[英]Show a progressbar on top while loading webview app
我正在嘗試在應用程序的頂部顯示進度條,例如android的google chrome加載網站時顯示加載條。
當用戶單擊Webview應用程序的任何內部鏈接時,我想顯示此進度欄...就像谷歌瀏覽器一樣。
這是我嘗試過的方法,此代碼不起作用,即使它沒有啟動,應用程序也會停止工作。
public class MainActivity extends AppCompatActivity {
private WebView mWebView;
private ProgressBar progressBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setBackgroundDrawable(null);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
progressBar.setMax(100);
setContentView(R.layout.activity_main);
mWebView = (WebView) findViewById(R.id.main_webview);
mWebView.setWebViewClient(new WebViewClient() {
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
progressBar.setVisibility(View.VISIBLE);
progressBar.setProgress(0);
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
progressBar.setVisibility(View.GONE);
progressBar.setProgress(100);
if (mWebView.getProgress() == 100) {
// show webview
mWebView.setVisibility(View.VISIBLE);
// hide splash
findViewById(R.id.splash_screen).setVisibility(View.GONE);
}
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (Uri.parse(url).getHost().contains("www.example.com")) {
return false;
}
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
view.getContext().startActivity(intent);
return true;
}
public void onReceivedError(WebView view, int errorCode,
String description, String failingUrl) {
view.loadUrl("file:///android_asset/offline.html");
}
});
mWebView.loadUrl("http://www.example.com/?m=1");
}
}
主要活動:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<ImageView
android:id="@+id/splash_screen"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:src="@mipmap/splash_logo"
android:visibility="visible" />
<WebView
android:id="@+id/main_webview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="gone" />
<ProgressBar
android:id="@+id/progressBar"
android:minHeight="2dip"
android:maxHeight="2dip"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
style="@android:style/Widget.ProgressBar.Horizontal" />
</RelativeLayout>
您創建MyWebChromeClient
public class MyWebChromeClient extends WebChromeClient {
private ProgressListener mListener;
public MyWebChromeClient(ProgressListener listener) {
mListener = listener;
}
@Override
public void onProgressChanged(WebView view, int newProgress) {
mListener.onUpdateProgress(newProgress);
super.onProgressChanged(view, newProgress);
}
public interface ProgressListener {
public void onUpdateProgress(int progressValue);
}
}
在您的MainActivity中
public class MainActivity extends AppCompatActivity implements MyWebChromeClient.ProgressListener{
private WebView mWebView;
private ProgressBar mProgressBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mWebView = (WebView) findViewById(R.id.webView);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
// add progress bar
mProgressBar = (ProgressBar) findViewById(R.id.progressBar);
mWebView.setWebChromeClient(new MyWebChromeClient(this));
mWebView.setWebViewClient(new WebViewClient() {
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
mProgressBar.setVisibility(View.VISIBLE);
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
mProgressBar.setVisibility(View.GONE);
}
});
}
@Override
public void onUpdateProgress(int progressValue) {
mProgressBar.setProgress(progressValue);
if (progressValue == 100) {
mProgressBar.setVisibility(View.INVISIBLE);
}
}
}
在activity_main.xml中
<RelativeLayout
android:id="@+id/relative_web_view"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ProgressBar
android:id="@+id/progressBar"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="fill_parent"
android:layout_height="@dimen/progress_bar_height"
android:progressDrawable="@drawable/bg_progress_bar_webview" />
<WebView
android:id="@+id/webView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/progressBar" />
</RelativeLayout>
在可繪制中創建bg_progress_bar_webview.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:id="@android:id/background"
android:drawable="@android:color/transparent"/>
<item android:id="@android:id/secondaryProgress">
<scale
android:drawable="@color/progress_bar_second"
android:scaleWidth="100%" />
</item>
<item android:id="@android:id/progress">
<scale
android:drawable="@color/progress_bar_runing"
android:scaleWidth="100%" />
</item>
</layer-list>
希望對您有幫助
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.