我的代码下载加载网址页面,搜索歌曲后,我点击下载链接崩溃.没有太多关于如何让下载管理器使用Webview的教程.我究竟做错了什么？
import java.io.File;
import android.app.Activity;
import android.app.DownloadManager;
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class List1 extends Activity {
WebView ourBrow;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Use a custom layout file
setContentView(R.layout.list1);
final DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
final File destinationDir = new File (Environment.getExternalStorageDirectory(),getPackageName());
if (!destinationDir.exists()) {
destinationDir.mkdir(); // Don't forget to make the directory if it's not there
}
ourBrow = (WebView) findViewById(R.id.wvBrowser);
ourBrow.getSettings().setJavaScriptEnabled(true);
ourBrow.setInitialScale(50);
ourBrow.getSettings().setUseWideViewPort(true);
ourBrow.setVerticalScrollBarEnabled(false);
ourBrow.setHorizontalScrollBarEnabled(false);
ourBrow.loadUrl("http://www.degjo.com");
ourBrow.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading (WebView view,String url) {
boolean shouldOverride = false;
// We only want to handle requests for mp3 files,everything else the webview
// can handle normally
if (url.endsWith(".mp3")) {
shouldOverride = true;
Uri source = Uri.parse(url);
// Make a new request pointing to the mp3 url
DownloadManager.Request request = new DownloadManager.Request(source);
// Use the same file name for the destination
File destinationFile = new File (destinationDir,source.getLastPathSegment());
request.setDestinationUri(Uri.fromFile(destinationFile));
// Add it to the manager
manager.enqueue(request);
}
return shouldOverride;
}
});
}
}
logcat的
02-18 19:45:44.891: E/AndroidRuntime(357): at android.content.ContentProviderProxy.insert(ContentProviderNative.java:408) 02-18 19:45:44.891: E/AndroidRuntime(357): at android.content.ContentResolver.insert(ContentResolver.java:604) 02-18 19:45:44.891: E/AndroidRuntime(357): at android.app.DownloadManager.enqueue(DownloadManager.java:750) 02-18 19:45:44.891: E/AndroidRuntime(357): at com.example.androidbuttonsactivities.List1$1.shouldOverrideUrlLoading(List1.java:78) 02-18 19:45:44.891: E/AndroidRuntime(357): at android.webkit.CallbackProxy.uiOverrideUrlLoading(CallbackProxy.java:216) 02-18 19:45:44.891: E/AndroidRuntime(357): at android.webkit.CallbackProxy.handleMessage(CallbackProxy.java:323) 02-18 19:45:44.891: E/AndroidRuntime(357): at android.os.Handler.dispatchMessage(Handler.java:99) 02-18 19:45:44.891: E/AndroidRuntime(357): at android.os.Looper.loop(Looper.java:123) 02-18 19:45:44.891: E/AndroidRuntime(357): at android.app.ActivityThread.main(ActivityThread.java:3683) 02-18 19:45:44.891: E/AndroidRuntime(357): at java.lang.reflect.Method.invokeNative(Native Method) 02-18 19:45:44.891: E/AndroidRuntime(357): at java.lang.reflect.Method.invoke(Method.java:507) 02-18 19:45:44.891: E/AndroidRuntime(357): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 02-18 19:45:44.891: E/AndroidRuntime(357): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 02-18 19:45:44.891: E/AndroidRuntime(357): at dalvik.system.NativeStart.main(Native Method) 02-18 19:45:48.401: I/Process(357): Sending signal. PID: 357 SIG: 9
解决方法
这可能取决于Android版本的版本问题,下面的代码将会在2.3版本上成功运行,检查一下,
ourBrow.setWebViewClient(new WebViewClient() {
@Override
public void onReceivedError(WebView view,int errorCode,String description,String failingUrl) {
Log.d("WEB_VIEW_TEST","error code:" + errorCode + " - " + description);
}
@Override
public boolean shouldOverrideUrlLoading(WebView view,String url) {
// handle different requests for different type of files
// this example handles downloads requests for .apk and .mp3 files
// everything else the webview can handle normally
if (url.endsWith(".apk")) {
Uri source = Uri.parse(url);
// Make a new request pointing to the .apk url
DownloadManager.Request request = new DownloadManager.Request(source);
// appears the same in Notification bar while downloading
request.setDescription("Description for the DownloadManager Bar");
request.setTitle("YourApp.apk");
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
}
// save the file in the "Downloads" folder of SDCARD
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,"SmartPigs.apk");
// get download service and enqueue file
DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
manager.enqueue(request);
}
else if(url.endsWith(".mp3")) {
// if the link points to an .mp3 resource do something else
}
// if there is a link to anything else than .apk or .mp3 load the URL in the webview
else view.loadUrl(url);
return true;
}
});
