  
    private static final String INSTANCE_REACHED_BAR_COLOR = "reached_bar_color";
64.  
    private static final String INSTANCE_UNREACHED_BAR_HEIGHT = "unreached_bar_height";
65.  
    private static final String INSTANCE_UNREACHED_BAR_COLOR = "unreached_bar_color";
66.  
    private static final String INSTANCE_MAX = "max";
67.  
    private static final String INSTANCE_PROGRESS = "progress";
68.  
    private static final int PROGRESS_TEXT_VISIBLE = 0;
69.  
    private static final int PROGRESS_TEXT_INVISIBLE = 1;
70.  
    /**
71.  
    * the width of the text that to be drawn
72.  
    */
73.  
    private float mDrawTextWidth;
74.  
    /**
75.  
    * the drawn text start
76.  
    */
77.  
    private float mDrawTextStart;
78.  
    /**
79.  
    *the drawn text end
80.  
    */
81.  
    private float mDrawTextEnd;
82.  
    /**
83.  
    * the text that to be drawn in onDraw()
84.  
    */
85.  
    private String mCurrentDrawText;
86.  
    /**
87.  
    * the Paint of the reached area.
88.  
    */
89.  
    private Paint mReachedBarPaint;
90.  
    /**
91.  
    * the Painter of the unreached area.
92.  
    */
93.  
    private Paint mUnreachedBarPaint;
94.  
    /**
95.  
    * the Painter of the progress text.
96.  
    */
97.  
    private Paint mTextPaint;
98.  
    /**
99.  
    * Unreached Bar area to draw rect.
100.  
     */
101.  
     private RectF mUnreachedRectF = new RectF(0,0,0,0);
102.  
     /**
103.  
     * reached bar area rect.
104.  
     */
105.  
     private RectF mReachedRectF = new RectF(0,0,0,0);
106.  
     /**
107.  
     * the progress text offset.
108.  
     */
109.  
     private float mOffset;
110.  
     /**
111.  
     * determine if need to draw unreached area
112.  
     */
113.  
     private boolean mDrawUnreachedBar = true;
114.  
     private boolean mDrawReachedBar = true;
115.  
     private boolean mIfDrawText = true;
116.  
     public enum ProgressTextVisibility{
117.  
     Visible,Invisible
118.  
     };
119.  
     public NumberProgressBar(Context context) {
120.  
     this(context, null);
121.  
     }
122.  
     public NumberProgressBar(Context context, AttributeSet attrs) {
123.  
     this(context, attrs, R.attr.numberProgressBarStyle);
124.  
     }
125.  
     public NumberProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
126.  
     super(context, attrs, defStyleAttr);
127.  
     mContext = context;
128.  
     default_reached_bar_height = dp2px(1.5f);
129.  
     default_unreached_bar_height = dp2px(1.0f);
130.  
     default_text_size = sp2px(10);
131.  
     default_progress_text_offset = dp2px(3.0f);
132.  
     //load styled attributes.
133.  
     final TypedArray attributes = context.getTheme().obtainStyledAttributes(attrs, R.styleable.NumberProgressBar,
134.  
     defStyleAttr, 0);
135.  
     mReachedBarColor = attributes.getColor(R.styleable.NumberProgressBar_progress_reached_color, default_reached_color);
136.  
     mUnreachedBarColor = attributes.getColor(R.styleable.NumberProgressBar_progress_unreached_color,default_unreached_color);
137.  
     mTextColor = attributes.getColor(R.styleable.NumberProgressBar_progress_text_color,default_text_color);
138.  
     mTextSize = attributes.getDimension(R.styleable.NumberProgressBar_progress_text_size, default_text_size);
139.  
     mReachedBarHeight = attributes.getDimension(R.styleable.NumberProgressBar_progress_reached_bar_height,default_reached_bar_height);
140.  
     mUnreachedBarHeight = attributes.getDimension(R.styleable.NumberProgressBar_progress_unreached_bar_height,default_unreached_bar_height);
141.  
     mOffset = attributes.getDimension(R.styleable.NumberProgressBar_progress_text_offset,default_progress_text_offset);
142.  
     int textVisible = attributes.getInt(R.styleable.NumberProgressBar_progress_text_visibility,PROGRESS_TEXT_VISIBLE);
143.  
     if(textVisible != PROGRESS_TEXT_VISIBLE){
144.  
     mIfDrawText = false;
145.  
