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Updated our RecyclerView to handle onClick and empty view.

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This commit is contained in:
Dan Galpin
2015-05-25 03:04:38 -07:00
parent c4d1dffc5e
commit 8ccc514346
3 changed files with 54 additions and 36 deletions
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27
app/src/main/java/com/example/android/sunshine/app/ForecastAdapter.java
View File

@@ -17,15 +17,18 @@ package com.example.android.sunshine.app;
import android.content.Context;
import android.database.Cursor;
import android.os.Build;
import android.support.v4.view.ViewCompat;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Checkable;
import android.widget.ImageView;
import android.widget.TextView;
import com.bumptech.glide.Glide;
import com.example.android.sunshine.app.data.WeatherContract;
/**
* {@link ForecastAdapter} exposes a list of weather forecasts
@@ -41,11 +44,13 @@ public class ForecastAdapter extends RecyclerView.Adapter<ForecastAdapter.Foreca
private Cursor mCursor;
final private Context mContext;
final private ForecastAdapterOnClickHandler mClickHandler;
final private View mEmptyView;
/**
* Cache of the children views for a forecast list item.
*/
public class ForecastAdapterViewHolder extends RecyclerView.ViewHolder {
public class ForecastAdapterViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public final ImageView mIconView;
public final TextView mDateView;
public final TextView mDescriptionView;
@@ -59,11 +64,26 @@ public class ForecastAdapter extends RecyclerView.Adapter<ForecastAdapter.Foreca
mDescriptionView = (TextView) view.findViewById(R.id.list_item_forecast_textview);
mHighTempView = (TextView) view.findViewById(R.id.list_item_high_textview);
mLowTempView = (TextView) view.findViewById(R.id.list_item_low_textview);
view.setOnClickListener(this);
}
@Override
public void onClick(View v) {
int adapterPosition = getAdapterPosition();
mCursor.moveToPosition(adapterPosition);
int dateColumnIndex = mCursor.getColumnIndex(WeatherContract.WeatherEntry.COLUMN_DATE);
mClickHandler.onClick(mCursor.getLong(dateColumnIndex), this);
}
}
public ForecastAdapter(Context context) {
public static interface ForecastAdapterOnClickHandler {
void onClick(Long date, ForecastAdapterViewHolder vh);
}
public ForecastAdapter(Context context, ForecastAdapterOnClickHandler dh, View emptyView) {
mContext = context;
mClickHandler = dh;
mEmptyView = emptyView;
}
/*
@@ -92,7 +112,7 @@ public class ForecastAdapter extends RecyclerView.Adapter<ForecastAdapter.Foreca
view.setFocusable(true);
return new ForecastAdapterViewHolder(view);
} else {
throw new RuntimeException("Not bound to RecyclerViewSelection");
throw new RuntimeException("Not bound to RecyclerView");
}
}
@@ -170,6 +190,7 @@ public class ForecastAdapter extends RecyclerView.Adapter<ForecastAdapter.Foreca
public void swapCursor(Cursor newCursor) {
mCursor = newCursor;
notifyDataSetChanged();
mEmptyView.setVisibility(getItemCount() == 0 ? View.VISIBLE : View.GONE);
}
public Cursor getCursor() {

48
app/src/main/java/com/example/android/sunshine/app/ForecastFragment.java
View File

@@ -40,7 +40,7 @@ import com.example.android.sunshine.app.data.WeatherContract;
import com.example.android.sunshine.app.sync.SunshineSyncAdapter;
/**
* Encapsulates fetching the forecast and displaying it as a {@link RecyclerView} layout.
* Encapsulates fetching the forecast and displaying it as a {@link android.support.v7.widget.RecyclerView} layout.
*/
public class ForecastFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor>, SharedPreferences.OnSharedPreferenceChangeListener {
public static final String LOG_TAG = ForecastFragment.class.getSimpleName();
@@ -148,9 +148,6 @@ public class ForecastFragment extends Fragment implements LoaderManager.LoaderCa
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// The ForecastAdapter will take data from a source and
// use it to populate the RecyclerView it's attached to.
mForecastAdapter = new ForecastAdapter(getActivity());
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
@@ -159,26 +156,28 @@ public class ForecastFragment extends Fragment implements LoaderManager.LoaderCa
// Set the layout manager
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
// View emptyView = rootView.findViewById(R.id.recyclerview_forecast_empty);
View emptyView = rootView.findViewById(R.id.recyclerview_forecast_empty);
// use this setting to improve performance if you know that changes
// in content do not change the layout size of the RecyclerView
mRecyclerView.setHasFixedSize(true);
// The ForecastAdapter will take data from a source and
// use it to populate the RecyclerView it's attached to.
mForecastAdapter = new ForecastAdapter(getActivity(), new ForecastAdapter.ForecastAdapterOnClickHandler() {
@Override
public void onClick(Long date, ForecastAdapter.ForecastAdapterViewHolder vh) {
String locationSetting = Utility.getPreferredLocation(getActivity());
((Callback) getActivity())
.onItemSelected(WeatherContract.WeatherEntry.buildWeatherLocationWithDate(
locationSetting, date)
);
mPosition = vh.getAdapterPosition();
}
}, emptyView);
// specify an adapter (see also next example)
mRecyclerView.setAdapter(mForecastAdapter);
// We'll call our MainActivity
// mRecyclerView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
//
// @Override
// public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
// // CursorAdapter returns a cursor at the correct position for getItem(), or null
// // if it cannot seek to that position.
// Cursor cursor = (Cursor) adapterView.getItemAtPosition(position);
// if (cursor != null) {
// String locationSetting = Utility.getPreferredLocation(getActivity());
// ((Callback) getActivity())
// .onItemSelected(WeatherContract.WeatherEntry.buildWeatherLocationWithDate(
// locationSetting, cursor.getLong(COL_WEATHER_DATE)
// ));
// }
// mPosition = position;
// }
// });
// If there's instance state, mine it for useful information.
// The end-goal here is that the user never knows that turning their device sideways
@@ -235,7 +234,7 @@ public class ForecastFragment extends Fragment implements LoaderManager.LoaderCa
@Override
public void onSaveInstanceState(Bundle outState) {
// When tablets rotate, the currently selected list item needs to be saved.
// When no item is selected, mPosition will be set to RecyclerView.INVALID_POSITION,
// When no item is selected, mPosition will be set to RecyclerView.NO_POSITION,
// so check for that before storing.
if (mPosition != RecyclerView.NO_POSITION) {
outState.putInt(SELECTED_KEY, mPosition);
@@ -326,5 +325,4 @@ public class ForecastFragment extends Fragment implements LoaderManager.LoaderCa
updateEmptyView();
}
}
}

3
app/src/main/res/layout/fragment_main_base.xml
View File

@@ -23,8 +23,7 @@
style="@style/ForecastListStyle"
android:id="@+id/recyclerview_forecast"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:divider="@null" />
android:layout_height="match_parent"/>
<!-- empty list -->
<TextView
android:id="@+id/recyclerview_forecast_empty"