=====Android=====
====webviewのデバッグ====
===WebViewClient====
webViewClientのonReceivedErrorとかを使う。
[[http://developer.android.com/reference/android/webkit/WebViewClient.html| webViewClient]]
<code java>
public class MainActivity extends Activity{

  WebView webview = new WebView(this);
  setContentView(webview);
  webview.loadUrl("http://example.com/");

  webview.setWebViewClient(new webViewClient(){
  @Override
    public void onReceivedError(WebView view, int errorCode, String description, String failingUrl){

      Log.e("Log", "errorCode: " + String.valueof(errorCode));
      Log.e("Log", "description: " + description);
      Log.e("Log", "failingUrl: " + +failingUrl);
    }
  });
}
}

</code>

^ErrorCode^^^
|int	| ERROR_AUTHENTICATION	| User authentication failed on server |
|int	| ERROR_BAD_URL	| Malformed URL |
|int	| ERROR_CONNECT	| Failed to connect to the server | 
|int	| ERROR_FAILED_SSL_HANDSHAKE	| Failed to perform SSL handshake | 
|int	| ERROR_FILE	| Generic file error |
|int	| ERROR_FILE_NOT_FOUND	| File not found |
|int	| ERROR_HOST_LOOKUP	| Server or proxy hostname lookup failed |
|int	| ERROR_IO	| Failed to read or write to the server |
|int	| ERROR_PROXY_AUTHENTICATION	| User authentication failed on proxy |
|int	| ERROR_REDIRECT_LOOP	| Too many redirects |
|int	| ERROR_TIMEOUT	| Connection timed out |
|int	| ERROR_TOO_MANY_REQUESTS	| Too many requests during this load |
|int	| ERROR_UNKNOWN	| Generic error |
|int	| ERROR_UNSUPPORTED_AUTH_SCHEME	| Unsupported authentication scheme (not basic or digest) |
|int	| ERROR_UNSUPPORTED_SCHEME	| Unsupported URI scheme |

===JavaScriptからコンソール出力====
JavaScriptのコンソール出力をLogcatに出す

ActivityでJavascriptを実行可に設定
<code java>
WebView webview =new WebView(this);
webview.getSettings().setJavaScriptEnabled(true);
setContentView(webview);

</code>
javascript内でconsole.logを

<code javascript>
<script>
  console.log('test!!');
</script>
</code>

===onConsoleMessageで出力===
端末によってはconsole.logが使えない場合があるみたいなのでこっちもあり。

[[http://developer.android.com/reference/android/webkit/WebChromeClient.html#onConsoleMessage(android.webkit.ConsoleMessage)|onConsoleMessage]]
<code java>
webview.setwebChromeClient(new WebChromeClient(){
  publicvoid onConsoleMessage(String message, int lineNunber, String sourceID){
    Log.d("message", message);
    Log.d("line", String.valueOf(lineNumber));
    Log.d("URL", sourceID);
  }
})
</code>