OKHttp 同步请求

一般在UI线程（主线程）中调用网络请求不可取，但有时候也会用到，比如更新UI（应该还有更好的解决办法） 

此篇仅以记录 OKHttp 同步请求：

private Handler requestHandler_post = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        switch (msg.what) {
            case 1:
		Toast.makeText(Mine1Activity.this, "Successful", Toast.LENGTH_SHORT).show();
                break;            

	    case 0:
		Toast.makeText(Mine1Activity.this, "Fail", Toast.LENGTH_SHORT).show();
                break;           

	    default:                

		super.handleMessage(msg);        

	}    

    }};

new Thread(new Runnable() {
    @Override
    public void run() {
    	Message msg = requestHandler_post.obtainMessage();
		try {
        		OkHttpClient client = new OkHttpClient();
        		Request request = new Request.Builder()
        			.url(Url)  //Url为要请求的网络连接
        			.build();

        		Response response = client.newCall(request).execute();

        		if (!response.isSuccessful()) {
        			msg.what = 0;
       			 } else {
        			JSONObject jsonObject = new JSONObject(response.body().string());
        			String jsondata = jsonObject.getString("json");
        			Log.i("retpost",jsondata);
       				 //这里获得的返回数据可以在主线程中做进一步使用
        			msg.what = 1;
        		}
        	} catch (Exception ex) {
        		msg.what = 0;
       	        } finally {
        		msg.sendToTarget();
        	}
   	    }	}).start();