【移動應用開發(fā)技術】Android如何實現(xiàn)帶進度條的WebView

【移動應用開發(fā)技術】Android如何實現(xiàn)帶進度條的WebView

這篇文章將為大家詳細講解有關Android如何實現(xiàn)帶進度條的WebView，在下覺得挺實用的，因此分享給大家做個參考，希望大家閱讀完這篇文章后可以有所收獲。Android實現(xiàn)帶進度條的WebView的實例1.WebView加載網頁方法//加載本地資源

loadUrl("file:///android_asset/example.html");

//加載網絡資源

loadUrl("");2.帶進度的Drawable文件view_progress_webview<?xml

version="1.0"

encoding="utf-8"?>

<layer-list

xmlns:android="/apk/res/android">

<item

android:id="@android:id/progress">

<clip>

<shape>

<solid

android:color="#31CE15"/>

<corners

android:radius="2dp"/>

</shape>

</clip>

</item>

</layer-list>顏色值為進度顏色，根據(jù)需要更換3.ProgressWebView類/**

*

帶進度條的WebView

*

@Author

GQ

*/

public

class

ProgressWebView

extends

WebView

{

private

ProgressBar

progressbar;

private

Context

mContext;

public

ProgressWebView(Context

context,

AttributeSet

attrs)

{

super(context,

attrs);

this.mContext

=

context;

progressbar

=

new

ProgressBar(context,

null,

android.R.gressBarStyleHorizontal);

progressbar.setLayoutParams(new

LayoutParams(LayoutParams.FILL_PARENT,

5,

0,

0));

Drawable

drawable

=

context.getResources().getDrawable(R.drawable.view_progress_webview);

progressbar.setProgressDrawable(drawable);

addView(progressbar);

//主要處理解析，渲染網頁等瀏覽器做的事情

setWebViewClient(new

WebViewClient()

{

@Override

public

void

onReceivedError(WebView

view,

int

errorCode,

String

description,

String

failingUrl)

{

super.onReceivedError(view,

errorCode,

description,

failingUrl);

//加載失敗時候,顯示自定義的頁面

if

(errorListener

!=

null)

{

errorListener.onError();

}

}

});

//輔助WebView處理Javascript的對話框，網站圖標，網站title，加載進度等

setWebChromeClient(new

WebChromeClient());

getSettings().setSupportZoom(true);//是否可以縮放

getSettings().setBuiltInZoomControls(true);

getSettings().setJavaScriptEnabled(true);//支持JS

getSettings().setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS);

getSettings().setUseWideViewPort(true);

getSettings().setLoadWithOverviewMode(true);

getSettings().setSaveFormData(true);

getSettings().setDomStorageEnabled(true);

//優(yōu)先使用緩存

getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);

//禁用長按

setOnLongClickListener(new

OnLongClickListener()

{

@Override

public

boolean

onLongClick(View

view)

{

return

true;

}

});

//如果在瀏覽器下載,調用瀏覽器默認下載+通知欄

setDownloadListener(new

DownloadListener()

{

@Override

public

void

onDownloadStart(String

url,

String

userAgent,

String

contentDisposition,

String

mimetype,

long

contentLength)

{

Uri

uri

=

Uri.parse(url);

Intent

intent

=

new

Intent(Intent.ACTION_VIEW,

uri);

mContext.startActivity(intent);

}

});

}

public

class

WebChromeClient

extends

android.webkit.WebChromeClient

{

@Override

public

void

onProgressChanged(WebView

view,

int

newProgress)

{

if

(newProgress

==

100)

{

progressbar.setVisibility(GONE);

}

else

{

if

(progressbar.getVisibility()

==

GONE)

progressbar.setVisibility(VISIBLE);

progressbar.setProgress(newProgress);

}

super.onProgressChanged(view,

newProgress);

}

@Override

public

void

onReceivedTitle(WebView

view,

String

title)

{

super.onReceivedTitle(view,

title);

if

(titleListener

!=

null)

titleListener.getTitle(title);

}

}

@Override

protected

void

onScrollChanged(int

l,

int

t,

int

oldl,

int

oldt)

{

LayoutParams

lp

=

(LayoutParams)

progressbar.getLayoutParams();

lp.x

=

l;

lp.y

=

t;

progressbar.setLayoutParams(lp);

super.onScrollChanged(l,

t,

oldl,

oldt);

}

private

TitleListener

titleListener;

public

interface

TitleListener

{

void

getTitle(String

title);

}

public

void

setOnTitleListener(TitleListener

titleListener)

{

this.titleListener

=

titleListener;

}

private

ErrorListener

errorListener;

public

interface

ErrorListener

{

void

onError();

}

public

void

setOnErrorListener(ErrorListener

errorListener)

{

this.errorListener

=

errorListener;

}

}4.使用/**

*

公共WebView

*/

public

class

BasicWebActivity

extends

Activity

{

protected

ProgressWebView

progressWebView;

private

TextView

title;//標題欄

private

TextView

tv_none;//加載失敗顯示文字

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.mon_webview);

title

=

(TextView)

findViewById(R.id.title);

tv_none

=

(TextView)

findViewById(R.id.tv_none);

progressWebView

=

(ProgressWebView)

findViewById(R.gressWebView);

String

url

=

getIntent().getStringExtra("url");

progressWebView.setOnTitleListener(new

ProgressWebView.TitleListener()

{

@Override

public

void

getTitle(String

title)

{

title.setText(title);

}

});

progressWebView.setOnErrorListener(new

ProgressWebView.ErrorListener()

{

@Override

public

void

onError()

{

tv_none.setText("url資源失效");

}

});

//加載網頁

progressWebView.loadUrl(url);

}

//重寫返回鍵

@Override

public

boolean

onKeyDown(int

keyCode,

KeyEvent

event)

{

if

(keyCode

==

KeyEvent.KEYCODE_BACK)

{

if

(progressWebView.canGoBack())

{

progressWebView.goBack();//返回上一層頁面

return

true;

}

else

{

finish();//關閉頁面