Android中webview监控页面卡死

由于webview在加载页面过程中或者加载完成后，页面可能会出现卡顿或崩溃的情况，此时程序后台是感知不到的，需要通过程序手段监测出来。

因此采取页面上定时发送心跳到webview后端，后端通过监测心跳来判断页面有没有死掉的情况。

一、先编写java相关文件HeartJavaScriptFunction.java，用于向js提供调用的接口函数：

public interface HeartJavaScriptFunction {

 void onJsFunctionCalled(int tag);
}

二、编写CrashMonitor.java，用来判断页面心跳：

import java.util.Date;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class CrashMonitor {
 private ScheduledExecutorService  executorService  = null;
 private long oldpos = 0;
 private int pauseNum = 0;
 private OnCrashedListener onCrashedListener;
    public interface OnCrashedListener {
        void onCrashed();
    }
    public void setOnCrashedListener(OnCrashedListener listener) {
        onCrashedListener = listener;
    }
    public boolean isWorking(){
     boolean res = false;
     if(executorService != null){
      res = true;
     }
     return res;
    }
    public void updateTimer(long pos){
     oldpos = pos;
    }
    public void monitorPageCrashed(final int period){
  executorService  = Executors.newScheduledThreadPool(1);
     executorService.scheduleAtFixedRate(  
                new Runnable() {  
                    @Override  
                    public void run() {
                     if(oldpos > 0 && (new Date().getTime() - oldpos) > 1 * 60 * 1000){
                      pauseNum ++;
                     }
                     if(pauseNum >= 3){
                      oldpos = 0;
                      executorService.shutdown();
                      //do something
                      if(onCrashedListener != null){
                       onCrashedListener.onCrashed();
                      }
                         return;
                     }
                    }  
                },0,period, TimeUnit.MILLISECONDS);  
    }
}

三、webview调用监听程序：

  mWebView.addJavascriptInterface(new HeartJavaScriptFunction() {

   @Override
   public void onJsFunctionCalled(int tag) {
    // TODO Auto-generated method stub
    if(crashMonitor != null){
     crashMonitor.updateTimer(new Date().getTime());
     if(!crashMonitor.isWorking()){
      crashMonitor.monitorPageCrashed(tag);
     }
    }
   }
  }, "Android");
  crashMonitor.setOnCrashedListener(new CrashMonitor.OnCrashedListener() {

   @Override
   public void onCrashed() {
    // TODO Auto-generated method stub
    //页面卡死了
   }
  });

四、页面通过js定时发送心跳：

<script type="text/javascript">
  var intv = 10 * 1000;
  setInterval(function () {
   if(typeof Android != "undefined"){
    Android.onJsFunctionCalled(intv);
   }
  }, intv);
 </script>

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