Android中Okhttp进行get和post提交及数据请求的基本使用

编写不易，如有转载，请声明出处：http://blog.youkuaiyun.com/zxc514257857/article/details/60501821

get方式异步请求数据

String url = Url.IPA+ "/" + Url.IPB;
Request request = new Request.Builder()
        .url(url)
        .build();
OkHttpClient client = new OkHttpClient();
client.newCall(request).enqueue(new Callback() {
    @Override
    public void onFailure(Request request, IOException e) {
        Log.i(TAG, "网络请求失败");
    }

    @Override
    public void onResponse(Response response) throws IOException {
        if (response.isSuccessful()) {
            String jsonString = response.body().string();
            Gson gson = new Gson();
            mMarketList = gson.fromJson(jsonString,
                    new TypeToken<List<MarketBean>>() {
                    }.getType());
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    mListView.setAdapter(mMarketListAdapter);
                }
            });
        }
    }
});
-------------------------------------------------------
//请求到数据后在ListVIew里面显示
private MarketListAdapter mMarketListAdapter = new MarketListAdapter();
class MarketListAdapter extends BaseAdapter {
    @Override
    public int getCount() {
        if (mMarketList != null) {
            return mMarketList.size();
        }
        return 0;
    }
    @Override
    public Object getItem(int position) {
        if (mMarketList != null) {
            return mMarketList.get(position);
        }
        return null;
    }
    @Override
    public long getItemId(int position) {
        return position;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            convertView = View.inflate(SecondActivity.this, R.layout.id_item, null);
            holder = new ViewHolder(convertView);
            holder.mTextView = (TextView) convertView.findViewById(textView);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        if (mMarketList != null && holder != null) {
            String mName = mMarketList.get(position).name;
            String mId = mMarketList.get(position).id;      
            holder.mTextView.setText(name + ":" + id);
        }
        return convertView;
    }

    class ViewHolder {
        TextView mTextView;
    }
}

post方式同步提交表单数据（键值对数据）

String url = Url.IPA+ "/" + Url.IPB;
RequestBody formBody = new FormEncodingBuilder()
        .add("id", mId)
        .add("name", mName)        .
        .build();
Request request = new Request.Builder()
        .url(url)
        .post(formBody)
        .build();
try {
    Response response = client.newCall(request).execute();
    if (response.isSuccessful()) {
        Log.i("success",response.body().string());
    } else {
        throw new IOException("Unexpected code " + response);
    }
} catch (IOException e) {
    e.printStackTrace();
}

注意

• 进行网络访问前一定要先添加网络访问权限
• 在进行数据请求或数据提交时先看清接口文档中给的Url，在浏览器上看一下网址请求出来的Json数据是什么格式的，带callBack的要用字符串的形式截取掉callBack｛｝然后再进行请求
• 如果是请求数据，需要创建Bean类，可以通过GsonFormat插件进行快速创建，并可以通过导入Gson库进行快速解析数据
• 如果使用Okhttp这个网络请求工具采用jar包的形式的话，需要导入两个jar包，除了Okhttp.jar之外，还要导入OkIo.jar

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