看板 KnucklesNote
作者 標題 [AndroidStudio] 使用 AsyncHttpClient 存取網路資料
時間 2016-02-14 Sun. 06:45:26
AsyncHttpClient 是一個在Android上用來存取網路的第三方函式庫
官網 http://loopj.com/android-async-http/
使用方法
在 build.gradle (Module: app) 的 dependencies { 裡加上
compile 'com.loopj.android:android-async-http:1.4.9'
使用到 Header 時需要
import cz.msebera.android.httpclient.Header;
要讀取 JSON 網頁時使用
String url = "http://disp.cc/api/board.php";
AsyncHttpClient client = new AsyncHttpClient();
RequestParams params = new RequestParams();
params.put("act", "blist");
params.put("limitNum", "5");
client.get(url, params, new JsonHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, Header[] headers, JSONObject response) {
// Root JSON in response is an dictionary i.e { "data : [...] }
// Handle resulting parsed JSON response here
if (response.optInt("isSuccess") != 1) {
Toast.makeText(mContext, "Error:" + response.optString("errorMessage"), Toast.LENGTH_LONG).show();
return;
}
JSONObject data = response.optJSONObject("data");
int totalNum = data.optInt("totalNum");
Log.d("test","totalNum: " + totalNum);
}
@Override
public void onFailure(int statusCode, Header[] headers, String res, Throwable t) {
// called when response HTTP status is "4XX" (eg. 401, 403, 404)
Toast.makeText(getApplicationContext(), "Error: " + statusCode + " " + e.getMessage(), Toast.LENGTH_LONG).show();
}
});
使用 GET 的方法傳送 act=blist 與 limitNum=5 兩項資料，AsyncHttpClient client = new AsyncHttpClient();
RequestParams params = new RequestParams();
params.put("act", "blist");
params.put("limitNum", "5");
client.get(url, params, new JsonHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, Header[] headers, JSONObject response) {
// Root JSON in response is an dictionary i.e { "data : [...] }
// Handle resulting parsed JSON response here
if (response.optInt("isSuccess") != 1) {
Toast.makeText(mContext, "Error:" + response.optString("errorMessage"), Toast.LENGTH_LONG).show();
return;
}
JSONObject data = response.optJSONObject("data");
int totalNum = data.optInt("totalNum");
Log.d("test","totalNum: " + totalNum);
}
@Override
public void onFailure(int statusCode, Header[] headers, String res, Throwable t) {
// called when response HTTP status is "4XX" (eg. 401, 403, 404)
Toast.makeText(getApplicationContext(), "Error: " + statusCode + " " + e.getMessage(), Toast.LENGTH_LONG).show();
}
});
也可以在網址 url 後加上 "?act=blist&limitNum=5" 就好
取得的 JSON 資料會像這樣: http://disp.cc/api/board.php?act=blist&limitNum=5
要使用 POST 的方法傳送資料的話，就把 client.get 改成 client.post
這樣 params 就會是用 POST 的方法來傳送
保存網頁Cookie
例如要做登入功能的話，使用
AsyncHttpClient client = new AsyncHttpClient();
PersistentCookieStore cookieStore = new PersistentCookieStore(this);
client.setCookieStore(cookieStore);
就會自動將網頁Cookie存到SharedPreferencesPersistentCookieStore cookieStore = new PersistentCookieStore(this);
client.setCookieStore(cookieStore);
關閉APP再打開也會保留著
但是這個儲存的 Cookie 和 WebView 使用的 Cookie 不相同
要把 PersistentCookieStore 儲存的值取出來
利用 CookieManager 轉存成 WebView 使用的 Cookie
PersistentCookieStore cookieStore = new PersistentCookieStore(this);
List<Cookie> cookies = cookieStore.getCookies();
CookieManager cookieManager = CookieManager.getInstance();
if (Build.VERSION.SDK_INT < 21) {
CookieSyncManager.createInstance(this); //API 21 前要執行這個才不會當掉
}
for (Cookie eachCookie : cookies) {
String cookieString = eachCookie.getName() + "=" + eachCookie.getValue();
cookieManager.setCookie("http://disp.cc", cookieString);
}
List<Cookie> cookies = cookieStore.getCookies();
CookieManager cookieManager = CookieManager.getInstance();
if (Build.VERSION.SDK_INT < 21) {
CookieSyncManager.createInstance(this); //API 21 前要執行這個才不會當掉
}
for (Cookie eachCookie : cookies) {
String cookieString = eachCookie.getName() + "=" + eachCookie.getValue();
cookieManager.setCookie("http://disp.cc", cookieString);
}
存取網路資料時加上「載入中...」的提示訊息
![[圖]](http://i.imgur.com/41DJEmq.png)
加上兩個成員函式
private void showLoadingDialog(String message){
if(message==null){
message = "載入中...";
}
if(mLoadingDialog==null){
mLoadingDialog = new ProgressDialog(this);
mLoadingDialog.setMessage(message);
}
mLoadingDialog.show();
}
private void dismissLoadingDialog(){
if(mLoadingDialog!=null) {
mLoadingDialog.dismiss();
}
}
if(message==null){
message = "載入中...";
}
if(mLoadingDialog==null){
mLoadingDialog = new ProgressDialog(this);
mLoadingDialog.setMessage(message);
}
mLoadingDialog.show();
}
private void dismissLoadingDialog(){
if(mLoadingDialog!=null) {
mLoadingDialog.dismiss();
}
}
加上類別的 onDestroy 事件，當程式結束前關掉載入中的訊息方塊
@Override
protected void onDestroy() {
dismissLoadingDialog();
super.onDestroy();
}
protected void onDestroy() {
dismissLoadingDialog();
super.onDestroy();
}
加進 AsyncHttpClent 的程式裡
String url = "http://disp.cc/api/board.php";
AsyncHttpClient client = new AsyncHttpClient();
RequestParams params = new RequestParams();
params.put("act", "blist");
params.put("limitNum", "5");
showLoadingDialog("載入中..."); //顯示載入中的訊息方塊
client.get(url, params, new JsonHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, Header[] headers, JSONObject response) {
dismissLoadingDialog(); //關閉載入中的訊息方塊
// Root JSON in response is an dictionary i.e { "data : [...] }
// Handle resulting parsed JSON response here
}
@Override
public void onFailure(int statusCode, Header[] headers, String res, Throwable t) {
dismissLoadingDialog(); //關閉載入中的訊息方塊
// called when response HTTP status is "4XX" (eg. 401, 403, 404)
}
});
AsyncHttpClient client = new AsyncHttpClient();
RequestParams params = new RequestParams();
params.put("act", "blist");
params.put("limitNum", "5");
showLoadingDialog("載入中..."); //顯示載入中的訊息方塊
client.get(url, params, new JsonHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, Header[] headers, JSONObject response) {
dismissLoadingDialog(); //關閉載入中的訊息方塊
// Root JSON in response is an dictionary i.e { "data : [...] }
// Handle resulting parsed JSON response here
}
@Override
public void onFailure(int statusCode, Header[] headers, String res, Throwable t) {
dismissLoadingDialog(); //關閉載入中的訊息方塊
// called when response HTTP status is "4XX" (eg. 401, 403, 404)
}
});
--
※ 作者: Knuckles 時間: 2016-02-14 06:45:26
※ 編輯: Knuckles 時間: 2017-01-09 19:59:02
※ 看板: KnucklesNote 文章推薦值: 0 目前人氣: 0 累積人氣: 1437
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