使用 MasterDetail Flow 中的新数据更新 RecyclerView
Update RecyclerView with new data in MasterDetail Flow
我正在为平板电脑开发一个移动应用程序，我使用 Android Studio 步骤添加了一个 Master/Detail 流程。我在 Master Detail 上方有一组 4 个按钮 select a "Product" 然后，当你点击其中一个时，RecyclerView 会更新数据。
我的问题是，如果您点击一个按钮（产品），然后点击另一个按钮，再点击另一个按钮，等等。所有数据都一起加载，所以我需要弄清楚如何 update/refresh RecyclerView。
在我的 RecyclerViewAdapter 中，我添加了一个方法来清除、更新 ITEMS，然后通知 DataSetChanged。这适用于其余按钮，但不适用于默认情况下以编程方式单击的第一个按钮。第一个按钮再次设置 RecyclerView。
ProductListActivity
public class ProductListActivity extends AppCompatActivity implements View.OnClickListener {
/**
* Whether or not the activity is in two-pane mode, i.e. running on a tablet
* device.
*/
private boolean mTwoPane;
// Group of buttons
private Button[] btn = new Button[4];
private Button btn_unfocus;
private int[] btn_id = {R.id.btn0, R.id.btn1, R.id.btn2, R.id.btn3};
private View recyclerView;
private ItemRecyclerViewAdapter mAdapter;
private MyDatabase mMyDatabase;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_product_list);
if (findViewById(R.id.product_detail_container) != null) {
// The detail container view will be present only in the
// large-screen layouts (res/values-w900dp).
// If this view is present, then the
// activity should be in two-pane mode.
mTwoPane = true;
}
mMyDatabase = Utils.getDatabase(ProductListActivity.this);
recyclerView = findViewById(R.id.product_list);
assert recyclerView != null;
// Initialize the button group
initButtonGroup();
}
private void initButtonGroup() {
for(int i = 0; i < btn.length; i++){
btn[i] = (Button) findViewById(btn_id[i]);
btn[i].setBackgroundColor(ContextCompat.getColor(this, R.color.customGreenDark));
btn[i].setTextColor(Color.WHITE);
btn[i].setOnClickListener(this);
}
btn_unfocus = btn[0];
// Set the first button clicked by default
btn[0].performClick();
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.btn0 :
setFocus(btn_unfocus, btn[0]);
List<Presentation.IdAndPresentationTuple> presentationList1 = mMyDatabase.presentationDao()
.getProductRepresentationsByName("Product 1");
// Set up for the first time
setupRecyclerView((RecyclerView) recyclerView, presentationList1);
mAdapter.updateData(presentationList1);
break;
case R.id.btn1:
setFocus(btn_unfocus, btn[1]);
List<Presentation.IdAndPresentationTuple> presentationList2 = mMyDatabase.presentationDao()
.getProductRepresentationsByName("Product 2");
// Update data
mAdapter.updateData(presentationList2);
break;
case R.id.btn2:
setFocus(btn_unfocus, btn[2]);
List<Presentation.IdAndPresentationTuple> presentationList3 = mMyDatabase.presentationDao()
.getProductRepresentationsByName("Product 3");
// Update data
mAdapter.updateData(presentationList3);
break;
}
}
private void setFocus(Button btn_unfocus, Button btn_focus){
btn_unfocus.setTextColor(Color.WHITE);
btn_unfocus.setTypeface(null, Typeface.NORMAL);
btn_unfocus.setBackgroundColor(ContextCompat.getColor(this, R.color.customGreenDark));
btn_focus.setTextColor(Color.BLACK);
btn_focus.setTypeface(null, Typeface.BOLD);
btn_focus.setBackground(getDrawable(R.drawable.button_border_yellow));
this.btn_unfocus = btn_focus;
}
private void setupRecyclerView(@NonNull RecyclerView recyclerView, List<Presentation.IdAndPresentationTuple> ITEMS) {
mAdapter = new ItemRecyclerViewAdapter(this, ITEMS, mTwoPane);
recyclerView.setHasFixedSize(true);
recyclerView.setAdapter(mAdapter);
recyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));
}
}
ItemRecyclerViewAdapter
public class ItemRecyclerViewAdapter extends RecyclerView.Adapter<ItemRecyclerViewAdapter.ViewHolder> {
private final ProductListActivity mParentActivity;
private final List<Presentation.IdAndPresentationTuple> mValues;
private final boolean mTwoPane;
ItemRecyclerViewAdapter(ProductListActivity parent,
List<Presentation.IdAndPresentationTuple> items,
boolean twoPane) {
mParentActivity = parent;
mValues = items;
mTwoPane = twoPane;
}
// My custom method to clear, update and notifyDataSetChanged
public void updateData(List<Presentation.IdAndPresentationTuple> items) {
mValues.clear();
mValues.addAll(items);
notifyDataSetChanged();
}
private final View.OnClickListener mOnClickListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
