Android 进度条按钮ProgressButton的实现代码

 <?xml version="." encoding="utf-"? 
 <resources 
  <attr name="progressColor" format="color" / 
  <attr name="progressBackColor" format="color" / 
  <attr name="progress" format="integer" / 
  <attr name="minProgress" format="integer" / 
  <attr name="maxProgress" format="integer" / 
  <declare-styleable name="ProgressButton" 
   <attr name="progressColor" / 
   <attr name="progressBackColor" / 
   <attr name="buttonColor" format="color" / 
   <attr name="cornerRadius" format="dimension" / 
   <attr name="progress" / 
   <attr name="minProgress" / 
   <attr name="maxProgress" / 
   <attr name="progressMargin" format="dimension" / 
  </declare-styleable 
 </resources 

if (progressWidth < mCornerRadius * 2) {
 progressWidth = mCornerRadius * 2;
}

package com.cloud.customviews;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.drawable.GradientDrawable;
import android.support.v.widget.AppCompatButton;
import android.util.AttributeSet;
public class ProgressButton extends AppCompatButton {
private float mCornerRadius = ;
private float mProgressMargin = ;
private boolean mFinish;
private int mProgress;
private int mMaxProgress = ;
private int mMinProgress = ;
private GradientDrawable mDrawableButton;
private GradientDrawable mDrawableProgressBackground;
private GradientDrawable mDrawableProgress;
public ProgressButton(Context context, AttributeSet attrs) {
super(context, attrs);
initialize(context, attrs);
}
public ProgressButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initialize(context, attrs);
}
private void initialize(Context context, AttributeSet attrs) {
//Progress background drawable
mDrawableProgressBackground = new GradientDrawable();
//Progress drawable
mDrawableProgress = new GradientDrawable();
//Normal drawable
mDrawableButton = new GradientDrawable();
//Get default normal color
int defaultButtonColor = getResources().getColor(R.color.colorGray, null);
//Get default progress color
int defaultProgressColor = getResources().getColor(R.color.colorGreen, null);
//Get default progress background color
int defaultBackColor = getResources().getColor(R.color.colorGray, null);
TypedArray attr = context.obtainStyledAttributes(attrs, R.styleable.ProgressButton);
try {
mProgressMargin = attr.getDimension(R.styleable.ProgressButton_progressMargin, mProgressMargin);
mCornerRadius = attr.getDimension(R.styleable.ProgressButton_cornerRadius, mCornerRadius);
//Get custom normal color
int buttonColor = attr.getColor(R.styleable.ProgressButton_buttonColor, defaultButtonColor);
//Set normal color
mDrawableButton.setColor(buttonColor);
//Get custom progress background color
int progressBackColor = attr.getColor(R.styleable.ProgressButton_progressBackColor, defaultBackColor);
//Set progress background drawable color
mDrawableProgressBackground.setColor(progressBackColor);
//Get custom progress color
int progressColor = attr.getColor(R.styleable.ProgressButton_progressColor, defaultProgressColor);
//Set progress drawable color
mDrawableProgress.setColor(progressColor);
//Get default progress
mProgress = attr.getInteger(R.styleable.ProgressButton_progress, mProgress);
//Get minimum progress
mMinProgress = attr.getInteger(R.styleable.ProgressButton_minProgress, mMinProgress);
//Get maximize progress
mMaxProgress = attr.getInteger(R.styleable.ProgressButton_maxProgress, mMaxProgress);
} finally {
attr.recycle();
}
//Set corner radius
mDrawableButton.setCornerRadius(mCornerRadius);
mDrawableProgressBackground.setCornerRadius(mCornerRadius);
mDrawableProgress.setCornerRadius(mCornerRadius - mProgressMargin);
setBackgroundDrawable(mDrawableButton);
mFinish = false;
}
@Override
protected void onDraw(Canvas canvas) {
if (mProgress   mMinProgress && mProgress <= mMaxProgress && !mFinish) {
//Calculate the width of progress
float progressWidth =
(float) getMeasuredWidth() * ((float) (mProgress - mMinProgress) / mMaxProgress - mMinProgress);
//If progress width less than x corner radius, the radius of progress will be wrong
if (progressWidth < mCornerRadius * ) {
progressWidth = mCornerRadius * ;
}
//Set rect of progress
mDrawableProgress.setBounds((int) mProgressMargin, (int) mProgressMargin,
(int) (progressWidth - mProgressMargin), getMeasuredHeight() - (int) mProgressMargin);
//Draw progress
mDrawableProgress.draw(canvas);
if (mProgress == mMaxProgress) {
setBackgroundDrawable(mDrawableButton);
mFinish = true;
}
}
super.onDraw(canvas);
}
/**
* Set current progress
*/
public void setProgress(int progress) {
if (!mFinish) {
mProgress = progress;
setBackgroundDrawable(mDrawableProgressBackground);
invalidate();
}
}
public void setMaxProgress(int maxProgress) {
mMaxProgress = maxProgress;
}
public void setMinProgress(int minProgress) {
mMinProgress = minProgress;
}
public void reset() {
mFinish = false;
mProgress = mMinProgress;
}
}

<com.cloud.customviews.ProgressButton
android:id="@+id/button_progress_green"
android:layout_width="dp"
android:layout_height="wrap_content"
android:layout_marginTop="dp"
android:textAllCaps="false"
android:textColor="@color/colorWhite"
android:text="@string/button_progress"
app:cornerRadius="dp"
app:progressMargin="dp"
app:progressColor="@color/colorGreen"
app:buttonColor="@color/colorGreen" /