Android中webview监控页面卡死

原文地址为： 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：

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