[英]Hide a menu item when a specific URL is loaded in WebView
我有一個基本的WebView活動。 這樣,我有一個菜單項,該菜單項啟動“共享”意圖,並允許用戶共享當時在瀏覽的URL。 我也有一個錯誤HTML頁面,當WebView收到任何HTTP錯誤時就會加載該頁面。 因此,基本上,我希望在加載該錯誤文檔時隱藏“共享”菜單項(或至少共享一些我可以設置的其他URL)。
這是我的MainActiviity.java:
package com.ananya.brokenhearts;
import android.annotation.SuppressLint;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.webkit.WebChromeClient;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.Toast;
@SuppressWarnings("deprecation")
public class MainActivity extends AppCompatActivity
{
private WebView WebView;
private ProgressBar ProgressBar;
private LinearLayout LinearLayout;
private String currentURL;
@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
WebView = findViewById(R.id.webView);
ProgressBar = findViewById(R.id.progressBar);
LinearLayout = findViewById(R.id.layout);
ProgressBar.setMax(100);
WebView.loadUrl("https://www.brokenhearts.ml/index.html");
WebView.getSettings().setJavaScriptEnabled(true);
WebView.setWebViewClient(new WebViewClient()
{
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon)
{
LinearLayout.setVisibility(View.VISIBLE);
super.onPageStarted(view, url, favicon);
}
@Override
public void onPageFinished(WebView view, String url)
{
LinearLayout.setVisibility(View.GONE);
super.onPageFinished(view, url);
currentURL = url;
}
public void onReceivedError(WebView webview, int i, String s, String s1)
{
WebView.loadUrl("file:///android_asset/error.html");
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url2)
{
if (url2.contains("www.brokenhearts.ml"))
{
view.loadUrl(url2);
return false;
} else
{
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url2));
startActivity(intent);
return true;
}
}
});
WebView.setWebChromeClient(new WebChromeClient()
{
@Override
public void onProgressChanged(WebView view, int newProgress)
{
super.onProgressChanged(view, newProgress);
ProgressBar.setProgress(newProgress);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.menu, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.backward:
onBackPressed();
break;
case R.id.forward:
onForwardPressed();
break;
case R.id.refresh:
WebView.reload();
break;
case R.id.share:
Intent shareIntent = new Intent(Intent.ACTION_SEND);
shareIntent.setType("text/plain");
shareIntent.putExtra(Intent.EXTRA_TEXT,currentURL);
shareIntent.putExtra(Intent.EXTRA_SUBJECT,"Copied URL");
startActivity(Intent.createChooser(shareIntent,"Share URL"));
break;
case R.id.exit:
new AlertDialog.Builder(this,R.style.AlertDialog)
.setIcon(R.drawable.ic_error_black_24dp)
.setTitle("Are you sure you want to exit?")
.setMessage("Tapping 'Yes' will close the app. Tap 'No' to continue using the app")
.setPositiveButton("Yes",
new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
finish();
}
})
.setNegativeButton("No", null)
.show();
break;
}
return super.onOptionsItemSelected(item);
}
private void onForwardPressed()
{
if (WebView.canGoForward())
{
WebView.goForward();
} else
{
Toast.makeText(this, "Can't go further", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onBackPressed ()
{
if (WebView.canGoBack())
{
WebView.goBack();
} else
{
new AlertDialog.Builder(this,R.style.AlertDialog)
.setIcon(R.drawable.ic_error_black_24dp)
.setTitle("Are you sure you want to exit?")
.setMessage("Tapping 'Yes' will close the app. Tap 'No' to continue using the app")
.setPositiveButton("Yes",
new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
finish();
}
})
.setNegativeButton("No", null)
.show();
}
}
}
關於隱藏共享菜單圖標,如果出現錯誤標志,則始終可以使用onPrepareOptionsMenu()
來隱藏共享菜單。
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
super.onPrepareOptionsMenu(menu);
menu.findItem(R.id.share).setVisible(!isPageError);
return true;
}
這將要求您將isPageError
布爾值設置為true
@Override
public void onReceivedError(WebView webview, int i, String s, String s1{
isPageError = true;
}
我通過將錯誤頁面移至另一個活動來解決了該問題。 這是我的新MainActiviy.java:
package com.ananya.brokenhearts;
import android.annotation.SuppressLint;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.webkit.WebChromeClient;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.Toast;
@SuppressWarnings("deprecation")
public class MainActivity extends AppCompatActivity
{
private WebView WebView;
private ProgressBar ProgressBar;
private LinearLayout LinearLayout;
private String currentURL;
@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
WebView = findViewById(R.id.webView);
ProgressBar = findViewById(R.id.progressBar);
LinearLayout = findViewById(R.id.layout);
ProgressBar.setMax(100);
WebView.loadUrl("https://www.brokenhearts.ml/index.html");
WebView.getSettings().setJavaScriptEnabled(true);
WebView.getSettings().setUserAgentString("Broken Hearts/1.0");
WebView.setWebViewClient(new WebViewClient()
{
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon)
{
LinearLayout.setVisibility(View.VISIBLE);
super.onPageStarted(view, url, favicon);
}
@Override
public void onPageFinished(WebView view, String url)
{
LinearLayout.setVisibility(View.GONE);
