我正在编写一个正确连接到Fitbit API的应用程序，并将我需要的数据拉回来。我有一个扩展AsyncTask的内部类，可以让我完成这个。例如，我的 MainActivity.java 会打开Fitbit OAuth2页面并且用户会登录。然后，用户将被定向回 UserActivity.java 并显示其信息。
我现在想要添加另一个Activity来回收他们执行的活动的信息。所以，我的问题是，我是否需要在 ActivitiesActivity.java 中添加另一个内部类，或者是否有其他方法来获取数据。我知道之前有人使用过界面，但我不确定它们是如何与AsyncTask一起使用的。
package com.jordan.fitbit_connect;
import android.net.Uri;
import android.os.Bundle;
import android.support.customtabs.CustomTabsIntent;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
String response_type = "token";
String client_id = "22CJH3";
String redirect_uri = "myapplication://login";
String scope = "activity%20nutrition%20heartrate%20location%20nutrition%20profile%20settings%20sleep%20social%20weight";
String url = "https://www.fitbit.com/oauth2/authorize?" + "response_type=" + response_type + "&client_id=" + client_id + "&redirect_uri=" + redirect_uri + "&scope=" + scope;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//
// CustomTabsIntent customTabsIntent = new CustomTabsIntent.Builder().build();
// customTabsIntent.launchUrl(this, Uri.parse(url));
connectToFitbit();
}
public void connectToFitbit()
{
Button btn = (Button)findViewById(R.id.btnConnect);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
CustomTabsIntent customTabsIntent = new CustomTabsIntent.Builder().build();
customTabsIntent.launchUrl(getApplicationContext(), Uri.parse(url));
}
});
}
}
package com.jordan.fitbit_connect;
import android.content.Intent;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.ImageView;
import android.widget.TextView;
import com.squareup.picasso.Picasso;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class TestActivity extends AppCompatActivity
{
//String to hold the data sent back by the Intent
String string;
//String to extract the token from 'string' above
private static String token;
//Strings to get the data from the JSON Object
public static String name, avatar, age, weight, height;
TextView username, txtAge, txtWeight, txtHeight, txtBMI;
float bmi;
ImageView imgViewAvatar;
//-------------------------------------- START onNewIntent()------------------------------------
/*
This method returns the URI from the Intent as an encoded String
*/
@Override
protected void onNewIntent(Intent intent)
{
string = intent.getDataString();
}
//-------------------------------------- END onNewIntent()--------------------------------------
//-------------------------------------- START onCreate()---------------------------------------
/*
Default method when the class is created
*/
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test);
onNewIntent(getIntent());
token = string.substring(string.indexOf("&access_token")+36,308);
Log.i("TAG", "Access Token: "+ token);
Log.i("TAG", "Data String: " + string);
//new JSONTask().execute("https://api.fitbit.com/1.2/user/-/sleep/date/2017-10-26.json");
//new JSONTask().execute("https://api.fitbit.com/1/user/-/activities/steps/date/today/6m.json");
new JSONTask().execute("https://api.fitbit.com/1/user/-/profile.json");
}
//-------------------------------------- END onCreate()-----------------------------------------
//-------------------------------------- START of inner class JSONTask -------------------------
public class JSONTask extends AsyncTask<String,String,String>
{
@Override
protected void onPreExecute() {
super.onPreExecute();
username = (TextView)findViewById(R.id.txtUser);
imgViewAvatar = (ImageView)findViewById(R.id.imgViewAvatar);
txtAge = (TextView)findViewById(R.id.txtAge);
txtWeight = (TextView) findViewById(R.id.txtWeight);
txtHeight = (TextView) findViewById(R.id.txtHeight);
txtBMI = (TextView) findViewById(R.id.txtBMI);
}
//-------------------------------------- START doInBackground()-----------------------------
