安卓如何實現上傳進度條

❶ android 進度條，暫停，繼續怎麼弄

Handler和ProgressBar實現進度條的開始，暫停，停止，後退和循環
一，涉及的handler類方法
1，
post(Runnable r)
Causes the Runnable r to be added to the message queue.將要執行的線程對象加到隊列當中
2，
removeCallbacks(Runnable r)
Remove any pending posts of Runnable r that are in the message queue.移除隊列當中未執行的線程對象
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.
將要執行的線程對象放入到隊列當中，待時間結束後，運行制定的線程對象

二，編寫程序

程序效果：實現進度條的開始，暫停，停止，後退和循環
http://blog.csdn.net/superjunjin/article/details/7539844

❷ android中webview 怎麼實現網頁載入時顯示載入進度

android中只需要給webView注冊一個事件即可實現載入進度。
以下是具體實現代碼：
1.從webView中獲取設置
WebSettings sws = webView.getSettings();
sws.setSupportZoom(true);
sws.setBuiltInZoomControls(true);
webView.setInitialScale(25);
webView.getSettings().setUseWideViewPort(true);

2.注冊setWebChromeClient事件
webView.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
// Activity和Webview根據載入程度決定進度條的進度大小
// 當載入到100%的時候 進度條自動消失
//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中處理進度，progress就是進度值。

❸ android 繪制進度條

看起來代碼挺長，其實都是在獲取自定義屬性，沒什麼技術含量。
寬度不變，所以的自定義屬性不涉及寬度，高度呢，只考慮不是EXACTLY的情況（用戶明確指定了，就不管了），根據padding和進度條寬度算出自己想要的，如果非EXACTLY下，進行exceptHeight封裝，傳入給控制項進行測量高度。

橫向的滾動條繪制肯定需要一些屬性，比如已/未到達進度的顏色、寬度，文本的顏色、大小等。
本來呢，我是想通過系統ProgressBar的progressDrawable，從裡面提取一些屬性完成繪制需要的參數的。但是，最終呢，反而讓代碼變得復雜。所以最終還是改用自定義屬性。 說道自定義屬性，大家應該已經不陌生了。

1、
1、自定義屬性
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、構造中獲取

[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
剛才不是出onDraw裡面寫寫就行了么，為什麼要改onMeasure呢，主要是因為我們所有的屬性比如進度條寬度讓用戶自定義了，所以我們的測量也得稍微變下。

[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);

}

測量完，就到我們的onDraw了~~~