Android中怎么通过自定义view实现进度条加载效果，针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
分析图:
代码如下:
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安全
数据库
网络和加速
企业服务
package com.example.dotloadview;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.View;
/**
* Created by zhouguizhi on 6/18/15.
*/
public class DotLoadProgressView extends View {
private boolean isStart = false;
private int dotIndex =0;//点下面的角标
private int dotNumber = 0;
private Paint mPaint;
private int paddingTop = 50;
private int paddingBottom = 50;
private int paddingLeft = 30;
private int paddingRight = 30;
private Handler mHandler = new Handler();
private long DELAY_TIME = 300;
private Bitmap bitmap;
private int itemDotSpace = 10;//二个点之间的距离
private Bitmap moveBitmap ;
private Runnable mRunnable = new Runnable() {
@Override
public void run() {
if (dotNumber != 0){
dotIndex = (dotIndex + 1) % dotNumber;
}
invalidate();
mHandler.postDelayed(mRunnable, DELAY_TIME);
}
};
public DotLoadProgressView(Context context, AttributeSet attrs) {
super(context, attrs);
moveBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.active_dot);
init();
}
private void init() {
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setStyle(Paint.Style.FILL);
mPaint.setDither(true);
mPaint.setAntiAlias(true);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
for(int i=0;i<dotNumber;i++){
canvas.drawBitmap(bitmap,paddingLeft+i*itemDotSpace+bitmap.getWidth()*i,paddingTop,mPaint);
}
if(isStart){
canvas.drawBitmap(moveBitmap,paddingLeft+dotIndex*itemDotSpace+moveBitmap.getWidth()*dotIndex,paddingTop,mPaint);
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.inactive_dot);
setMeasuredDimension(parentWidth,bitmap.getHeight()+paddingTop+paddingBottom);
int widthWithoutPadding = parentWidth - paddingLeft - paddingRight;
dotNumber = calculateDotsNumber(widthWithoutPadding);
}
private int calculateDotsNumber(int width) {
int number = (width / (itemDotSpace + bitmap.getWidth()));
return number;
}
public void startProgress() {
isStart = true;
dotIndex = -1;
mHandler.removeCallbacks(mRunnable);
mHandler.post(mRunnable);
}
public void stopProgress() {
isStart = false;
mHandler.removeCallbacks(mRunnable);
invalidate();
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
startProgress();
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
stopProgress();
}
}布局代码:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.example.dotloadview.DotLoadProgressView
android:id="@+id/progress1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</RelativeLayout>关于Android中怎么通过自定义view实现进度条加载效果问题的解答就分享到这里了，希望以上内容可以对大家有一定的帮助，如果你还有很多疑惑没有解开，可以关注亿速云行业资讯频道了解更多相关知识。
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