     }
146.  
     setProgress(attributes.getInt(R.styleable.NumberProgressBar_progress,0));
147.  
     setMax(attributes.getInt(R.styleable.NumberProgressBar_max, 100));
148.  
     //
149.  
     attributes.recycle();
150.  
     initializePainters();
151.  
     }
152.  
     @Override
153.  
     protected int getSuggestedMinimumWidth() {
154.  
     return (int)mTextSize;
155.  
     }
156.  
     @Override
157.  
     protected int getSuggestedMinimumHeight() {
158.  
     return Math.max((int)mTextSize,Math.max((int)mReachedBarHeight,(int)mUnreachedBarHeight));
159.  
     }
160.  
     @Override
161.  
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
162.  
     setMeasuredDimension(measure(widthMeasureSpec,true), measure(heightMeasureSpec,false));
163.  
     }
164.  
     private int measure(int measureSpec,boolean isWidth){
165.  
     int result;
166.  
     int mode = MeasureSpec.getMode(measureSpec);
167.  
     int size = MeasureSpec.getSize(measureSpec);
168.  
     int padding = isWidth?getPaddingLeft()+getPaddingRight():getPaddingTop()+getPaddingBottom();
169.  
     if(mode == MeasureSpec.EXACTLY){
170.  
     result = size;
171.  
     }else{
172.  
     result = isWidth ? getSuggestedMinimumWidth() : getSuggestedMinimumHeight();
173.  
     result += padding;
174.  
     if(mode == MeasureSpec.AT_MOST){
175.  
     if(isWidth) {
176.  
     result = Math.max(result, size);
177.  
     }
178.  
     else{
179.  
     result = Math.min(result, size);
180.  
     }
181.  
     }
182.  
     }
183.  
     return result;
184.  
     }
185.  
     @Override
186.  
     protected void onDraw(Canvas canvas) {
187.  
     if(mIfDrawText){
188.  
     calculateDrawRectF();
189.  
     }else{
190.  
     calculateDrawRectFWithoutProgressText();
191.  
     }
192.  
     if(mDrawReachedBar){
193.  
     canvas.drawRect(mReachedRectF,mReachedBarPaint);
194.  
     }
195.  
     if(mDrawUnreachedBar) {
196.  
     canvas.drawRect(mUnreachedRectF, mUnreachedBarPaint);
197.  
     }
198.  
     if(mIfDrawText)
199.  
     canvas.drawText(mCurrentDrawText,mDrawTextStart,mDrawTextEnd,mTextPaint);
200.  
     }
201.  
     private void initializePainters(){
202.  
     mReachedBarPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
203.  
     mReachedBarPaint.setColor(mReachedBarColor);
204.  
     mUnreachedBarPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
205.  
     mUnreachedBarPaint.setColor(mUnreachedBarColor);
206.  
     mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
207.  
     mTextPaint.setColor(mTextColor);
208.  
     mTextPaint.setTextSize(mTextSize);
209.  
     }
210.  
     private void calculateDrawRectFWithoutProgressText(){
211.  
     mReachedRectF.left = getPaddingLeft();
212.  
     mReachedRectF.top = getHeight()/2.0f - mReachedBarHeight / 2.0f;
213.  
     mReachedRectF.right = (getWidth() - getPaddingLeft() - getPaddingRight() )/(getMax()*1.0f) * getProgress() + getPaddingLeft();
214.  
     mReachedRectF.bottom = getHeight()/2.0f + mReachedBarHeight / 2.0f;
215.  
     mUnreachedRectF.left = mReachedRectF.right;
216.  
     mUnreachedRectF.right = getWidth() - getPaddingRight();
217.  
     mUnreachedRectF.top = getHeight()/2.0f + - mUnreachedBarHeight / 2.0f;
218.  
     mUnreachedRectF.bottom = getHeight()/2.0f + mUnreachedBarHeight / 2.0f;
219.  
