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不懂Android自定義View如何實現加載進度條效果？？其實想解決這個問題也不難，下面讓小編帶著大家一起學習怎么去解決，希望大家閱讀完這篇文章后大所收獲。
效果圖：
下面就以水平的進度條為列進行講解：
1.首先還是在attrs.xml文件中自定義我們需要的屬性：
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="GradientProgressBar"> <attr name="textSize" format="dimension" /> <attr name="textColor" format="color" /> <attr name="bgColor" format="color" /> <attr name="startColor" format="color" /> <attr name="endColor" format="color" /> <attr name="rectRadius" format="dimension" /> <attr name="loadSpeed" format="integer" /> <attr name="lineWidth" format="dimension" /> </declare-styleable> <declare-styleable name="RoundProgressBar"> <attr name="textSizeRound" format="dimension" /> <attr name="textColorRound" format="color" /> <attr name="bgColorRound" format="color" /> <attr name="currentColorRound" format="color" /> <attr name="circleWidthRound" format="dimension" /> <attr name="loadSpeedRound" format="integer" /> </declare-styleable> </resources>
2.獲取我們的自定義屬性：
/**
* 字體大小
*/
private int mTextSize;
/**
* 字體顏色
*/
private int mTextColor;
/**
* 漸變開始的顏色
*/
private int mStartColor;
/**
* 漸變結束的顏色
*/
private int mEndColor;
/**
* 進度條的寬
*/
private int mProgressWidth;
/**
* 進度條的圓角大小
*/
private int mRadius;
/**
* 默認進度條的顏色
*/
private int mBgColor;
/**
* 進度條的當前進度
*/
private float mCurrentProgress;
/**
* 加載的速度
*/
private int mLoadSpeed;
private String mContent="0%";
private Rect mBounds;
private Paint mPaint;
public GradientProgressBar(Context context) {
this(context, null);
}
public GradientProgressBar(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public GradientProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
TypedArray array = context.getTheme().obtainStyledAttributes(attrs, R.styleable.GradientProgressBar, defStyleAttr, 0);
int count = array.getIndexCount();
for (int i = 0; i < count; i++) {
int index = array.getIndex(i);
switch (index) {
case R.styleable.GradientProgressBar_textSize:
/**
* 默認設置為16sp，TypeValue也可以把sp轉化為px
*/
mTextSize = array.getDimensionPixelSize(index, (int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics()));
break;
case R.styleable.GradientProgressBar_textColor:
/**
* 默認設置為黑色
*/
mTextColor = array.getColor(index, Color.BLACK);
break;
case R.styleable.GradientProgressBar_startColor:
mStartColor = array.getColor(index, Color.BLACK);
break;
case R.styleable.GradientProgressBar_endColor:
mEndColor = array.getColor(index, Color.BLACK);
break;
case R.styleable.GradientProgressBar_bgColor:
mBgColor = array.getColor(index, Color.BLACK);
break;
case R.styleable.GradientProgressBar_rectRadius:
mRadius = array.getDimensionPixelSize(index, (int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, 10, getResources().getDisplayMetrics()
));
break;
case R.styleable.GradientProgressBar_lineWidth:
mProgressWidth=array.getDimensionPixelSize(index,(int)TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP,200,getResources().getDisplayMetrics()));
break;
case R.styleable.GradientProgressBar_loadSpeed:
mLoadSpeed=array.getInt(index,10);
break;
}
}
array.recycle();
init();
}init()方法做如下操作
private void init(){
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setAntiAlias(true);
mBounds = new Rect();
new Thread(new Runnable() {
@Override
public void run() {
while (mCurrentProgress < mProgressWidth) {
mCurrentProgress = mCurrentProgress + 1;
mContent = Math.round((mCurrentProgress / mProgressWidth) * 100) + "%";
try {
postInvalidate();
Thread.sleep(mLoadSpeed);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}).start();
}3.重寫OnDraw()方法
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
/**
* 設置畫筆的屬性
*/
mPaint.setColor(mBgColor);
mPaint.setStyle(Paint.Style.FILL);
/**
* 繪制背景圓角矩形
*/
canvas.drawRoundRect(0, 0, mProgressWidth, getHeight(), mRadius, mRadius, mPaint);
/**
* 設置線性漸變,設置漸變開始的起點坐標和終點坐標，漸變開始和結束的顏色，設置鏡像
* 對于這個方法不太明白的可以google一下，這里不再詳細說明
*/
LinearGradient gradient = new LinearGradient(0, getHeight() / 2, mProgressWidth, getHeight() / 2,
mStartColor, mEndColor, Shader.TileMode.MIRROR);
mPaint.setShader(gradient);
/**
* 根據進度繪制圓角矩形
*/
canvas.drawRoundRect(0, 0, mCurrentProgress, getHeight(), mRadius, mRadius, mPaint);
mPaint.reset();
mPaint.setAntiAlias(true);
mPaint.setColor(mTextColor);
mPaint.setTextSize(mTextSize);
/**
* 獲取繪制文本所需的矩形大小
*/
mPaint.getTextBounds(mContent, 0, mContent.length(), mBounds);