super.onPageFinished(view, url);
currentURL = url;
}
@Override
public void onReceivedError(WebView webview, int i, String s, String s1)
{
WebView.loadUrl("file:///android_asset/error.html");
Intent intent = new Intent(MainActivity.this, ErrorActivity.class);
startActivity(intent);
finish();
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url2)
{
if (url2.contains("www.brokenhearts.ml"))
{
view.loadUrl(url2);
return false;
} else
{
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url2));
startActivity(intent);
return true;
}
}
});
WebView.setWebChromeClient(new WebChromeClient()
{
@Override
public void onProgressChanged(WebView view, int newProgress)
{
super.onProgressChanged(view, newProgress);
ProgressBar.setProgress(newProgress);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.menu, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.backward:
onBackPressed();
break;
case R.id.forward:
onForwardPressed();
break;
case R.id.refresh:
WebView.reload();
break;
case R.id.share:
Intent shareIntent = new Intent(Intent.ACTION_SEND);
shareIntent.setType("text/plain");
shareIntent.putExtra(Intent.EXTRA_TEXT,currentURL);
shareIntent.putExtra(Intent.EXTRA_SUBJECT,"Copied URL");
startActivity(Intent.createChooser(shareIntent,"Share URL"));
break;
case R.id.update:
Intent intent = new Intent(MainActivity.this, UpdateActivity.class);
startActivity(intent);
finish();
break;
case R.id.exit:
new AlertDialog.Builder(this,R.style.AlertDialog)
.setIcon(R.drawable.ic_error_black_24dp)
.setTitle("Are you sure you want to exit?")
.setMessage("Tapping 'Yes' will close the app. Tap 'No' to continue using the app")
.setPositiveButton("Yes",
new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
finish();
}
})
.setNegativeButton("No", null)
.show();
break;
}
return super.onOptionsItemSelected(item);
}
private void onForwardPressed()
{
if (WebView.canGoForward())
{
WebView.goForward();
} else
{
Toast.makeText(this, "Can't go further", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onBackPressed ()
{
if (WebView.canGoBack())
{
WebView.goBack();
} else
{
new AlertDialog.Builder(this,R.style.AlertDialog)
.setIcon(R.drawable.ic_error_black_24dp)
.setTitle("Are you sure you want to exit?")
.setMessage("Tapping 'Yes' will close the app. Tap 'No' to continue using the app")
.setPositiveButton("Yes",
new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
finish();
}
})
.setNegativeButton("No", null)
.show();
}
}
}
和ErrorActivity.java:
package com.ananya.brokenhearts;
import android.annotation.SuppressLint;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.webkit.WebChromeClient;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
@SuppressWarnings("deprecation")
public class ErrorActivity extends AppCompatActivity
{
private ProgressBar ProgressBar;
private LinearLayout LinearLayout;
@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_error);
android.webkit.WebView webView = findViewById(R.id.webView3);
ProgressBar = findViewById(R.id.progressBar3);
LinearLayout = findViewById(R.id.layout3);
ProgressBar.setMax(100);
webView.loadUrl("file:///android_asset/error.html");
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setUserAgentString("Broken Hearts/1.0");
webView.setWebViewClient(new WebViewClient()
{
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon)
{
LinearLayout.setVisibility(View.VISIBLE);
super.onPageStarted(view, url, favicon);
}
@Override
public void onPageFinished(WebView view, String url)
{
LinearLayout.setVisibility(View.GONE);
}
});
webView.setWebChromeClient(new WebChromeClient()
{
@Override
public void onProgressChanged(WebView view, int newProgress)
{
super.onProgressChanged(view, newProgress);
ProgressBar.setProgress(newProgress);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.menu3, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.refresh:
Intent intent = new Intent(ErrorActivity.this, MainActivity.class);
startActivity(intent);
finish();
break;
case R.id.update:
Intent intent2 = new Intent(ErrorActivity.this, UpdateActivity.class);
startActivity(intent2);
finish();
break;
case R.id.exit:
new AlertDialog.Builder(this,R.style.AlertDialog)
.setIcon(R.drawable.ic_error_black_24dp)
.setTitle("Are you sure you want to exit?")
.setMessage("Tapping 'Yes' will close the app. Tap 'No' to continue using the app")
.setPositiveButton("Yes",
new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
finish();
}
})
.setNegativeButton("No", null)
.show();
break;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onBackPressed ()
{
new AlertDialog.Builder(this,R.style.AlertDialog)
.setIcon(R.drawable.ic_error_black_24dp)
.setTitle("Are you sure you want to exit?")
.setMessage("Tapping 'Yes' will close the app. Tap 'No' to continue using the app")
.setPositiveButton("Yes",
new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
finish();
}
})
.setNegativeButton("No", null)
.show();
}
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.