android滚动视图实例,android实现自定义滚动条

【实例简介】

【实例截图】

【核心代码】

package com.test;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Rect;

import android.util.AttributeSet;

import android.widget.ProgressBar;

public class MyProgress extends ProgressBar {

private String text;

private Paint mPaint;

private static final int TEXT_SIZE=25;

public MyProgress(Context context) {

super(context);

initText();

}

public MyProgress(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

initText();

}

public MyProgress(Context context, AttributeSet attrs) {

super(context, attrs);

initText();

}

@Override

public synchronized void setProgress(int progress) {

setText(progress);

super.setProgress(progress);

}

@Override

protected synchronized void onDraw(Canvas canvas) {

super.onDraw(canvas);

Rect rect = new Rect();

this.mPaint.getTextBounds(this.text, 0, this.text.length(), rect);

int x = (getWidth() / 2) - rect.centerX();

int y = (getHeight() / 2) - rect.centerY();

canvas.drawText(this.text, x, y, this.mPaint);

}

// 初始化，画笔

private void initText() {

this.mPaint = new Paint();

this.mPaint.setAntiAlias(true);

this.mPaint.setColor(Color.WHITE);

this.mPaint.setTextSize(TEXT_SIZE);

}

@SuppressWarnings("unused")

private void setText() {

setText(this.getProgress());

}

// 设置文字内容

private void setText(int progress) {

int i = (progress * 100) / this.getMax();

this.text = String.valueOf(i) "%";

}

}