我已经完成了所有操作，我可以看到抽屉导航，但我的应用程序崩溃了。任何人都可以解释以下代码中的问题是什么。现在，每当我尝试打开 ForumActivty 时，它就会崩溃。
public class ForumActivity extends AppCompatActivity implements AdvancedWebView.Listener{
public AdvancedWebView webView;
private ProgressBar mPbar = null;
private static final String url = "https://discuss.flarum.org/";
String webURL, webTitle ;
private DrawerLayout mDrawerLayout;
private Fragment fragment;
private FragmentManager fragmentManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
((CustomApplication)getApplication()).checkUserLogin();
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
setContentView(R.layout.activity_forum);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
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();
Bundle bundle = getIntent().getExtras();
if(bundle != null){
fragment = new ProfileFragment();
}else{
fragment = new TopicFragment();
}
fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.fragment_content, fragment).commit();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
int id = item.getItemId();
if (id == R.id.nav_topic) {
fragment = new TopicFragment();
}
else if(id == R.id.nav_profile){
fragment = new ProfileFragment();
}
else if(id == R.id.nav_scores){
fragment = new ScoreFragment();
}
else if(id == R.id.nav_share){
fragment = new ScoreFragment();
}
else if(id == R.id.nav_contact){
startActivity(new Intent(ForumActivity.this, ContactActivity.class));
}
else if(id == R.id.nav_settings){
fragment = new SettingsFragment();
}
else if(id == R.id.nav_logout){
((CustomApplication)getApplication()).getShared().setUserData("");
Intent logoutIntent = new Intent(ForumActivity.this, LoginActivity.class);
logoutIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(logoutIntent);
finish();
}
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.fragment_content, fragment).commit();
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
});
mPbar = (ProgressBar) findViewById(R.id.loader);
webView = (AdvancedWebView) findViewById(R.id.newWeb);
webView.loadUrl(url);
webView.setListener(this, this);
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setAppCacheEnabled(true);
webSettings.setDomStorageEnabled(true);
webSettings.setCacheMode(WebSettings.LOAD_DEFAULT);
webSettings.setAllowFileAccess(true);
CookieManager cookieManager = CookieManager.getInstance();
cookieManager.setAcceptCookie(true);
webView.setWebChromeClient(new WebChromeClient() {
@Override
public boolean onCreateWindow(WebView view, boolean isDialog, boolean isUserGesture, Message resultMsg) {
AdvancedWebView newWebView = new AdvancedWebView(ForumActivity.this);
WebView.WebViewTransport transport = (WebView.WebViewTransport) resultMsg.obj;
transport.setWebView(newWebView);
resultMsg.sendToTarget();
return true;
}
});
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
webSettings.setAllowUniversalAccessFromFileURLs(true);
} else {
webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}
webView.setWebViewClient(new WebViewClient(){
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
mPbar.setVisibility(View.VISIBLE);
}
public void onPageFinished(WebView view, String url) {
mPbar.setVisibility(View.GONE);
}
});
webView.setOnKeyListener( new View.OnKeyListener() {
@Override
public boolean onKey( View v, int keyCode, KeyEvent event ) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
webView.goBack();
return true;
}
return false;
}
});
webView.setThirdPartyCookiesEnabled(true);
webView.setCookiesEnabled(true);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
mDrawerLayout.openDrawer(GravityCompat.START);
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onResume() {
super.onResume();
webView.onResume();
}
@Override
protected void onPause() {
webView.onPause();
super.onPause();
}
@Override
protected void onDestroy() {
webView.onDestroy();
super.onDestroy();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
webView.onActivityResult(requestCode, resultCode, intent);
}
@Override
public void onBackPressed() {
if (!webView.onBackPressed()) { return; }
super.onBackPressed();
}
@Override
public void onPageStarted(String url, Bitmap favicon) {
}
@Override
public void onPageFinished(String url) {
webURL = webView.getUrl();
webTitle = webView.getTitle();
}
@Override
public void onPageError(int errorCode, String description, String failingUrl) {
}
@Override
public void onDownloadRequested(String url, String suggestedFilename, String mimeType, long contentLength, String contentDisposition, String userAgent) {
}
@Override
public void onExternalPageRequest(String url) {
}
}
我知道我在上面做错了什么，但我已经将所有内容都包含在布局中。如果有人能帮忙那就太好了
最佳答案
您还应该共享已经有抽屉导航的布局和 Activity 的代码。无论如何，您可以关注this指南。
对于您的布局文件，您需要将 CoordinatorLayout像这样在 DrawerLayout 中添加一个 NavigationView(检查已经有抽屉导航的其他 Activity 的 xml 布局并复制 <android.support.design.widget.NavigationView> 并替换为下面示例中的布局):
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.CoordinatorLayout
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/coordinator_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<im.delight.android.webview.AdvancedWebView
android:id="@+id/newWeb"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
></im.delight.android.webview.AdvancedWebView>
<ProgressBar
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/loader"
android:layout_weight="1"
android:layout_gravity="center_vertical|center_horizontal|center"/>
</android.support.design.widget.CoordinatorLayout>
<!-- Replace this with the one in other activity layout -->
<android.support.design.widget.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:menu="@menu/drawer_view"/>
</android.support.v4.widget.DrawerLayout>
之后，您需要在 Activity 类中添加一些代码。您可以检查我上面放置的链接，阅读后您可以了解需要从已经具有抽屉导航的其他 Activity 复制哪些代码。
关于java - 如何向工具栏添加抽屉导航切换，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/52212721/