安卓如何实现上传进度条

❶ android 进度条，暂停，继续怎么弄

Handler和ProgressBar实现进度条的开始，暂停，停止，后退和循环
一，涉及的handler类方法
1，
post(Runnable r)
Causes the Runnable r to be added to the message queue.将要执行的线程对象加到队列当中
2，
removeCallbacks(Runnable r)
Remove any pending posts of Runnable r that are in the message queue.移除队列当中未执行的线程对象
3，
postDelayed(Runnable r, long delayMillis)
Causes the Runnable r to be added to the message queue, to be run after the specified amount of time elapses.
将要执行的线程对象放入到队列当中，待时间结束后，运行制定的线程对象

二，编写程序

程序效果：实现进度条的开始，暂停，停止，后退和循环
http://blog.csdn.net/superjunjin/article/details/7539844

❷ android中webview 怎么实现网页加载时显示加载进度

android中只需要给webView注册一个事件即可实现加载进度。
以下是具体实现代码：
1.从webView中获取设置
WebSettings sws = webView.getSettings();
sws.setSupportZoom(true);
sws.setBuiltInZoomControls(true);
webView.setInitialScale(25);
webView.getSettings().setUseWideViewPort(true);

2.注册setWebChromeClient事件
webView.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
// Activity和Webview根据加载程度决定进度条的进度大小
// 当加载到100%的时候 进度条自动消失
//WebViewProgressActivity.this.setTitle("Loading...");
//WebViewProgressActivity.this.setProgress(progress * 100);
if (progress == 100) {
progressBar.setVisibility(View.GONE);
//WebViewProgressActivity.this.setTitle("完成");
}
}
});

3.注意在onProgressChanged中处理进度，progress就是进度值。

❸ android 绘制进度条

看起来代码挺长，其实都是在获取自定义属性，没什么技术含量。
宽度不变，所以的自定义属性不涉及宽度，高度呢，只考虑不是EXACTLY的情况（用户明确指定了，就不管了），根据padding和进度条宽度算出自己想要的，如果非EXACTLY下，进行exceptHeight封装，传入给控件进行测量高度。

横向的滚动条绘制肯定需要一些属性，比如已/未到达进度的颜色、宽度，文本的颜色、大小等。
本来呢，我是想通过系统ProgressBar的progressDrawable，从里面提取一些属性完成绘制需要的参数的。但是，最终呢，反而让代码变得复杂。所以最终还是改用自定义属性。 说道自定义属性，大家应该已经不陌生了。

1、
1、自定义属性
values/attr_progress_bar.xml:

[html] view plain
<?xml version="1.0" encoding="utf-8"?>
<resources>

<declare-styleable name="">
<attr name="progress_unreached_color" format="color" />
<attr name="progress_reached_color" format="color" />
<attr name="progress_reached_bar_height" format="dimension" />
<attr name="progress_unreached_bar_height" format="dimension" />
<attr name="progress_text_size" format="dimension" />
<attr name="progress_text_color" format="color" />
<attr name="progress_text_offset" format="dimension" />
<attr name="progress_text_visibility" format="enum">
<enum name="visible" value="0" />
<enum name="invisible" value="1" />
</attr>
</declare-styleable>

<declare-styleable name="RoundProgressBarWidthNumber">
<attr name="radius" format="dimension" />
</declare-styleable>

</resources>
2、构造中获取

[java] view plain
public class extends ProgressBar
{

private static final int DEFAULT_TEXT_SIZE = 10;
private static final int DEFAULT_TEXT_COLOR = 0XFFFC00D1;
private static final int DEFAULT_COLOR_UNREACHED_COLOR = 0xFFd3d6da;
private static final int DEFAULT_HEIGHT_REACHED_PROGRESS_BAR = 2;
private static final int DEFAULT_HEIGHT_UNREACHED_PROGRESS_BAR = 2;
private static final int DEFAULT_SIZE_TEXT_OFFSET = 10;

