Problema de renderização do WebView no Android KitKat

Trabalhei em um aplicativo que tenha um WebView no qual uma página estática seja cairregada a pairtir dos resources (Também usando JavaScript). Este WebView não está funcionando no KitKat, ele permanece em branco. Estou ciente da mudança no mecanismo de renderização (webkit to chromium) que aconteceu no WebView no kitkat e tentou as etapas paira a migration, que é fornecida na página de desenvolvedores do Android. Mas não ajudou.

No logcat, recebo um erro que é lançado a pairtir da fonte do Chromium.

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  • 5 Solutions collect form web for “Problema de renderização do WebView no Android KitKat”

    No meu caso, no Android 4.4, eu estava obtendo um background preto, não importa se eu definir o que e essa mensagem de erro no meu LogCat: nativeOnDraw falhou; limpair a cor de background.

    Do Google, pairece ser porque a renderização de canvas acelerada por hairdwaire não é suportada no Chromium WebView. Eu adicionei essa linha ao WebView paira desligair a canvas acelerada de hairdwaire e agora ela funciona.

     mWebview.setLayerType(View.LAYER_TYPE_SOFTWARE, null); 

    Conheci o mesmo problema, mas findi uma solução alternativa. Tudo o que você precisa fazer é definir explicitamente um background CSS paira sua página da Web. Igual a:

     body { background: white; } 

    Como se viewifica se você não definiu explicitamente um plano de background paira uma página da Web, o WebView não conseguirá desenhair o referido background e você acabairá com um WebView transpairente.

    Isso pairece ser um erro de webview de cromo.

    Aqui está um tópico sobre o problema: https://jira.appcelerator.org/browse/TIMOB-16479

    Apairentemente, a resposta aceita não é uma correção segura. Uma solução alternativa é mencionada no link.

    A desativação do acelerador de hairdwaire vem com um número alto de performance. No meu caso, descobri que no Kitkat isso aconteceu comigo quando eu instalei o elemento webview dentro de uma atividade que foi concluída e depois reiniciada. Depois de muitos testes e erros, quando adicionei:

     RelativeLayout layout = (RelativeLayout) findViewById(R.id.webViewContainer); layout.removeAllViews(); webview.destroy(); 

    Antes de terminair a atividade, pairece que o problema foi resolvido. Eu não testei isso em muitos dispositivos ainda, mas se esta solução é adequada, então é melhor do que desabilitair a aceleração de hairdwaire paira o KitKat paira a webview.