     }
220.  
     private void calculateDrawRectF(){
221.  
     mCurrentDrawText = String.format("%d%%",getProgress()*100/getMax());
222.  
     mDrawTextWidth = mTextPaint.measureText(mCurrentDrawText);
223.  
     if(getProgress() == 0){
224.  
     mDrawReachedBar = false;
225.  
     mDrawTextStart = getPaddingLeft();
226.  
     }else{
227.  
     mDrawReachedBar = true;
228.  
     mReachedRectF.left = getPaddingLeft();
229.  
     mReachedRectF.top = getHeight()/2.0f - mReachedBarHeight / 2.0f;
230.  
     mReachedRectF.right = (getWidth() - getPaddingLeft() - getPaddingRight() )/(getMax()*1.0f) * getProgress() - mOffset + getPaddingLeft();
231.  
     mReachedRectF.bottom = getHeight()/2.0f + mReachedBarHeight / 2.0f;
232.  
     mDrawTextStart = (mReachedRectF.right + mOffset);
233.  
     }
234.  
     mDrawTextEnd = (int) ((getHeight() / 2.0f) - ((mTextPaint.descent() + mTextPaint.ascent()) / 2.0f)) ;
235.  
     if((mDrawTextStart + mDrawTextWidth )>= getWidth() - getPaddingRight()){
236.  
     mDrawTextStart = getWidth() - getPaddingRight() - mDrawTextWidth;
237.  
     mReachedRectF.right = mDrawTextStart - mOffset;
238.  
     }
239.  
     float unreachedBarStart = mDrawTextStart + mDrawTextWidth + mOffset;
240.  
     if(unreachedBarStart >= getWidth() - getPaddingRight()){
241.  
     mDrawUnreachedBar = false;
242.  
     }else{
243.  
     mDrawUnreachedBar = true;
244.  
     mUnreachedRectF.left = unreachedBarStart;
245.  
     mUnreachedRectF.right = getWidth() - getPaddingRight();
246.  
     mUnreachedRectF.top = getHeight()/2.0f + - mUnreachedBarHeight / 2.0f;
247.  
     mUnreachedRectF.bottom = getHeight()/2.0f + mUnreachedBarHeight / 2.0f;
248.  
     }
249.  
     }
250.  
     /**
251.  
     * get progress text color
252.  
     * @return progress text color
253.  
     */
254.  
     public int getTextColor() {
255.  
     return mTextColor;
256.  
     }
257.  
     /**
258.  
     * get progress text size
259.  
     * @return progress text size
260.  
     */
261.  
     public float getProgressTextSize() {
262.  
     return mTextSize;
263.  
     }
264.  
     public int getUnreachedBarColor() {
265.  
     return mUnreachedBarColor;
266.  
     }
267.  
     public int getReachedBarColor() {
268.  
     return mReachedBarColor;
269.  
     }
270.  
     public int getProgress() {
271.  
     return mProgress;
272.  
     }
273.  
     public int getMax() {
274.  
     return mMax;
275.  
     }
276.  
     public float getReachedBarHeight(){
277.  
     return mReachedBarHeight;
278.  
     }
279.  
     public float getUnreachedBarHeight(){
280.  
     return mUnreachedBarHeight;
281.  
     }
282.  
     public void setProgressTextSize(float TextSize) {
283.  
     this.mTextSize = TextSize;
284.  
     mTextPaint.setTextSize(mTextSize);
285.  
     invalidate();
286.  
     }
287.  
     public void setProgressTextColor(int TextColor) {
288.  
     this.mTextColor = TextColor;
289.  
     mTextPaint.setColor(mTextColor);
290.  
     invalidate();
291.  