Presentation.IdAndPresentationTuple item = (Presentation.IdAndPresentationTuple) view.getTag();
if (mTwoPane) {
Bundle arguments = new Bundle();
// Send the id of the product to show
arguments.putString(ProductDetailFragment.ARG_ITEM_ID, String.valueOf(item.getId()));
ProductDetailFragment fragment = new ProductDetailFragment();
fragment.setArguments(arguments);
mParentActivity.getSupportFragmentManager().beginTransaction()
.replace(R.id.product_detail_container, fragment)
.commit();
} else {
Context context = view.getContext();
Intent intent = new Intent(context, ProductDetailActivity.class);
intent.putExtra(ProductDetailFragment.ARG_ITEM_ID, String.valueOf(item.getId()));
context.startActivity(intent);
}
}
};
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.product_list_content, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull final ViewHolder holder, int position) {
holder.mIdView.setText(String.valueOf(mValues.get(position).getId()));
holder.mRepresentationNameView.setText(mValues.get(position).getPresentationName());
holder.itemView.setTag(mValues.get(position));
holder.itemView.setOnClickListener(mOnClickListener);
}
@Override
public int getItemCount() {
return mValues.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
final TextView mIdView;
final TextView mRepresentationNameView;
ViewHolder(View view) {
super(view);
mIdView = (TextView) view.findViewById(R.id.id);
mRepresentationNameView = (TextView) view.findViewById(R.id.representationName);
}
}
}
我的目标是每次单击新按钮（产品）时 update/refresh RecyclerView 正确。
一切看起来都很好。只需进行以下更改：
您已经在以下位置设置了空数据的 recyclerView：
setupRecyclerView((RecyclerView) recyclerView, null);
因此，您无需在第一个按钮中再次设置它。
在您的适配器中，在方法 getItemCount()
中添加以下更改
@Override
public int getItemCount() {
如果（mValues==null）
return 0;
return mValues.size();
}
通过这段代码，您是在告诉适配器，在开始时，当 mValues 为 null 时，将不会显示任何数据。因此，项目计数设置为 0。
更新
- 不要以编程方式单击第一个按钮，仅在应用程序打开时显示一些数据。虽然没什么问题，但这不是一个好的编码习惯。
在 onCreate() 中，调用您的 setupRecyclerView() 以显示第一个按钮的数据。
更改如下：
ProductListActivity
public class ProductListActivity extends AppCompatActivity implements View.OnClickListener {
/**
* Whether or not the activity is in two-pane mode, i.e. running on a tablet
* device.
*/
private boolean mTwoPane;
// Group of buttons
private Button[] btn = new Button[4];
private Button btn_unfocus;
private int[] btn_id = {R.id.btn0, R.id.btn1, R.id.btn2, R.id.btn3};
private View recyclerView;
private ItemRecyclerViewAdapter mAdapter;
private MyDatabase mMyDatabase;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_product_list);
if (findViewById(R.id.product_detail_container) != null) {
// The detail container view will be present only in the
// large-screen layouts (res/values-w900dp).
// If this view is present, then the
// activity should be in two-pane mode.
mTwoPane = true;
}
mMyDatabase = Utils.getDatabase(ProductListActivity.this);
recyclerView = findViewById(R.id.product_list);
//Get the data that you want to display for the first time
List<Presentation.IdAndPresentationTuple> presentationList1 = mMyDatabase.presentationDao()
.getProductRepresentationsByName("Product 1");
// Set up recycler view for the first time
setupRecyclerView((RecyclerView) recyclerView, presentationList1);
mAdapter.updateData(presentationList1); //Call the update method
// Initialize the button group
initButtonGroup();
}
private void initButtonGroup() {
for(int i = 0; i < btn.length; i++){
btn[i] = (Button) findViewById(btn_id[i]);
btn[i].setBackgroundColor(ContextCompat.getColor(this, R.color.customGreenDark));
btn[i].setTextColor(Color.WHITE);
btn[i].setOnClickListener(this);
}
btn_unfocus = btn[0];
// Set the first button clicked by default
//btn[0].performClick(); //Don't perform manual click
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.btn0 :
setFocus(btn_unfocus, btn[0]);
List<Presentation.IdAndPresentationTuple> presentationList1 = mMyDatabase.presentationDao()
.getProductRepresentationsByName("Product 1");
mAdapter.updateData(presentationList1);
break;
case R.id.btn1:
setFocus(btn_unfocus, btn[1]);
List<Presentation.IdAndPresentationTuple> presentationList2 = mMyDatabase.presentationDao()
