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私はAndroid App開発に新規であり、何か助けが必要です。私はフラグメントWebViewを試したときにそれらが状態を正常に保持していることに気がつきましたが、ナビゲーション・ドロワーを使用するように切り替えると、ドロワー・アイテムをクリックするたびに、すでにロードされているドロワー・アイテムをクリックして戻るそれはちょうどWebViewをリロードします。フラグメントwebviewは毎回リロードされません。
MainActivityコード：
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
NavigationView navigationView = null;
Toolbar toolbar = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Set the fragment initially
MainFragment fragment = new MainFragment();
android.support.v4.app.FragmentTransaction fragmentTransaction =
getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();
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.addDrawerListener(toggle);
toggle.syncState();
navigationView = (NavigationView) findViewById(R.id.nav_view);
//How to change elements in the header programatically
View headerView = navigationView.getHeaderView(0);
navigationView.setNavigationItemSelectedListener(this);
}
@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
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_home) {
//Set the fragment initially
MainFragment fragment = new MainFragment();
android.support.v4.app.FragmentTransaction fragmentTransaction =
getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();
// Handle the camera action
} else if (id == R.id.nav_store) {
//Set the fragment initially
MyStoreFragment fragment = new MyStoreFragment();
android.support.v4.app.FragmentTransaction fragmentTransaction =
getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();
} else if (id == R.id.nav_blog) {
//Set the fragment initially
BlogFragment fragment = new BlogFragment();
android.support.v4.app.FragmentTransaction fragmentTransaction =
getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();
} else if (id == R.id.nav_billing) {
//Set the fragment initially
MyBillingFragment fragment = new MyBillingFragment();
android.support.v4.app.FragmentTransaction fragmentTransaction =
getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();
} else if (id == R.id.nav_data) {
//Set the fragment initially
MyDataFragment fragment = new MyDataFragment();
android.support.v4.app.FragmentTransaction fragmentTransaction =
getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
MainFragment（私は同じ設定を持つ他のフラグメントを持っている）：
public class MainFragment extends Fragment {
public MainFragment() {
// Required empty public constructor
}
private static ProgressBar progressBar;
private static WebView webView;
private static View v;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
super.onCreate(savedInstanceState);
v = inflater.inflate(R.layout.fragment_main, container, false);
progressBar = (ProgressBar) v.findViewById(R.id.progressBar);
progressBar.setMax(100);
webView = (WebView) v.findViewById(R.id.webView);
if(savedInstanceState != null){
webView.restoreState(savedInstanceState);
}else{
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setSupportZoom(false);
webView.getSettings().setBuiltInZoomControls(false);
webView.getSettings().setLoadWithOverviewMode(true);
webView.getSettings().setUseWideViewPort(true);
webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
webView.setBackgroundColor(Color.WHITE);
webView.setWebViewClient(new ourViewClient());
webView.setWebChromeClient(new WebChromeClient(){
public void onProgressChanged(WebView view, int progress){
progressBar.setProgress(progress);
if(progress < 100 && progressBar.getVisibility() == ProgressBar.GONE){
progressBar.setVisibility(ProgressBar.VISIBLE);
webView.setVisibility(View.GONE);
}
if(progress == 100){
progressBar.setVisibility(ProgressBar.GONE);
webView.setVisibility(View.VISIBLE);
}
}
});
webView.setOnKeyListener(new OnKeyListener(){
@Override
public boolean onKey(View v, int keyCode, KeyEvent event)
{
if(event.getAction() == KeyEvent.ACTION_DOWN)
{
WebView webView = (WebView) v;
switch(keyCode)
{
case KeyEvent.KEYCODE_BACK:
if(webView.canGoBack())
{
webView.goBack();
return true;
}
break;
}
}
return false;
}
});
String data = getActivity().getIntent().getDataString();
if(Intent.ACTION_VIEW.equals(getActivity().getIntent().getAction())){
webView.loadUrl(data);
}else{
webView.loadUrl("https://someurl");
}
}
return v;
}
public class ourViewClient extends WebViewClient {
@Override
public void onPageFinished(WebView view, String url){
super.onPageFinished(view, url);
view.setVisibility(View.VISIBLE);
view.bringToFront();
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon){
view.setVisibility(View.GONE);
}
}
@Override
public void onSaveInstanceState(Bundle outState){
super.onSaveInstanceState(outState);
webView.saveState(outState);
}
}
互換性のないエラーが発生しました：MainFragment fragment = fragment_container.get（ "home"）; MyStoreFragmentフラグメント= fragment_container.get（ "store"）;とBlogFragmentフラグメント= fragment_container.get（ "blog"）; – Infinixd
最終的なHashMap fragment_container = new HashMap <>（）;フラグメントをサポートするようにフラグメントを変更します。 –
Cyrus
ありがとうございます！ – Infinixd