在我的网络视图中，我加载了一个 URL，该 URL 具有电视频道直播的嵌入式视频播放器。它在除 ICS(4) 之外的所有 Android 操作系统版本中都能正常工作。第一次它可以很好地播放视频，但是当我返回并再次进入包含视频的页面时，视频不会加载并显示空白页。如果我从应用程序设置中强制停止应用程序并再次启动应用程序然后它运行良好然后像往常一样再次出现白屏，我已经实施了很多策略，这是最新的，我完全被困在这里：
public class Livetvwebview extends Activity {
RelativeLayout a;
WebView webtv;
String url;
VideoView video;
WChromeClient chromeClient;
WebViewClient wvClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
// requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().requestFeature(Window.FEATURE_PROGRESS);
setContentView(R.layout.livewebview);
Toast.makeText(getApplicationContext(),
"Channel is loading..This may take upto a minute",
Toast.LENGTH_LONG).show();
url = getIntent().getStringExtra("tvchannel");
Log.i("TVURL", url);
webtv = (WebView) findViewById(R.id.webViewlive);
webtv.clearCache(true);
webtv.loadUrl(url);
webtv.getSettings().setLoadWithOverviewMode(true);
webtv.getSettings().setUseWideViewPort(true);
webtv.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
webtv.setWebChromeClient(new WChromeClient());
webtv.setWebViewClient(new myWebClient());
webtv.getSettings().setJavaScriptEnabled(true);
webtv.getSettings().setPluginState(PluginState.ON);
webtv.getSettings().setDomStorageEnabled(true);
}
public class myWebClient extends WebViewClient {
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
// TODO Auto-generated method stub
super.onPageStarted(view, url, favicon);
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// TODO Auto-generated method stub
view.loadUrl(url);
return true;
}
@Override
public void onPageFinished(WebView view, String url) {
// TODO Auto-generated method stub
super.onPageFinished(view, url);
}
}
@SuppressLint("NewApi")
@Override
protected void onPause() {
// TODO Auto-generated method stub
WebSettings webSettings = webtv.getSettings();
webSettings.setCacheMode(WebSettings.LOAD_NO_CACHE);
webtv.onPause();
this.finish();
super.onPause();
}
@SuppressLint("NewApi")
@Override
protected void onResume() {
webtv.onResume();
super.onResume();
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
// android.os.Process.killProcess(android.os.Process.myPid());
Editor editor = getSharedPreferences("clear_cache",
Context.MODE_PRIVATE).edit();
editor.clear();
editor.commit();
trimCache(this);
super.onDestroy();
}
class WChromeClient extends WebChromeClient {
@Override
public void onProgressChanged(WebView view, int progress) {
Log.i("Method", "Onrogresschanged");
Livetvwebview.this.setTitle("Loading...");
Livetvwebview.this.setProgress(progress * 100);
if (progress == 100)
Livetvwebview.this.setTitle("LiveTv");
}
@Override
public void onShowCustomView(View view, CustomViewCallback callback) {
// TODO Auto-generated method stub
super.onShowCustomView(view, callback);
if (view instanceof FrameLayout) {
FrameLayout frame = (FrameLayout) view;
if (frame.getFocusedChild() instanceof VideoView) {
webtv.setVisibility(View.GONE);
video = (VideoView) frame.getFocusedChild();
FrameLayout.LayoutParams par = new FrameLayout.LayoutParams(
LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT);
par.gravity = Gravity.CENTER_HORIZONTAL;
video.setLayoutParams(par);
frame.removeView(video);
a.addView(video);
video.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
Toast.makeText(Livetvwebview.this,
"Video completed", Toast.LENGTH_LONG)
.show();
}
});
video.setOnErrorListener(new OnErrorListener() {
@Override
public boolean onError(MediaPlayer mp, int what,
int extra) {
Toast.makeText(Livetvwebview.this,
"Encountered some error", Toast.LENGTH_LONG)
.show();
return true;
}
});
video.start();
}
}
}
}
public static void trimCache(Context context) {
try {
File dir = context.getCacheDir();
if (dir != null && dir.isDirectory()) {
deleteDir(dir);
}
} catch (Exception e) {
// TODO: handle exception
}
}
public static boolean deleteDir(File dir) {
if (dir != null && dir.isDirectory()) {
String[] children = dir.list();
for (int i = 0; i < children.length; i++) {
boolean success = deleteDir(new File(dir, children[i]));
if (!success) {
return false;
}
}
}
return dir.delete();
}
}
任何人都可以帮助我吗？