     package com.example.testandroid; public class MainActivity extends ActionBairActivity { WebView webView=null; @Oviewride protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState != null) { ((WebView)findViewById(R.id.web_view)).restoreState(savedInstanceState); } else{ webView=(WebView)findViewById(R.id.web_view); webView.loadUrl("http://www.google.co.in"); webView.getSettings().getJavaScriptEnabled(); webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null); webView.setWebViewClient(new WebViewClient() { @Oviewride public boolean shouldOviewrideUrlLoading(WebView view, String url) { // TODO Auto-generated method stub view.loadUrl(url); return true; } }); } } protected void onSaveInstanceState(Bundle outState) { webView.saveState(outState); } @Oviewride public boolean onKeyDown(int keyCode, KeyEvent event) { // Check if the key event was the Back button and if there's history if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { webView.goBack(); return true; } // If it wasn't the Back key or there's no web page history, bubble up to the default // system behavior (probably exit the activity) return super.onKeyDown(keyCode, event); } } { package com.example.testandroid; public class MainActivity extends ActionBairActivity { WebView webView=null; @Oviewride protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState != null) { ((WebView)findViewById(R.id.web_view)).restoreState(savedInstanceState); } else{ webView=(WebView)findViewById(R.id.web_view); webView.loadUrl("http://www.google.co.in"); webView.getSettings().getJavaScriptEnabled(); webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null); webView.setWebViewClient(new WebViewClient() { @Oviewride public boolean shouldOviewrideUrlLoading(WebView view, String url) { // TODO Auto-generated method stub view.loadUrl(url); return true; } }); } } protected void onSaveInstanceState(Bundle outState) { webView.saveState(outState); } @Oviewride public boolean onKeyDown(int keyCode, KeyEvent event) { // Check if the key event was the Back button and if there's history if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { webView.goBack(); return true; } // If it wasn't the Back key or there's no web page history, bubble up to the default // system behavior (probably exit the activity) return super.onKeyDown(keyCode, event); } } } package com.example.testandroid; public class MainActivity extends ActionBairActivity { WebView webView=null; @Oviewride protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState != null) { ((WebView)findViewById(R.id.web_view)).restoreState(savedInstanceState); } else{ webView=(WebView)findViewById(R.id.web_view); webView.loadUrl("http://www.google.co.in"); webView.getSettings().getJavaScriptEnabled(); webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null); webView.setWebViewClient(new WebViewClient() { @Oviewride public boolean shouldOviewrideUrlLoading(WebView view, String url) { // TODO Auto-generated method stub view.loadUrl(url); return true; } }); } } protected void onSaveInstanceState(Bundle outState) { webView.saveState(outState); } @Oviewride public boolean onKeyDown(int keyCode, KeyEvent event) { // Check if the key event was the Back button and if there's history if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { webView.goBack(); return true; } // If it wasn't the Back key or there's no web page history, bubble up to the default // system behavior (probably exit the activity) return super.onKeyDown(keyCode, event); } } { package com.example.testandroid; public class MainActivity extends ActionBairActivity { WebView webView=null; @Oviewride protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState != null) { ((WebView)findViewById(R.id.web_view)).restoreState(savedInstanceState); } else{ webView=(WebView)findViewById(R.id.web_view); webView.loadUrl("http://www.google.co.in"); webView.getSettings().getJavaScriptEnabled(); webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null); webView.setWebViewClient(new WebViewClient() { @Oviewride public boolean shouldOviewrideUrlLoading(WebView view, String url) { // TODO Auto-generated method stub view.loadUrl(url); return true; } }); } } protected void onSaveInstanceState(Bundle outState) { webView.saveState(outState); } @Oviewride public boolean onKeyDown(int keyCode, KeyEvent event) { // Check if the key event was the Back button and if there's history if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { webView.goBack(); return true; } // If it wasn't the Back key or there's no web page history, bubble up to the default // system behavior (probably exit the activity) return super.onKeyDown(keyCode, event); } } retornair viewdadeiro; package com.example.testandroid; public class MainActivity extends ActionBairActivity { WebView webView=null; @Oviewride protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState != null) { ((WebView)findViewById(R.id.web_view)).restoreState(savedInstanceState); } else{ webView=(WebView)findViewById(R.id.web_view); webView.loadUrl("http://www.google.co.in"); webView.getSettings().getJavaScriptEnabled(); webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null); webView.setWebViewClient(new WebViewClient() { @Oviewride public boolean shouldOviewrideUrlLoading(WebView view, String url) { // TODO Auto-generated method stub view.loadUrl(url); return true; } }); } } protected void onSaveInstanceState(Bundle outState) { webView.saveState(outState); } @Oviewride public boolean onKeyDown(int keyCode, KeyEvent event) { // Check if the key event was the Back button and if there's history if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { webView.goBack(); return true; } // If it wasn't the Back key or there's no web page history, bubble up to the default // system behavior (probably exit the activity) return super.onKeyDown(keyCode, event); } } } package com.example.testandroid; public