/**
* painter of all drawing things
*/
protected Paint mPaint = new Paint();
/**
* color of progress number
*/
protected int mTextColor = DEFAULT_TEXT_COLOR;
/**
* size of text (sp)
*/
protected int mTextSize = sp2px(DEFAULT_TEXT_SIZE);

/**
* offset of draw progress
*/
protected int mTextOffset = dp2px(DEFAULT_SIZE_TEXT_OFFSET);

/**
* height of reached progress bar
*/
protected int mReachedProgressBarHeight = dp2px(DEFAULT_HEIGHT_REACHED_PROGRESS_BAR);

/**
* color of reached bar
*/
protected int mReachedBarColor = DEFAULT_TEXT_COLOR;
/**
* color of unreached bar
*/
protected int mUnReachedBarColor = DEFAULT_COLOR_UNREACHED_COLOR;
/**
* height of unreached progress bar
*/
protected int mUnReachedProgressBarHeight = dp2px(DEFAULT_HEIGHT_UNREACHED_PROGRESS_BAR);
/**
* view width except padding
*/
protected int mRealWidth;

protected boolean mIfDrawText = true;

protected static final int VISIBLE = 0;

public (Context context, AttributeSet attrs)
{
this(context, attrs, 0);
}

public (Context context, AttributeSet attrs,
int defStyle)
{
super(context, attrs, defStyle);

setHorizontalScrollBarEnabled(true);

obtainStyledAttributes(attrs);

mPaint.setTextSize(mTextSize);
mPaint.setColor(mTextColor);

}

/**
* get the styled attributes
*
* @param attrs
*/
private void obtainStyledAttributes(AttributeSet attrs)
{
// init values from custom attributes
final TypedArray attributes = getContext().obtainStyledAttributes(
attrs, R.styleable.);

mTextColor = attributes
.getColor(
R.styleable._progress_text_color,
DEFAULT_TEXT_COLOR);
mTextSize = (int) attributes.getDimension(
R.styleable._progress_text_size,
mTextSize);

mReachedBarColor = attributes
.getColor(
R.styleable._progress_reached_color,
mTextColor);
mUnReachedBarColor = attributes
.getColor(
R.styleable._progress_unreached_color,
DEFAULT_COLOR_UNREACHED_COLOR);
mReachedProgressBarHeight = (int) attributes
.getDimension(
R.styleable._progress_reached_bar_height,
mReachedProgressBarHeight);
mUnReachedProgressBarHeight = (int) attributes
.getDimension(
R.styleable._progress_unreached_bar_height,
mUnReachedProgressBarHeight);
mTextOffset = (int) attributes
.getDimension(
R.styleable._progress_text_offset,
mTextOffset);

int textVisible = attributes
.getInt(R.styleable._progress_text_visibility,
VISIBLE);
if (textVisible != VISIBLE)
{
mIfDrawText = false;
}
attributes.recycle();
}

3、onMeasure
刚才不是出onDraw里面写写就行了么，为什么要改onMeasure呢，主要是因为我们所有的属性比如进度条宽度让用户自定义了，所以我们的测量也得稍微变下。

[java] view plain
@Override
protected synchronized void onMeasure(int widthMeasureSpec,
int heightMeasureSpec)
{
int heightMode = MeasureSpec.getMode(heightMeasureSpec);

if (heightMode != MeasureSpec.EXACTLY)
{

float textHeight = (mPaint.descent() + mPaint.ascent());
int exceptHeight = (int) (getPaddingTop() + getPaddingBottom() + Math
.max(Math.max(mReachedProgressBarHeight,
mUnReachedProgressBarHeight), Math.abs(textHeight)));

heightMeasureSpec = MeasureSpec.makeMeasureSpec(exceptHeight,
MeasureSpec.EXACTLY);
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);

}

测量完，就到我们的onDraw了~~~