Android Webview无法从按钮监听器加载URL。

huangapple
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英文:

Android Webview doesn't load the Url from button listener

问题

  1.     WebView wbvCheckURL;
  2.     Button btnSearch;
  4.     @Override
  5.     public void onCreate(Bundle savedInstanceState) {
  6.         super.onCreate(savedInstanceState);
  7.         setContentView(R.layout.activity_main);
  9.         wbvCheckURL = findViewById(R.id.wbvCheckURL);
  10.         btnSearch = findViewById(R.id.btnSearch);
  12.         wbvCheckURL.setWebChromeClient(new WebChromeClient() {
  13.             @Override
  14.             public void onProgressChanged(WebView view, int newProgress) {
  15.                 ...
  16.             }
  18.             @Override
  19.             public void onReceivedTitle(WebView view, String title) {
  20.                 ...
  21.             }
  22.         });
  23.         wbvCheckURL.getSettings().setJavaScriptEnabled(true);
  24.         wbvCheckURL.setWebViewClient(new WebViewClient());
  26.         // When i do it like this it works:
  27.         // wbvCheckURL.loadUrl("http://www.google.de");
  29.         btnSearch.setOnClickListener(new View.OnClickListener() {
  30.             public void onClick(View v) {
  31.                 wbvCheckURL.loadUrl("http://www.google.de");
  33.                 hideKeyboard(v);
  34.                 LoadCode();
  35.             }
  36.         });
  37.     }
英文:

It loads the site but only when it's not in the Action Listener.
Even if I load the url way down in the onCreate method it works.
I already checked if the Webview is invisible, the button listener works also.

The problem began after a few hours of coding other things

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

  1. WebView wbvCheckURL;
  2. Button btnSearch;
  4. @Override
  5.     public void onCreate(Bundle savedInstanceState) {
  6.         super.onCreate(savedInstanceState);
  7.         setContentView(R.layout.activity_main);
  9.         wbvCheckURL = findViewById(R.id.wbvCheckURL);
  10.         btnSearch = findViewById(R.id.btnSearch);
  11.         
  12.         wbvCheckURL.setWebChromeClient(new WebChromeClient() {
  13.             @Override
  14.             public void onProgressChanged(WebView view, int newProgress) {
  15.                 ...
  16.             }
  18.             @Override
  19.             public void onReceivedTitle(WebView view, String title) {
  20.                 ...
  21.             }
  22.         });
  23.         wbvCheckURL.getSettings().setJavaScriptEnabled(true);
  24.         wbvCheckURL.setWebViewClient(new WebViewClient());
  25.         
  26.         // When i do it like this it works:
  27.         // wbvCheckURL.loadUrl(&quot;http://www.google.de&quot;);
  29.         btnSearch.setOnClickListener(new View.OnClickListener() {
  30.             public void onClick(View v) {
  31.                 wbvCheckURL.loadUrl(&quot;http://www.google.de&quot;);
  33.                 hideKeyboard(v);
  34.                 LoadCode();
  35.             }
  36.         });
  37.     }

<!-- end snippet -->

答案1

得分: 0

解决方案是在线程中加载它

> 创建实例并启动线程：

  1. LoadURL t = new LoadURL();
  2. t.start();

> 线程类：

  1. class LoadURL extends Thread {
  2. public void run() {
  3.     Classname.wbvCheckURL.post(new Runnable() {
  4.            public void run() {
  5.                Classname.wbvCheckURL.loadUrl("http://www.google.de");
  6.            }
  7.     });
  8. }
英文:

The Solution is to load it in a Thread

> Create instance and start the thread:

  1. LoadURL  t = new LoadURL();
  2. t.start();

> Thread class:

  1. class LoadURL extends Thread {
  2. public void run() {
  3.     Classname.wbvCheckURL.post(new Runnable() {
  4.            public void run() {
  5.                Classname.wbvCheckURL.loadUrl(&quot;http://www.google.de&quot;);
  6.            }
  7.     });
  8. }

