這期內(nèi)容當(dāng)中小編將會(huì)給大家?guī)碛嘘P(guān)怎么在Android中利用ProgressButton實(shí)現(xiàn)進(jìn)度條按鈕,文章內(nèi)容豐富且以專業(yè)的角度為大家分析和敘述,閱讀完這篇文章希望大家可以有所收獲。
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創(chuàng)建三個(gè)GradientDrawable作為按鈕背景、進(jìn)度條背景和進(jìn)度條前景,通過計(jì)算進(jìn)度條的百分比來設(shè)置寬度,然后調(diào)用invalidate()重繪。GradientDrawable設(shè)置顏色、圓角等參數(shù),當(dāng)然你也可以直接加載xml作為背景。
3.自定義參數(shù):
在values目錄建一個(gè)attrs.xml文件
3.按鈕類:
在setProgress方法中改變mProgress的值,然后調(diào)用invalidate()重繪,因?yàn)槲疫@里定義了一個(gè)minProgress(默認(rèn)為0),所以在計(jì)算進(jìn)度條寬度的時(shí)候,當(dāng)前進(jìn)度和最大進(jìn)度都要先減去minProgress再做除法。
if (progressWidth < mCornerRadius * 2) { progressWidth = mCornerRadius * 2; }
當(dāng)進(jìn)度條寬度小于2倍圓角半徑的時(shí)候,進(jìn)度條的圓角就和背景的圓角不一致,所以加上了上面這段代碼。
獲取寬度和高度其實(shí)用getWidth()和getHeight()也可以,只不過在設(shè)計(jì)器中沒法看到效果,所以我用了getMeasuredWidth()和getMeasuredHeight()。
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; } }
使用:
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上述就是小編為大家分享的怎么在Android中利用ProgressButton實(shí)現(xiàn)進(jìn)度條按鈕了,如果剛好有類似的疑惑,不妨參照上述分析進(jìn)行理解。如果想知道更多相關(guān)知識(shí),歡迎關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道。