/*
This method is what happens on the background thread when the
app is running. It will
*/
@Override
protected String doInBackground(String... params)
{
HttpURLConnection connection = null;
BufferedReader reader = null;
try
{
URL url = new URL(params[0]);
connection = (HttpURLConnection)url.openConnection();
connection.setRequestMethod("GET");
connection.setDoOutput(false);
connection.addRequestProperty("Authorization", "Bearer " + token);
connection.connect();
InputStream stream = (InputStream)connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
StringBuffer buffer = new StringBuffer();
String line = "";
while((line = reader.readLine()) !=null)
{
buffer.append(line);
}
return buffer.toString();
} catch (MalformedURLException e)
{
e.printStackTrace();
} catch (IOException e)
{
e.toString();
}
return null;
}
//-------------------------------------- END doInBackground()-------------------------------
//-------------------------------------- START onPostExecute()------------------------------
@Override
protected void onPostExecute(String data)
{
super.onPostExecute(data);
Log.i("TAG", data);
try
{
//GET ALL THE JSON DATA
JSONObject allData = new JSONObject(data);
//GET THE USERNAME
JSONObject userObject = allData.getJSONObject("user");
name = userObject.getString("fullName");
username.append(" "+name);
//GET THE USER'S AVATAR
avatar = userObject.getString("avatar640");
Picasso.get().load(avatar).into(imgViewAvatar);
//GET THE USER'S AGE
age = userObject.getString("age");
txtAge.append(" "+age);
weight = userObject.getString("weight");
txtWeight.append(" "+weight);
float weightFloat = Float.parseFloat(weight);
height = userObject.getString("height");
txtHeight.append(" "+height);
float heightFloat= Float.parseFloat(height)/100;
bmi = (float)(weightFloat/(heightFloat * heightFloat));
if(bmi <= 16)
{
txtBMI.setTextColor(Color.YELLOW);
txtBMI.append(" "+ String.valueOf(bmi) + " - You are severely underweight!");
}
else if(bmi <= 18.5)
{
txtBMI.setTextColor(Color.GRAY);
txtBMI.append(" "+ String.valueOf(bmi) + " - You are underweight!");
}
else if(bmi <= 25)
{
txtBMI.setTextColor(Color.GREEN);
txtBMI.append(" "+ String.valueOf(bmi) + " - Your weight is normal");
}
else if(bmi <= 30)
{
txtBMI.setTextColor(Color.parseColor("#FFA500"));
txtBMI.append(" "+ String.valueOf(bmi) + " - You are overweight!");
}
else
{
txtBMI.setTextColor(Color.RED);
txtBMI.append(" " + String.valueOf(bmi) + " - You are obese!");
}
// for(int i =0; i< userObject.length(); i++) {
//3.DECLARE ANOTHER JSONOBJECT THAT EXTRACTS THE OBECT FROM THE SPECIFIED ARRAY
//JSONObject sleep = sleepArray.getJSONObject(i);
//4.Then use a getString to get the data from the object
//name = userObject.getString("firstName");
// Log.i("TAG",name);
}
catch (JSONException e)
{
e.printStackTrace();
}
}
}
//-------------------------------------- END of inner class JSONTask ---------------------------
}
答案 0 :(得分：0)
在不同的Activity中使用AsynTask的方法之一，创建一个回调接口。
创建回调界面
interface AsyncTaskListener<T> {
public void onComplete(T result);
}
然后在您的 MainActivity 和 TestActivity中：
public class MainActivity extends AppCompatActivity
implements AsyncTaskListener<String> {
public void onComplete(String result) {
// your staff here
}
}
public class TestActivity extends AppCompatActivity
implements AsyncTaskListener<String> {
public void onComplete(String result) {
// your staff here
}
}
并添加到您的 AsyncTask 类：
public class JSONTask extends AsyncTask<String, String, String>
private AsyncTaskListener<String> listener;
public JSONTask (AsyncTaskListener<String> callback) {
this.listener = callback;
}
protected void onPostExecute(String result) {
listener.onComplete(result); // calling onComplate interface
}