Android自定义水平渐变进度条 Android自定义水平渐变进度条
hust_twj 人气:0想了解Android自定义水平渐变进度条的相关内容吗,hust_twj在本文为您仔细讲解Android自定义水平渐变进度条的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:Android水平渐变进度条,Android渐变进度条,Android水平进度条,下面大家一起来学习吧。
先看进度条的效果:
具体实现:
新建类,继承自View,在onDraw中进行绘制:
import android.content.Context; import android.graphics.Canvas; import android.graphics.LinearGradient; import android.graphics.Paint; import android.graphics.RectF; import android.graphics.Shader; import android.util.AttributeSet; import android.util.Log; import android.view.View; /** * * 自定义 进度条 * Created by wenjing.tang on 2017/8/7. */ public class CustomizedProgressBar extends View { private float maxCount = 100; //进度条最大值 private float currentCount; //进度条当前值 // private Paint mPaint ; private int mWidth,mHeight; private Context mContext; public CustomizedProgressBar(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initView(context); } public CustomizedProgressBar(Context context, AttributeSet attrs) { super(context, attrs); initView(context); } public CustomizedProgressBar(Context context) { super(context); initView(context); } private void initView(Context context) { mContext=context; } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); Paint mPaint = new Paint(); mPaint.setAntiAlias(true); int round = mHeight/2; //半径 mPaint.setColor(getResources().getColor(R.color.white_alpha)); //设置边框背景颜色 RectF rectBg = new RectF(0, 0, mWidth, mHeight); canvas.drawRoundRect(rectBg, round, round, mPaint);//绘制 最外面的大 圆角矩形,背景为白色 float section = currentCount/maxCount; //进度条的比例 RectF rectProgressBg = new RectF(0, 0, mWidth*section, mHeight); Log.e("CustomizedProgressBar", currentCount+""); Log.e("CustomizedProgressBar", section+""); //Paint设置setColor(白色无透明)和setShader,只让setShader生效;不然前面setColor设置了透明度,透明度会生效,和setShader效果叠加 mPaint.setColor(getResources().getColor(R.color.white)); mPaint.setShader(getLinearGradient()); canvas.drawRoundRect(rectProgressBg, round, round, mPaint); //最左边的圆角矩形 if (maxCount != currentCount){ //如果不是100%,绘制第三段矩形 RectF rectProgressBg2 = new RectF(mWidth*section-round, 0, mWidth*section, mHeight); mPaint.setShader(getLinearGradient()); canvas.drawRect(rectProgressBg2, mPaint); } } private LinearGradient linearGradient; private LinearGradient getLinearGradient(){ if(linearGradient==null){ linearGradient = new LinearGradient(0, 0, getWidth(), mHeight, new int[]{mContext.getResources().getColor(R.color.progress_color_1), mContext.getResources().getColor(R.color.progress_color_2)}, null, Shader.TileMode.CLAMP); //根据R文件中的id获取到color } return linearGradient; } private int dipToPx(int dip) { float scale = getContext().getResources().getDisplayMetrics().density; return (int) (dip * scale + 0.5f * (dip >= 0 ? 1 : -1)); } /*** * 设置最大的进度值 * @param maxCount 最大的进度值 */ public void setMaxCount(float maxCount) { this.maxCount = maxCount; } /*** * 设置当前的进度值 * @param currentCount 当前进度值 */ public void setCurrentCount(float currentCount) { this.currentCount = currentCount > maxCount ? maxCount : currentCount; invalidate(); } public float getMaxCount() { return maxCount; } public float getCurrentCount() { return currentCount; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec); int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec); int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec); int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec); if (widthSpecMode == MeasureSpec.EXACTLY || widthSpecMode == MeasureSpec.AT_MOST) { mWidth = widthSpecSize; } else { mWidth = 0; } if (heightSpecMode == MeasureSpec.AT_MOST || heightSpecMode == MeasureSpec.UNSPECIFIED) { mHeight = dipToPx(18); } else { mHeight = heightSpecSize; } setMeasuredDimension(mWidth, mHeight); } }
其中用到的一些资源文件如下:
<!--自定义进度条背景颜色--> <color name="white_alpha">#0c000000</color> <!--自定义进度条渐变颜色--> <color name="progress_color_1">#ff916b</color> <color name="progress_color_2">#ffa94c</color>
要注意的是,在上面Java代码中,mPaint.setColor(getResources().getColor(R.color.white));这行很重要,因为进度条总共有三层,第一层是最外面的背景,第二层是进度,第三层如果不是100%才绘制,由于第一层背景有透明度,所以setColor设置了透明度,但虽然setShader,透明度还是会生效,两者效果叠加,效果是这样:
加上之后,Paint 第二次设置 setColor (白色无透明)和 setShader,只让 setShader 生效,进度条才会达到满意的效果;
用法:
Java代码中:
customizedProgressBar.setMaxCount(100); integrity = dataCount/TOTAL_COUNT *100; //根据自己情况来初始化完整度 customizedProgressBar.setCurrentCount((int) integrity); mTvtDataIntegrity.setText("完整度" + (int) integrity +"%");
xml文件中(不需要文字显示也可以):
<RelativeLayout android:layout_width="match_parent" android:layout_height="18dp" android:layout_marginStart="66dp" android:layout_marginEnd="66dp" android:layout_centerVertical="true"> <com.text.widget.CustomizedProgressBar android:id="@+id/progress" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_centerInParent="true"/> <TextView android:id="@+id/tv_data_integrity" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" tools:text="完整度35%" android:textSize="10sp" android:layout_centerInParent="true"/> </RelativeLayout>
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