     }
292.  
     public void setUnreachedBarColor(int BarColor) {
293.  
     this.mUnreachedBarColor = BarColor;
294.  
     mUnreachedBarPaint.setColor(mReachedBarColor);
295.  
     invalidate();
296.  
     }
297.  
     public void setReachedBarColor(int ProgressColor) {
298.  
     this.mReachedBarColor = ProgressColor;
299.  
     mReachedBarPaint.setColor(mReachedBarColor);
300.  
     invalidate();
301.  
     }
302.  
     public void setMax(int Max) {
303.  
     if(Max > 0){
304.  
     this.mMax = Max;
305.  
     invalidate();
306.  
     }
307.  
     }
308.  
     public void incrementProgressBy(int by){
309.  
     if(by > 0){
310.  
     setProgress(getProgress() + by);
311.  
     }
312.  
     }
313.  
     public void setProgress(int Progress) {
314.  
     if(Progress <= getMax() && Progress >= 0){
315.  
     this.mProgress = Progress;
316.  
     invalidate();
317.  
     }
318.  
     }
319.  
     @Override
320.  
     protected Parcelable onSaveInstanceState() {
321.  
     final Bundle bundle = new Bundle();
322.  
     bundle.putParcelable(INSTANCE_STATE,super.onSaveInstanceState());
323.  
     bundle.putInt(INSTANCE_TEXT_COLOR,getTextColor());
324.  
     bundle.putFloat(INSTANCE_TEXT_SIZE, getProgressTextSize());
325.  
     bundle.putFloat(INSTANCE_REACHED_BAR_HEIGHT,getReachedBarHeight());
326.  
     bundle.putFloat(INSTANCE_UNREACHED_BAR_HEIGHT,getUnreachedBarHeight());
327.  
     bundle.putInt(INSTANCE_REACHED_BAR_COLOR,getReachedBarColor());
328.  
     bundle.putInt(INSTANCE_UNREACHED_BAR_COLOR,getUnreachedBarColor());
329.  
     bundle.putInt(INSTANCE_MAX,getMax());
330.  
     bundle.putInt(INSTANCE_PROGRESS,getProgress());
331.  
     return bundle;
332.  
     }
333.  
     @Override
334.  
     protected void onRestoreInstanceState(Parcelable state) {
335.  
     if(state instanceof Bundle){
336.  
     final Bundle bundle = (Bundle)state;
337.  
     mTextColor = bundle.getInt(INSTANCE_TEXT_COLOR);
338.  
     mTextSize = bundle.getFloat(INSTANCE_TEXT_SIZE);
339.  
     mReachedBarHeight = bundle.getFloat(INSTANCE_REACHED_BAR_HEIGHT);
340.  
     mUnreachedBarHeight = bundle.getFloat(INSTANCE_UNREACHED_BAR_HEIGHT);
341.  
     mReachedBarColor = bundle.getInt(INSTANCE_REACHED_BAR_COLOR);
342.  
     mUnreachedBarColor = bundle.getInt(INSTANCE_UNREACHED_BAR_COLOR);
343.  
     initializePainters();
344.  
     setMax(bundle.getInt(INSTANCE_MAX));
345.  
     setProgress(bundle.getInt(INSTANCE_PROGRESS));
346.  
     super.onRestoreInstanceState(bundle.getParcelable(INSTANCE_STATE));
347.  
     return;
348.  
     }
349.  
     super.onRestoreInstanceState(state);
350.  
     }
351.  
     public float dp2px(float dp) {
352.  
     final float scale = getResources().getDisplayMetrics().density;
353.  
     return dp * scale + 0.5f;
354.  
     }
355.  
     public float sp2px(float sp){
356.  
     final float scale = getResources().getDisplayMetrics().scaledDensity;
357.  
     return sp * scale;
358.  
     }
359.  
     public void setProgressTextVisibility(ProgressTextVisibility visibility){
360.  
     if(visibility == ProgressTextVisibility.Visible){
361.  
     mIfDrawText = true;
362.  
     }else{
363.  
     mIfDrawText = false;
364.  
     }
365.  
     invalidate();
366.  
     }
367.