我在Android Studio中将网站转换为使用WebView的应用程序。一切都很好，但我网站上的youtube视频没有全屏显示。我是初学者，所以请帮助我解决这个问题。
Main Activity Code ---
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.view.KeyEvent;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.FrameLayout;
import java.net.URI;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
//initializing WebView
private WebView mwebView;
private FrameLayout customViewContainer;
private WebChromeClient.CustomViewCallback customViewCallback;
private View mCustomView;
private MyWebviewClient mWebChromeClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
//WebView
mwebView = (WebView) findViewById(R.id.myWebView);
WebSettings webSettings = mwebView.getSettings();
webSettings.setJavaScriptEnabled(true);
//improve webView performance
mwebView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
mwebView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
mwebView.getSettings().setAppCacheEnabled(true);
mwebView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
mwebView.setWebChromeClient(new MyChromeBrowser());
webSettings.setDomStorageEnabled(true);
webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS);
webSettings.setUseWideViewPort(true);
webSettings.setSavePassword(true);
webSettings.setSaveFormData(true);
webSettings.setEnableSmoothTransition(true);
mWebChromeClient = new myWebChromeClient();
webView.setWebChromeClient(mWebChromeClient);
mwebView.loadUrl("https://laughonlyblog.wordpress.com");
//force links open in webview only
}
private class MyChromeBrowser extends WebChromeClient {
@Override
public void onShowCustomView(View view, CustomViewCallback callback) {
super.onShowCustomView(view, callback);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
}
@Override
public void onHideCustomView() {
super.onHideCustomView();
}
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
// Handle the camera action
mwebView.loadUrl("http://www.newsweek.com/us");
} else if (id == R.id.nav_slideshow) {
mwebView.loadUrl("http://www.newsweek.com/world");
} else if (id == R.id.nav_manage) {
mwebView.loadUrl("http://www.newsweek.com/tech-science");
} else if (id == R.id.nav_gallery) {
mwebView.loadUrl("http://www.newsweek.com/sports");
} else if (id == R.id.nav_share) {
mwebView.loadUrl("http://www.newsweek.com/about-newsweek");
} else if (id == R.id.nav_send) {
mwebView.loadUrl("http://www.newsweek.com/contact");
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
private class MyWebviewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
/* if (Uri.parse(url).getHost().equals("www.laughonlyblog.wordpress.com/about/")) {
//open url contents in webview
return false;
} else {
//here open external links in external browser or app
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
startActivity(intent);
} */
view.loadUrl(url);
return true;
}
//ProgressDialogue
ProgressDialog pd = null;
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
pd=new ProgressDialog(MainActivity.this);
pd.setTitle("Please Wait..");
pd.setMessage("Website is Loading..");
pd.show();
super.onPageStarted(view, url, favicon);
}
@Override
public void onPageFinished(WebView view, String url) {
pd.dismiss();
super.onPageFinished(view, url);
}
}
//goto previous page when pressing back button
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN) {
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
if (mwebView.canGoBack()) {
mwebView.goBack();
} else {
finish();
}
return true;
}
}
return super.onKeyDown(keyCode, event);
}
}
答案 0 :(得分：1)
为实现这一目标，请遵循以下步骤：
1）将WebChromeClient设置为您的webview
例如：WebView.setWebChromeClient(new MyChromeBrowser());
2）在WebChromeClient中实现onShowCustomView（）和onHideCustomView（）方法。
示例：`
private class MyChromeBrowser extends WebChromeClient {
@Override
public void onShowCustomView(View view, CustomViewCallback callback) {
super.onShowCustomView(view, callback);
}
@Override
public void onHideCustomView() {
super.onHideCustomView();
}
}`
3）在清单文件中为您的活动提供android:hardwareAccelerated="true"
示例：<activity android:name=".MainActivity"
android:hardwareAccelerated="true"
/>
更新：
要解决这个问题，请尝试以下方法：
更改这些行：webView.setWebChromeClient(new MyWebChromeClient());到
mWebChromeClient = new myWebChromeClient();
webView.setWebChromeClient(mWebChromeClient);
在initWebView（）方法中。
要让系统在全屏模式下确定最佳方向，请将此行添加到onShowCustomView（View视图，CustomViewCallback回调）方法：
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
更新日期：09-07-2017
或者你可以在webview中使用VideoEnabledWebView库来获得全屏viedo播放器等等。
链接：GitHub