Android之加载图片时自定义进度条
Android之加载图片时自定义进度条
也许我们在Android开发时有这样一个需求,在请求网络图片时,如果在图片还未完全显示完全时,显示一个比较漂亮简洁的进度条,是不是会显得很人性化呢?比如像下图所示:
下面我们就来实现一下这样一个进度条:主要代码先贴上,LoadingCircleView
- /**
- * 圆形加载进度条
- *
- * @author way
- *
- */
- publicclass LoadingCircleView extends View {
- privatefinal Paint paint;
- privatefinal Context context;
- private Resources res;
- privateint max = 100;
- privateint progress = 0;
- privateint ringWidth;
- // 圆环的颜色
- privateint ringColor;
- // 进度条颜色
- privateint progressColor;
- // 字体颜色
- privateint textColor;
- // 字的大小
- privateint textSize;
- private String textProgress;
- public LoadingCircleView(Context context, AttributeSet attrs, int defStyle) {
- super(context, attrs, defStyle);
- this.context = context;
- this.paint = new Paint();
- this.res = context.getResources();
- this.paint.setAntiAlias(true); // 消除锯齿
- this.ringWidth = dip2px(context, 3); // 设置圆环宽度
- this.ringColor = Color.BLACK;// 黑色进度条背景
- this.progressColor = Color.WHITE;// 白色进度条
- this.textColor = Color.BLACK;// 黑色数字显示进度;
- this.textSize = 15;// 默认字体大小
- }
- public LoadingCircleView(Context context, AttributeSet attrs) {
- this(context, attrs, 0);
- }
- public LoadingCircleView(Context context) {
- this(context, null);
- }
- /**
- * 设置进度条最大值
- *
- * @param max
- */
- publicsynchronizedvoid setMax(int max) {
- if (max < 0)
- max = 0;
- if (progress > max)
- progress = max;
- this.max = max;
- }
- /**
- * 获取进度条最大值
- *
- * @return
- */
- publicsynchronizedint getMax() {
- return max;
- }
- /**
- * 设置加载进度,取值范围在0~之间
- *
- * @param progress
- */
- publicsynchronizedvoid setProgress(int progress) {
- if (progress >= 0 && progress <= max) {
- this.progress = progress;
- invalidate();
- }
- }
- /**
- * 获取当前进度值
- *
- * @return
- */
- publicsynchronizedint getProgress() {
- return progress;
- }
- /**
- * 设置圆环背景色
- *
- * @param ringColor
- */
- publicvoid setRingColor(int ringColor) {
- this.ringColor = res.getColor(ringColor);
- }
- /**
- * 设置进度条颜色
- *
- * @param progressColor
- */
- publicvoid setProgressColor(int progressColor) {
- this.progressColor = res.getColor(progressColor);
- }
- /**
- * 设置字体颜色
- *
- * @param textColor
- */
- publicvoid setTextColor(int textColor) {
- this.textColor = res.getColor(textColor);
- }
- /**
- * 设置字体大小
- *
- * @param textSize
- */
- publicvoid setTextSize(int textSize) {
- this.textSize = textSize;
- }
- /**
- * 设置圆环半径
- *
- * @param ringWidth
- */
- publicvoid setRingWidthDip(int ringWidth) {
- this.ringWidth = dip2px(context, ringWidth);
- }
- /**
- * 通过不断画弧的方式更新界面,实现进度增加
- */
- @Override
- protectedvoid onDraw(Canvas canvas) {
- int center = getWidth() / 2;
- int radios = center - ringWidth / 2;
- // 绘制圆环
- this.paint.setStyle(Paint.Style.STROKE); // 绘制空心圆
- this.paint.setColor(ringColor);
- this.paint.setStrokeWidth(ringWidth);
- canvas.drawCircle(center, center, radios, this.paint);
- RectF oval = new RectF(center - radios, center - radios, center
- + radios, center + radios);
- this.paint.setColor(progressColor);
- canvas.drawArc(oval, 90, 360 * progress / max, false, paint);
- this.paint.setStyle(Paint.Style.FILL);
- this.paint.setColor(textColor);
- this.paint.setStrokeWidth(0);
- this.paint.setTextSize(textSize);
- this.paint.setTypeface(Typeface.DEFAULT_BOLD);
- textProgress = (int) (1000 * (progress / (10.0 * max))) + "%";
- float textWidth = paint.measureText(textProgress);
- canvas.drawText(textProgress, center - textWidth / 2, center + textSize
- / 2, paint);
- super.onDraw(canvas);
- }
- /**
- * 根据手机的分辨率从 dp 的单位 转成为 px(像素)
- */
- publicstaticint dip2px(Context context, float dpValue) {
- finalfloat scale = context.getResources().getDisplayMetrics().density;
- return (int) (dpValue * scale + 0.5f);
- }
- }
其他的,我就不多说了,跟正常ProgressBar用法类似了,有需要的可以下载源码试试效果:
免费下载地址在 http://linux.bkjia.com/
用户名与密码都是www.bkjia.com
具体下载目录在 /2013年资料/5月/14日/Android之加载图片时自定义进度条
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