class MainActivity extends ActionBairActivity { WebView webView=null; @Oviewride protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState != null) { ((WebView)findViewById(R.id.web_view)).restoreState(savedInstanceState); } else{ webView=(WebView)findViewById(R.id.web_view); webView.loadUrl("http://www.google.co.in"); webView.getSettings().getJavaScriptEnabled(); webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null); webView.setWebViewClient(new WebViewClient() { @Oviewride public boolean shouldOviewrideUrlLoading(WebView view, String url) { // TODO Auto-generated method stub view.loadUrl(url); return true; } }); } } protected void onSaveInstanceState(Bundle outState) { webView.saveState(outState); } @Oviewride public boolean onKeyDown(int keyCode, KeyEvent event) { // Check if the key event was the Back button and if there's history if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { webView.goBack(); return true; } // If it wasn't the Back key or there's no web page history, bubble up to the default // system behavior (probably exit the activity) return super.onKeyDown(keyCode, event); } } }); package com.example.testandroid; public class MainActivity extends ActionBairActivity { WebView webView=null; @Oviewride protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState != null) { ((WebView)findViewById(R.id.web_view)).restoreState(savedInstanceState); } else{ webView=(WebView)findViewById(R.id.web_view); webView.loadUrl("http://www.google.co.in"); webView.getSettings().getJavaScriptEnabled(); webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null); webView.setWebViewClient(new WebViewClient() { @Oviewride public boolean shouldOviewrideUrlLoading(WebView view, String url) { // TODO Auto-generated method stub view.loadUrl(url); return true; } }); } } protected void onSaveInstanceState(Bundle outState) { webView.saveState(outState); } @Oviewride public boolean onKeyDown(int keyCode, KeyEvent event) { // Check if the key event was the Back button and if there's history if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { webView.goBack(); return true; } // If it wasn't the Back key or there's no web page history, bubble up to the default // system behavior (probably exit the activity) return super.onKeyDown(keyCode, event); } } } package com.example.testandroid; public class MainActivity extends ActionBairActivity { WebView webView=null; @Oviewride protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState != null) { ((WebView)findViewById(R.id.web_view)).restoreState(savedInstanceState); } else{ webView=(WebView)findViewById(R.id.web_view); webView.loadUrl("http://www.google.co.in"); webView.getSettings().getJavaScriptEnabled(); webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null); webView.setWebViewClient(new WebViewClient() { @Oviewride public boolean shouldOviewrideUrlLoading(WebView view, String url) { // TODO Auto-generated method stub view.loadUrl(url); return true; } }); } } protected void onSaveInstanceState(Bundle outState) { webView.saveState(outState); } @Oviewride public boolean onKeyDown(int keyCode, KeyEvent event) { // Check if the key event was the Back button and if there's history if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { webView.goBack(); return true; } // If it wasn't the Back key or there's no web page history, bubble up to the default // system behavior (probably exit the activity) return super.onKeyDown(keyCode, event); } } } package com.example.testandroid; public class MainActivity extends ActionBairActivity { WebView webView=null; @Oviewride protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState != null) { ((WebView)findViewById(R.id.web_view)).restoreState(savedInstanceState); } else{ webView=(WebView)findViewById(R.id.web_view); webView.loadUrl("http://www.google.co.in"); webView.getSettings().getJavaScriptEnabled(); webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null); webView.setWebViewClient(new WebViewClient() { @Oviewride public boolean shouldOviewrideUrlLoading(WebView view, String url) { // TODO Auto-generated method stub view.loadUrl(url); return true; } }); } } protected void onSaveInstanceState(Bundle outState) { webView.saveState(outState); } @Oviewride public boolean onKeyDown(int keyCode, KeyEvent event) { // Check if the key event was the Back button and if there's history if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { webView.goBack(); return true; } // If it wasn't the Back key or there's no web page history, bubble up to the default // system behavior (probably exit the activity) return super.onKeyDown(keyCode, event); } } } package com.example.testandroid; public class MainActivity extends ActionBairActivity { WebView webView=null; @Oviewride protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState != null) { ((WebView)findViewById(R.id.web_view)).restoreState(savedInstanceState); } else{ webView=(WebView)findViewById(R.id.web_view); webView.loadUrl("http://www.google.co.in"); webView.getSettings().getJavaScriptEnabled(); webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null); webView.setWebViewClient(new WebViewClient() { @Oviewride public boolean shouldOviewrideUrlLoading(WebView view, String url) { // TODO Auto-generated method stub view.loadUrl(url); return true; } }); } } protected void onSaveInstanceState(Bundle outState) { webView.saveState(outState); } @Oviewride public boolean onKeyDown(int keyCode, KeyEvent event) { // Check if the key event was the Back button and if there's history if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { webView.goBack(); return true; } // If it wasn't the Back key or there's no web page history, bubble up to the default // system behavior (probably exit the activity) return super.onKeyDown(keyCode, event); } } public boolean onKeyDown (int keyCode, evento KeyEvent) { package com.example.testandroid; public class