android WebView：处理JavaScript中的箭头键

Question

我有一个简单的WebView应用程序，我想用键盘控制。 是否有可能在javascript中捕获箭头键？

我曾尝试下面的代码没有任何的运气：

function handleArrowKeys(evt) { 
    console.info('key');                       
} 

document.onkeyup = handleArrowKeys; 
document.onkedown = handleArrowKeys; 
document.onkepress = handleArrowKeys; 

JavaScript在web视图

WebSettings webSettings = webview.getSettings(); 
webSettings.setJavaScriptEnabled(true); 
webSettings.setDomStorageEnabled(true); 

Answer 1

您应该覆盖的WebView的onKeyDown方法启用。 见：http://blog.csdn.net/focusxi/article/details/6780965

@Override 
public boolean onKeyDown(int keyCode, KeyEvent event){ 
    int valKey = 0; 
    System.out.println("Web KEY:"); 
    System.out.println(keyCode);  

    switch(keyCode){ 
     //UP 
     case 50: 
     case 19: 
      valKey = 19; 
      break; 
     //DOWN 
     case 83: 
     case 20: 
      valKey = 20;   
      break; 
     //LEFT 
     case 81: 
     case 21: 
      valKey = 21; 
      break; 
     //RIGHT 
     case 69: 
     case 22: 
      valKey = 22;  
      break; 
    } 

    if (valKey!=0) 
    { 
     //new KeyEvent(KeyEvent.ACTION_DOWN,KeyEvent.KEYCODE_SHIFT_LEFT); 
     KeyEvent event1 = new KeyEvent(KeyEvent.ACTION_DOWN, valKey); 

     System.out.println(event1.getKeyCode());  

     return super.onKeyDown(38, event1); 
    } 
    else 
    { 
     return super.onKeyDown(keyCode, event); 
    } 

} 
}