How do I put the Loader, onLoadFinish, and onLoadReset into "public void onClick(View view) {"
This is the Code I have in my main activity I need to put my loader that is in the oncreate section into my onclicklistener.
I put the init loader in a public class called "load" and was able to call that, but the other public classes I am having a hard time putting in my onclicklistener.
Any help would be appreciated.
package com.example.android.googlebooks;
import android.app.LoaderManager;
import android.content.Context;
import android.content.Intent;
import android.content.Loader;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class BooksActivity extends AppCompatActivity
implements LoaderManager.LoaderCallbacks<List<Books>> {
private static final String LOG_TAG = BooksActivity.class.getName();
/**
* URL for books data from the USGS dataset
*/
private static String GOOGLEBOOKS_REQUEST_URL =
"https://www.googleapis.com/books/v1/volumes?q=";
/**
* Constant value for the book loader ID. We can choose any integer.
* This really only comes into play if you're using multiple loaders.
*/
private static final int BOOKS_LOADER_ID = 1;
/**
* Adapter for the list of books
*/
private BookAdapter mAdapter;
/** TextView that is displayed when the list is empty */
/**
* TextView that is displayed when the list is empty
*/
private TextView mEmptyStateTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.i(LOG_TAG, "TEST: Book Activity onCreate() called");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_books);
Button mButton = (Button) findViewById(R.id.button);
EditText mEdit = (EditText) findViewById(R.id.editText);
assert mEdit != null;
final Editable mEditText = mEdit.getText();
assert mButton != null;
mButton.setOnClickListener(
new View.OnClickListener() {
public void onClick(View view) {
GOOGLEBOOKS_REQUEST_URL = "https://www.googleapis.com/books/v1/volumes?q=" + mEditText;
load();
Toast.makeText(getApplicationContext(),
GOOGLEBOOKS_REQUEST_URL, Toast.LENGTH_LONG).show();
}
});
mEmptyStateTextView = (TextView) findViewById(R.id.empty_view);
// Find a reference to the {@link ListView} in the layout
ListView bookListView = (ListView) findViewById(R.id.list);
// Create a new adapter that takes an empty list of books as input
mAdapter = new BookAdapter(this, new ArrayList<Books>());
// Set the adapter on the {@link ListView}
// so the list can be populated in the user interface
bookListView.setAdapter(mAdapter);
bookListView.setEmptyView(mEmptyStateTextView);
// Set an item click listener on the ListView, which sends an intent to a web browser
// to open a website with more information about the selected books.
bookListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
// Find the current Books that were clicked on
Books currentBooks = mAdapter.getItem(position);
// Convert the String URL into a URI object (to pass into the Intent constructor)
Uri bookUri = Uri.parse(currentBooks.getmUrl());
// Create a new intent to view the books URI
Intent websiteIntent = new Intent(Intent.ACTION_VIEW, bookUri);
// Send the intent to launch a new activity
startActivity(websiteIntent);
}
});}
public void load() {
// Get a reference to the ConnectivityManager to check state of network connectivity
ConnectivityManager connMgr = (ConnectivityManager)
getSystemService(Context.CONNECTIVITY_SERVICE);
// Get details on the currently active default data network
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
// If there is a network connection, fetch data
if (networkInfo != null && networkInfo.isConnected()) {
// Get a reference to the LoaderManager, in order to interact with loaders.
LoaderManager loaderManager = getLoaderManager();
// Initialize the loader. Pass in the int ID constant defined above and pass in null for
// the bundle. Pass in this activity for the LoaderCallbacks parameter (which is valid
// because this activity implements the LoaderCallbacks interface).
loaderManager.initLoader(BOOKS_LOADER_ID, null, this);
} else {
// Otherwise, display error
// First, hide loading indicator so error message will be visible
View loadingIndicator = findViewById(R.id.loading_spinner);
loadingIndicator.setVisibility(View.GONE);
// Update empty state with no connection error message
mEmptyStateTextView.setText(R.string.no_internet_connection);
new BooksLoader(this, GOOGLEBOOKS_REQUEST_URL);
}
}
public Loader<List<Books>> onCreateLoader(int i, Bundle bundle) {
Log.i(LOG_TAG, "TEST: Book Activity Loader,list,books called");
return new BooksLoader(this, GOOGLEBOOKS_REQUEST_URL);
}
public void onLoadFinished(Loader<List<Books>> loader, List<Books> book) {
ProgressBar info = (ProgressBar) findViewById(R.id.loading_spinner);
assert info != null;
info.setVisibility(View.GONE);
// Set empty state text to display "No Books found."
mEmptyStateTextView.setText(R.string.no_books);
Log.i(LOG_TAG, "TEST: Books Activity onLoadFinished() called");
// Clear the adapter of previous book data
mAdapter.clear();
// If there is a valid list of {@link Books}s, then add them to the adapter's
// data set. This will trigger the ListView to update.
if (book != null && !book.isEmpty()) {
mAdapter.addAll(book);
}
}
@Override
public void onLoaderReset(Loader<List<Books>> loader) {
Log.i(LOG_TAG, "TEST: Books Activity onLoaderReset() called");
// Loader reset, so we can clear out our existing data.
mAdapter.clear();
}
}