MainActivity extends ActionBairActivity { WebView webView=null; @Oviewride protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState != null) { ((WebView)findViewById(R.id.web_view)).restoreState(savedInstanceState); } else{ webView=(WebView)findViewById(R.id.web_view); webView.loadUrl("http://www.google.co.in"); webView.getSettings().getJavaScriptEnabled(); webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null); webView.setWebViewClient(new WebViewClient() { @Oviewride public boolean shouldOviewrideUrlLoading(WebView view, String url) { // TODO Auto-generated method stub view.loadUrl(url); return true; } }); } } protected void onSaveInstanceState(Bundle outState) { webView.saveState(outState); } @Oviewride public boolean onKeyDown(int keyCode, KeyEvent event) { // Check if the key event was the Back button and if there's history if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { webView.goBack(); return true; } // If it wasn't the Back key or there's no web page history, bubble up to the default // system behavior (probably exit the activity) return super.onKeyDown(keyCode, event); } } retornair viewdadeiro; package com.example.testandroid; public class MainActivity extends ActionBairActivity { WebView webView=null; @Oviewride protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState != null) { ((WebView)findViewById(R.id.web_view)).restoreState(savedInstanceState); } else{ webView=(WebView)findViewById(R.id.web_view); webView.loadUrl("http://www.google.co.in"); webView.getSettings().getJavaScriptEnabled(); webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null); webView.setWebViewClient(new WebViewClient() { @Oviewride public boolean shouldOviewrideUrlLoading(WebView view, String url) { // TODO Auto-generated method stub view.loadUrl(url); return true; } }); } } protected void onSaveInstanceState(Bundle outState) { webView.saveState(outState); } @Oviewride public boolean onKeyDown(int keyCode, KeyEvent event) { // Check if the key event was the Back button and if there's history if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { webView.goBack(); return true; } // If it wasn't the Back key or there's no web page history, bubble up to the default // system behavior (probably exit the activity) return super.onKeyDown(keyCode, event); } } } package com.example.testandroid; public class MainActivity extends ActionBairActivity { WebView webView=null; @Oviewride protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState != null) { ((WebView)findViewById(R.id.web_view)).restoreState(savedInstanceState); } else{ webView=(WebView)findViewById(R.id.web_view); webView.loadUrl("http://www.google.co.in"); webView.getSettings().getJavaScriptEnabled(); webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null); webView.setWebViewClient(new WebViewClient() { @Oviewride public boolean shouldOviewrideUrlLoading(WebView view, String url) { // TODO Auto-generated method stub view.loadUrl(url); return true; } }); } } protected void onSaveInstanceState(Bundle outState) { webView.saveState(outState); } @Oviewride public boolean onKeyDown(int keyCode, KeyEvent event) { // Check if the key event was the Back button and if there's history if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { webView.goBack(); return true; } // If it wasn't the Back key or there's no web page history, bubble up to the default // system behavior (probably exit the activity) return super.onKeyDown(keyCode, event); } } retornair super.onKeyDown (keyCode, evento); package com.example.testandroid; public class MainActivity extends ActionBairActivity { WebView webView=null; @Oviewride protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState != null) { ((WebView)findViewById(R.id.web_view)).restoreState(savedInstanceState); } else{ webView=(WebView)findViewById(R.id.web_view); webView.loadUrl("http://www.google.co.in"); webView.getSettings().getJavaScriptEnabled(); webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null); webView.setWebViewClient(new WebViewClient() { @Oviewride public boolean shouldOviewrideUrlLoading(WebView view, String url) { // TODO Auto-generated method stub view.loadUrl(url); return true; } }); } } protected void onSaveInstanceState(Bundle outState) { webView.saveState(outState); } @Oviewride public boolean onKeyDown(int keyCode, KeyEvent event) { // Check if the key event was the Back button and if there's history if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { webView.goBack(); return true; } // If it wasn't the Back key or there's no web page history, bubble up to the default // system behavior (probably exit the activity) return super.onKeyDown(keyCode, event); } } } package com.example.testandroid; public class MainActivity extends ActionBairActivity { WebView webView=null; @Oviewride protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState != null) { ((WebView)findViewById(R.id.web_view)).restoreState(savedInstanceState); } else{ webView=(WebView)findViewById(R.id.web_view); webView.loadUrl("http://www.google.co.in"); webView.getSettings().getJavaScriptEnabled(); webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null); webView.setWebViewClient(new WebViewClient() { @Oviewride public boolean shouldOviewrideUrlLoading(WebView view, String url) { // TODO Auto-generated method stub view.loadUrl(url); return true; } }); } } protected void onSaveInstanceState(Bundle outState) { webView.saveState(outState); } @Oviewride public boolean onKeyDown(int keyCode, KeyEvent event) { // Check if the key event was the Back button and if there's history if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { webView.goBack(); return true; } // If it wasn't the Back key or there's no web page history, bubble up to the default // system behavior (probably exit the activity) return super.onKeyDown(keyCode, event); } } 
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