答案2

得分: 0

你可以尝试使用我的代码。我的代码中包含另一种带有抽屉布局（Drawer Layout）的 Web 视图（WebView）。希望你能理解如何插入 Web 视图。

  1. package com.example.appname;
  3. import android.content.Intent;
  4. import android.os.Bundle;
  5. import android.view.View;
  6. import android.webkit.WebSettings;
  7. import android.webkit.WebView;
  8. import android.webkit.WebViewClient;
  9. import android.widget.ImageButton;
  11. import androidx.appcompat.app.AppCompatActivity;
  12. import androidx.appcompat.widget.Toolbar;
  14. public class Provokinc extends AppCompatActivity {
  16.     private WebView webView;
  18.     @Override
  19.     protected void onCreate(Bundle savedInstanceState) {
  20.         super.onCreate(savedInstanceState);
  21.         setContentView(R.layout.activity_provokinc);
  22.         Toolbar toolbar = findViewById(R.id.toolbar);
  23.         setSupportActionBar(toolbar);
  24.         webView = findViewById(R.id.webView);
  25.         webView.setWebViewClient(new WebViewClient());
  26.         webView.loadUrl("https://stackoverflow.com/questions/63438455/android-webview-doesnt-load-the-url-from-button-listener");
  28.         WebSettings webSettings = webView.getSettings();
  29.         webSettings.setJavaScriptEnabled(true);
  31.         ImageButton ImageButton = findViewById(R.id.imageButtonA);
  32.         ImageButton ImageButton1 = findViewById(R.id.imageButtonB);
  33.         ImageButton ImageButton2 = findViewById(R.id.imageButtonC);
  34.         ImageButton ImageButton3 = findViewById(R.id.imageButtonD);
  35.         ImageButton ImageButton4 = findViewById(R.id.imageButtonE);
  37.         ImageButton.setOnClickListener(new View.OnClickListener() {
  38.             @Override
  39.             public void onClick(View v) {
  40.                 Intent int1 = new Intent(Provokinc.this, Main3Activity.class);
  41.                 startActivity(int1);
  42.             }
  43.         });
  45.         ImageButton1.setOnClickListener(new View.OnClickListener() {
  46.             @Override
  47.             public void onClick(View v) {
  48.                 Intent int2 = new Intent(Provokinc.this, Main2Activity.class);
  49.                 startActivity(int2);
  50.             }
  51.         });
  53.         ImageButton2.setOnClickListener(new View.OnClickListener() {
  54.             @Override
  55.             public void onClick(View v) {
  56.                 Intent int3 = new Intent(Provokinc.this, Provokinc.class);
  57.                 startActivity(int3);
  58.             }
  59.         });
  61.         ImageButton3.setOnClickListener(new View.OnClickListener() {
  62.             @Override
  63.             public void onClick(View v) {
  64.                 Intent int4 = new Intent(Provokinc.this, ActivityItemDetails.class);
  65.                 startActivity(int4);
  66.             }
  67.         });
  69.         ImageButton4.setOnClickListener(new View.OnClickListener() {
  70.             @Override
  71.             public void onClick(View v) {
  72.                 Intent int5 = new Intent(Provokinc.this, MainActivity.class);
  73.                 startActivity(int5);
  74.             }
  75.         });
  76.     }
  78.     @Override
  79.     public void onBackPressed(){
  80.         if(webView.canGoBack()){
  81.             webView.goBack();
  82.         } else{
  83.             super.onBackPressed();
  84.         }
  85.     }
  86. }
英文:

you can try mine. Mine is another kind of webview with Drawer Layout. Hope you get the idea on how to insert the webview.

  1. package com.example.appname;
  2. import android.content.Intent;
  3. import android.os.Bundle;
  4. import android.view.Menu;
  5. import android.view.MenuItem;
  6. import android.view.View;
  7. import android.webkit.WebSettings;
  8. import android.webkit.WebView;
  9. import android.webkit.WebViewClient;
  10. import android.widget.ImageButton;
  11. import androidx.appcompat.app.AppCompatActivity;
  12. import androidx.appcompat.widget.ShareActionProvider;
  13. import androidx.appcompat.widget.Toolbar;
  14. import androidx.core.view.MenuItemCompat;
  15. public class Provokinc extends AppCompatActivity {
  16. private WebView webView;
  17. @Override
  18. protected void onCreate(Bundle savedInstanceState) {
  19. super.onCreate(savedInstanceState);
  20. setContentView(R.layout.activity_provokinc);
  21. Toolbar toolbar = findViewById(R.id.toolbar);
  22. setSupportActionBar(toolbar);
  23. webView = findViewById(R.id.webView);
  24. webView.setWebViewClient(new WebViewClient());
  25. webView.loadUrl(&quot;https://stackoverflow.com/questions/63438455/android-webview-doesnt-load-the-url-from-button-listener&quot;);
  26. WebSettings webSettings = webView.getSettings();
  27. webSettings.setJavaScriptEnabled(true);
  28. ImageButton ImageButton = (ImageButton) findViewById(R.id.imageButtonA);
  29. ImageButton ImageButton1 = (ImageButton) findViewById(R.id.imageButtonB);
  30. ImageButton ImageButton2 = (ImageButton) findViewById(R.id.imageButtonC);
  31. ImageButton ImageButton3 = (ImageButton) findViewById(R.id.imageButtonD);
  32. ImageButton ImageButton4 = (ImageButton) findViewById(R.id.imageButtonE);
  33. ImageButton.setOnClickListener(new View.OnClickListener() {
  34. @Override
  35. public void onClick(View v) {
  36. Intent int1 = new Intent(Provokinc.this,Main3Activity.class);
  37. startActivity(int1);
  38. }
  39. });
  40. ImageButton1.setOnClickListener(new View.OnClickListener() {
  41. @Override
  42. public void onClick(View v) {
  43. Intent int2 = new Intent(Provokinc.this, Main2Activity.class);
  44. startActivity(int2);
  45. }
  46. });
  47. ImageButton2.setOnClickListener(new View.OnClickListener() {
  48. @Override
  49. public void onClick(View v) {
  50. Intent int3 = new Intent(Provokinc.this, Provokinc.class);
  51. startActivity(int3);
  52. }
  53. });
  54. ImageButton3.setOnClickListener(new View.OnClickListener() {
  55. @Override
  56. public void onClick(View v) {
  57. Intent int4 = new Intent(Provokinc.this, ActivityItemDetails.class);
  58. startActivity(int4);
  59. }
  60. });
  61. ImageButton4.setOnClickListener(new View.OnClickListener() {
  62. @Override
  63. public void onClick(View v) {
  64. Intent int5 = new Intent(Provokinc.this, MainActivity.class);
  65. startActivity(int5);
  66. }
  67. });
  68. }
  69. @Override
  70. public void onBackPressed(){
  71. if(webView.canGoBack()){
  72. webView.goBack();
  73. }                 else{
  74. super.onBackPressed();
  75. }
  76. }
  77. }

huangapple
  • 本文由 发表于 2020年8月16日 23:09:05
  • 转载请务必保留本文链接：https://go.coder-hub.com/63438455.html
  • android
  • java
  • webview
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