使用JsonObjectRequest獲取一個json對象:
String url = "http://server.domain/json_object.do";
JsonObjectRequest request = new JsonObjectRequest(url, null, new Listener<JSONObject>() {
@Override
public void onSuccess(JSONObject response) {
Toast.makeText(Activity.this, response.getString("result"), 2000).show();
}
@Override
public void onError(NetroidError error) {
Toast.makeText(Activity.this, "error occurred : " + error.getMessage(), 2000).show();
}
});
// 設置請求標識,這個標識可用於終止該請求時傳入的Key
request.setTag("json-request");
RequestQueue.add(request);
使用JsonArrayRequest獲取一個json對象列表:
String url = "http://server.domain/json_array.do";
JsonArrayRequest request = new JsonArrayRequest(url, new Listener<JSONArray>() {
@Override
public void onSuccess(JSONArray response) {
Toast.makeText(Activity.this, "JSONArray length : " + response.length(), 2000).show();
}
@Override
public void onError(NetroidError error) {
Toast.makeText(Activity.this, "error occurred : " + error.getMessage(), 2000).show();
}
});
// 忽略請求的硬盤緩存,直接執行Http操作
request.setForceUpdate(true);
// Http操作成功後保存進緩存的過期時間
request.setCacheExpireTime(TimeUnit.MINUTES, 10);
RequestQueue.add(request);
使用StringRequest獲取一個字符串結果:
String url = "http://server.domain/string.do";
StringRequest request = new StringRequest(Request.Method.GET, url, new Listener<String>() {
@Override
public void onSuccess(String response) {
Toast.makeText(Activity.this, "response : " + response, 2000).show();
}
@Override
public void onError(NetroidError error) {
Toast.makeText(Activity.this, "error occurred : " + error.getMessage(), 2000).show();
}
});
// 設置請求Header
request.addHeader("Accept-Encoding", "gzip, deflate");
RequestQueue.add(request);
使用ImageRequest獲取一張圖片:
String url = "http://server.domain/sample.jpg";
ImageRequest request = new ImageRequest(url, new Listener<Bitmap>() {
@Override
public void onSuccess(Bitmap response) {
ImageView.setImageBitmap(response);
}
@Override
public void onError(NetroidError error) {
Toast.makeText(Activity.this, "error occurred : " + error.getMessage(), 2000).show();
}
}, ImageView.getWidth(), ImageView.getHeight(), Bitmap.Config.RGB_565);
// 設置返回結果在硬盤緩存中的過期時間爲10天
request.setCacheExpireTime(TimeUnit.DAYS, 10);
RequestQueue.add(request);
注:不建議直接使用ImageRequest,推薦使用 ImageLoader 來加載圖片。
使用Netroid,你的所有Http操作代碼都將類似於這樣的書寫方式。