canvas.drawText(mContent, getWidth() / 2 - mBounds.width() / 2, getHeight() / 2 + mBounds.height() / 2, mPaint);
}好了，這樣就完成了我們水平漸變加載進度條，下面貼出圓形進度條的源碼：
public class RoundProgressBar extends View {
/**
* 自定義變量
*/
private int mTextSize;
private int mTextColor;
private int mCircleWidth;
private int mBgColor;
private int mCurrentColor;
private int mLoadSpeed;
private float mCurrentProgress;
private String mContent = "0%";
private Rect mBounds;
private Paint mPaint;
public RoundProgressBar(Context context) {
this(context, null);
}
public RoundProgressBar(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public RoundProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
TypedArray array = context.getTheme().obtainStyledAttributes(attrs, R.styleable.RoundProgressBar, defStyleAttr, 0);
int count = array.getIndexCount();
for (int i = 0; i < count; i++) {
int index = array.getIndex(i);
switch (index) {
case R.styleable.RoundProgressBar_textSizeRound:
/**
* 默認設置為16sp，TypeValue也可以把sp轉化為px
*/
mTextSize = array.getDimensionPixelSize(index, (int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics()));
break;
case R.styleable.RoundProgressBar_textColorRound:
/**
* 默認設置為黑色
*/
mTextColor = array.getColor(index, Color.BLACK);
break;
case R.styleable.RoundProgressBar_bgColorRound:
mBgColor = array.getColor(index, Color.BLACK);
break;
case R.styleable.RoundProgressBar_circleWidthRound:
mCircleWidth = array.getDimensionPixelSize(index, (int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, 1, getResources().getDisplayMetrics()
));
break;
case R.styleable.RoundProgressBar_currentColorRound:
mCurrentColor = array.getColor(index, Color.BLACK);
break;
case R.styleable.RoundProgressBar_loadSpeedRound:
mLoadSpeed=array.getInt(index,10);
break;
}
}
array.recycle();
init();
}
private void init() {
mBounds = new Rect();
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setAntiAlias(true);
new Thread(new Runnable() {
@Override
public void run() {
while (mCurrentProgress < 360) {
mCurrentProgress = mCurrentProgress + 1;
mContent = Math.round((mCurrentProgress / 360) * 100) + "%";
postInvalidate();
try {
Thread.sleep(mLoadSpeed);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}).start();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
/**
* 設置畫筆的屬性
*/
mPaint.setColor(mBgColor);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeWidth(mCircleWidth);
/**
* 繪制圓環背景
*/
int xPoint = getWidth() / 2;//獲取圓心x的坐標
int radius = xPoint - mCircleWidth;//獲取圓心的半徑
canvas.drawCircle(xPoint, xPoint, radius, mPaint);//用于定義的圓弧的形狀和大小的界限
/**
* 繪制圓環
*/
mPaint.setColor(mCurrentColor);
RectF oval = new RectF(xPoint - radius, xPoint - radius, radius + xPoint, radius + xPoint);
canvas.drawArc(oval, -90, mCurrentProgress, false, mPaint);
/**
* 繪制當前進度文本
*/
mPaint.reset();
mPaint.setAntiAlias(true);
mPaint.setColor(mTextColor);
mPaint.setTextSize(mTextSize);
mPaint.getTextBounds(mContent, 0, mContent.length(), mBounds);
canvas.drawText(mContent, xPoint - mBounds.width() / 2, xPoint + mBounds.height() / 2, mPaint);
}
}4.在xml文件中申明我們的自定義View
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@android:color/white" android:gravity="center_horizontal" android:orientation="vertical"> <com.customeview2.GradientProgressBar android:id="@+id/gradientProgressBar" android:layout_width="300dp" android:layout_height="15dp" android:layout_marginLeft="10dp" android:layout_marginRight="10dp" android:layout_marginTop="200dp" app:bgColor="#C3C3C3" app:endColor="#25B7FA" app:lineWidth="300dp" app:loadSpeed="10" app:rectRadius="20dp" app:startColor="#D2EEFB" app:textColor="@android:color/holo_red_light" app:textSize="12sp" /> <com.customeview2.RoundProgressBar android:id="@+id/roundProgressBar" android:layout_width="60dp" android:layout_height="60dp" android:layout_below="@+id/gradientProgressBar" android:layout_gravity="center" android:layout_marginLeft="10dp" android:layout_marginRight="10dp" android:layout_marginTop="40dp" app:bgColorRound="#C3C3C3" app:circleWidthRound="3dp" app:currentColorRound="#25B7FA" app:loadSpeedRound="10" app:textColor="@android:color/holo_red_light" app:textColorRound="@android:color/holo_red_light" app:textSizeRound="11sp" /> </LinearLayout>
感謝你能夠認真閱讀完這篇文章，希望小編分享Android自定義View如何實現加載進度條效果？內容對大家有幫助，同時也希望大家多多支持億速云，關注億速云行業資訊頻道，遇到問題就找億速云，詳細的解決方法等著你來學習!
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