所有优秀的开发者，我不是，因为我发布了这个问题; - ）
我有一个包含待办事项列表的网站，您可以登录Google。现在我想制作一个Android应用程序来访问我网站上的数据库。我已登录Google部分正确并从该登录活动中切换到活动（通过意图，我知道我是如何正确登录的，导致意图仅在登录时启动）显示我的待办事项列表。这就是我被困的地方。我似乎无法从数据库中获取数据，即使我已登录。我在网上搜索了一下（观看了几个小时关于该主题的YouTube视频，还搜索了StackOverflow，互联网一般和谷歌开发者页面），但没有结果。我猜我必须将登记活动中的令牌传递给另一个，但除此之外，我只是不知道，我希望你们中的某个人可以指出我在右边方向。额外信息：站点用PHP编写，PDO用于DB函数和MySQL DB。我还设法在网站上获得JSON输出。在Android应用程序中，我也使用Volley，它是用Java编写的（不是Kotlin）。我非常感谢您的帮助，如果您需要更多信息（或者可能是代码的一部分），请务必询问。
此致
克里斯托弗
编辑：特此请求的代码： LoginActivity：
package package_name;
some imports...
public class LoginActivity extends AppCompatActivity {
private static final String TAG = "Scorpio To Do Login: ";
GoogleSignInOptions gso;
GoogleSignInClient mGoogleSignInClient;
SignInButton signInButton;
private int RC_SIGN_IN = 6;
private static final String URL_DATA = "https://some.url.be";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
// Configure sign-in to request the user's ID, email address, and basic
// profile. ID and basic profile are included in DEFAULT_SIGN_IN.
gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken(getString(R.string.server_client_id))
.requestEmail()
.build();
// Build a GoogleSignInClient with the options specified by gso.
mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
}
@Override
protected void onStart() {
super.onStart();
// Check for existing Google Sign In account, if the user is already signed in
// the GoogleSignInAccount will be non-null.
GoogleSignInAccount account = GoogleSignIn.getLastSignedInAccount(this);
updateUI(account);
}
private void updateUI(GoogleSignInAccount account) {
Log.w(TAG, "account = " + account);
if(account == null){
// Set the dimensions of the sign-in button.
signInButton = findViewById(R.id.sign_in_button);
signInButton.setSize(SignInButton.SIZE_WIDE);
signInButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
signIn();
}
});
signInButton.setVisibility(View.VISIBLE);
} else {
Context context = LoginActivity.this;
/* This is the class that we want to start (and open) when the button is clicked. */
Class destinationActivity = TaskActivity.class;
/*
* Here, we create the Intent that will start the Activity we specified above in
* the destinationActivity variable. The constructor for an Intent also requires a
* context, which we stored in the variable named "context".
*/
Intent startChildActivityIntent = new Intent(context, destinationActivity);
/*
* Once the Intent has been created, we can use Activity's method, "startActivity"
* to start the ChildActivity.
*/
startActivity(startChildActivityIntent);
}
}
private void signIn() {
Intent signInIntent = mGoogleSignInClient.getSignInIntent();
startActivityForResult(signInIntent, RC_SIGN_IN);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// Result returned from launching the Intent from GoogleSignInClient.getSignInIntent(...);
if (requestCode == RC_SIGN_IN) {
// The Task returned from this call is always completed, no need to attach
// a listener.
Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
handleSignInResult(task);
}
}
private void handleSignInResult(Task<GoogleSignInAccount> completedTask) {
try {
GoogleSignInAccount account = completedTask.getResult(ApiException.class);
String idToken = account.getIdToken();
Log.d("Token: ", idToken);
// Signed in successfully, show authenticated UI.
updateUI(account);
} catch (ApiException e) {
// The ApiException status code indicates the detailed failure reason.
// Please refer to the GoogleSignInStatusCodes class reference for more information.
Log.w(TAG, "signInResult:failed code=" + e.getStatusCode());
updateUI(null);
}
}
}
TaskActivity：
package package_name;
some imports...
public class TaskActivity extends AppCompatActivity {
private static final String URL_DATA = "https://some.url.be";
private RecyclerView recyclerView;
private RecyclerView.Adapter scorpioAdapter;
private List<ListItem> listItems;
String JSON_STRING;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_task);
recyclerView = findViewById(R.id.rv);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
listItems = new ArrayList<>();
}
/*REAL DATA*/
/*try instead of loadRecyclerViewData*/
public void getJSON(View view){
new BackgroundTask().execute();
}
/*end try*/
private void loadRecyclerViewData() {
final ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Loading data...");
progressDialog.show();
StringRequest stringRequest = new StringRequest(Request.Method.GET,
URL_DATA,
new Response.Listener<String>() {
@Override
public void onResponse(String s) {
progressDialog.dismiss();
try {
JSONArray jsonArray = new JSONArray(s);
for(int i=0;i<jsonArray.length();i++){
JSONObject o = jsonArray.getJSONObject(i);
int id = o.getInt("id");
String name = o.getString("name");
int done = o.getInt("done");
String reminderDate = o.getString("reminderdate");
String reminderTime = o.getString("remindertime");
ListItem item = new ListItem(id, name, done, reminderDate, reminderTime);
listItems.add(item);
}
scorpioAdapter = new ScorpioAdapter(listItems, getApplicationContext());
recyclerView.setAdapter(scorpioAdapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
Toast.makeText(getApplicationContext(), volleyError.getMessage(), Toast.LENGTH_LONG).show();
}
}
);
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
/*END REAL DATA*/
/* things I tried*/
class BackgroundTask extends AsyncTask<Void, Void, String> {
String json_url;
@Override
protected void onPreExecute() {
json_url = "https://some.url.be";
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(String result) {
Log.i("Scorpio To Do: ", result);
TextView name = (TextView) findViewById(R.id.name);
name.setText(result);
}
@Override
protected String doInBackground(Void... voids) {
try {
URL url = new URL(json_url);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder stringBuilder = new StringBuilder();
while ((JSON_STRING = bufferedReader.readLine()) != null){
stringBuilder.append(JSON_STRING + "\n");
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return stringBuilder.toString().trim();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
/*end try*/
}