Android progress bar learning, android progress bar

Android progress bar learning, android progress bar

Custom Attributes

<! -- RoundColor ring color roundProgressColor progress color roundWidth ring width textColor text color textSize text size max maximum textIsDisplayable show progress text style STROKE hollow FILL solid --> <declare-styleable name = "RoundProgressBar"> <attr name = "roundColor" format = "color"/> <attr name = "roundProgressColor" format = "color"/> <attr name = "roundWidth" format = "dimension"> </attr> <attr name = "textColor" format = "color"/> <attr name = "textSize" format = "dimension"/> <attr name = "max" format = "integer"> </attr> <attr name = "textIsDisplayable" format = "boolean"> </attr> <attr name = "style"> <enum name = "STROKE" value = "0"> </enum> <enum name = "FILL" value = "1"> </enum> </attr> </declare -styleable>

 

Public RoundProgressBar (Context context, AttributeSet attrs, int defStyleAttr) {super (context, attrs, defStyleAttr); mPaint = new Paint (); /*** get custom attributes */TypedArray typedArray = context. obtainStyledAttributes (attrs, R. styleable. roundProgressBar); // the background color mRoundColor = typedArray. getColor (R. styleable. roundProgressBar_roundColor, Color. RED); // progress color mRoundProgressColor = typedArray. getColor (R. styleable. roundProgressBar_roundProgressColor, Color. BLUE); // The width of the circle mRoundWidth = typedArray. getDimension (R. styleable. roundProgressBar_roundWidth, 20); // In The Middle Of The font color, mTextColor = typedArray. getColor (R. styleable. roundProgressBar_textColor, Color. BLUE); // The font size of the intermediate progress display (mTextSize = typedArray. getDimension (R. styleable. roundProgressBar_textSize, 15); // maximum mMax = typedArray. getInteger (R. styleable. roundProgressBar_max, 100); // whether the text displays mTextIsDisplayable = typedArray. getBoolean (R. styleable. roundProgressBar_textIsDisplayable, true); // solid or hollow mStyle = typedArray. getInt (R. styleable. roundProgressBar_style, 0); typedArray. recycle ();}

 

 

Draw

// The center of the circle int centerOfCircle = getWidth ()/2; // radius int radius = (int) (centerOfCircle-mRoundWidth/2); // set the brush mPaint. setAntiAlias (true); // the color of the ring mPaint. setColor (mRoundColor); // set the hollow mPaint. setStyle (Paint. style. STROKE); // The width of the paint brush mPaint. setStrokeWidth (mRoundWidth); // draw a circle canvas. drawCircle (centerOfCircle, centerOfCircle, radius, mPaint);/*** painting percentage */mPaint. setStrokeWidth (0); // font size mPaint. setText Size (mTextSize); // paint brush color mPaint. setColor (mTextColor); // The mPaint font. setTypeface (Typeface. DEFAULT_BOLD); // calculate the percentage int percent = (int) (float) mProgress/(float) mMax) * 100); // measure the font width float textWidth = mPaint. measureText (percent + "%"); // determines whether the progress text is not 0 and the style is hollow if (mTextIsDisplayable & percent! = 0 & mStyle = STROKE) {canvas. drawText (percent + "%", centerOfCircle-textWidth/2, centerOfCircle + textWidth/2, mPaint);}/*** set progress */mPaint. setColor (mRoundProgressColor); // paint width mPaint. setStrokeWidth (mRoundWidth); mPaint. setAntiAlias (true); RectF oval = new RectF (centerOfCircle-radius, centerOfCircle-radius, centerOfCircle + radius, centerOfCircle + radius); switch (mStyle) {case STROKE: // hollow mPaint. setStyle (Paint. style. STROKE); // draw an ARC/* start angle */canvas. drawArc (oval, 180,360 * mProgress/mMax, false, mPaint); break; case FILL: // solid mPaint. setStyle (Paint. style. FILL_AND_STROKE); // draw an arc if (mProgress! = 0) {canvas. drawArc (oval, 180,360 * mProgress/mMax, true, mPaint) ;}break ;}

 

Source code:

Https://github.com/ln0491/ProgressDemo