.getProductRepresentationsByName("Product 2");
// Update data
mAdapter.updateData(presentationList2);
break;
case R.id.btn2:
setFocus(btn_unfocus, btn[2]);
List<Presentation.IdAndPresentationTuple> presentationList3 = mMyDatabase.presentationDao()
.getProductRepresentationsByName("Product 3");
// Update data
mAdapter.updateData(presentationList3);
break;
}
}
private void setFocus(Button btn_unfocus, Button btn_focus){
btn_unfocus.setTextColor(Color.WHITE);
btn_unfocus.setTypeface(null, Typeface.NORMAL);
btn_unfocus.setBackgroundColor(ContextCompat.getColor(this, R.color.customGreenDark));
btn_focus.setTextColor(Color.BLACK);
btn_focus.setTypeface(null, Typeface.BOLD);
btn_focus.setBackground(getDrawable(R.drawable.button_border_yellow));
this.btn_unfocus = btn_focus;
}
private void setupRecyclerView(@NonNull RecyclerView recyclerView, List<Presentation.IdAndPresentationTuple> ITEMS)
{
if(recyclerView.getAdapter()==null)
{
//Set the Adapter for the first time only
mAdapter = new ItemRecyclerViewAdapter(this, null, mTwoPane);
recyclerView.setHasFixedSize(true);
recyclerView.setAdapter(mAdapter);
recyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));
}
}
}
ItemRecyclerViewAdapter
public class ItemRecyclerViewAdapter extends RecyclerView.Adapter<ItemRecyclerViewAdapter.ViewHolder> {
private final ProductListActivity mParentActivity;
private final List<Presentation.IdAndPresentationTuple> mValues;
private final boolean mTwoPane;
ItemRecyclerViewAdapter(ProductListActivity parent,
List<Presentation.IdAndPresentationTuple> items,
boolean twoPane) {
mParentActivity = parent;
mValues = items;
mTwoPane = twoPane;
}
// My custom method to clear, update and notifyDataSetChanged
public void updateData(List<Presentation.IdAndPresentationTuple> items)
{
if(items!=null)
{
mValues.clear();
mValues.addAll(items);
notifyDataSetChanged();
}
}
private final View.OnClickListener mOnClickListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
Presentation.IdAndPresentationTuple item = (Presentation.IdAndPresentationTuple) view.getTag();
if (mTwoPane) {
Bundle arguments = new Bundle();
// Send the id of the product to show
arguments.putString(ProductDetailFragment.ARG_ITEM_ID, String.valueOf(item.getId()));
ProductDetailFragment fragment = new ProductDetailFragment();
fragment.setArguments(arguments);
mParentActivity.getSupportFragmentManager().beginTransaction()
.replace(R.id.product_detail_container, fragment)
.commit();
} else {
Context context = view.getContext();
Intent intent = new Intent(context, ProductDetailActivity.class);
intent.putExtra(ProductDetailFragment.ARG_ITEM_ID, String.valueOf(item.getId()));
context.startActivity(intent);
}
}
};
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.product_list_content, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull final ViewHolder holder, int position) {
holder.mIdView.setText(String.valueOf(mValues.get(position).getId()));
holder.mRepresentationNameView.setText(mValues.get(position).getPresentationName());
holder.itemView.setTag(mValues.get(position));
holder.itemView.setOnClickListener(mOnClickListener);
}
@Override
public int getItemCount()
{
if(mValues==null)
{
return 0;
}
return mValues.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
final TextView mIdView;
final TextView mRepresentationNameView;
ViewHolder(View view) {
super(view);
mIdView = (TextView) view.findViewById(R.id.id);
mRepresentationNameView = (TextView) view.findViewById(R.id.representationName);
}
}
}
我正在为平板电脑开发一个移动应用程序，我使用 Android Studio 步骤添加了一个 Master/Detail 流程。我在 Master Detail 上方有一组 4 个按钮 select a "Product" 然后，当你点击其中一个时，RecyclerView 会更新数据。
我的问题是，如果您点击一个按钮（产品），然后点击另一个按钮，再点击另一个按钮，等等。所有数据都一起加载，所以我需要弄清楚如何 update/refresh RecyclerView。
在我的 RecyclerViewAdapter 中，我添加了一个方法来清除、更新 ITEMS，然后通知 DataSetChanged。这适用于其余按钮，但不适用于默认情况下以编程方式单击的第一个按钮。第一个按钮再次设置 RecyclerView。
ProductListActivity
public class ProductListActivity extends AppCompatActivity implements View.OnClickListener {
/**
* Whether or not the activity is in two-pane mode, i.e. running on a tablet
* device.
*/
private boolean mTwoPane;
// Group of buttons
private Button[] btn = new Button[4];
private Button btn_unfocus;
private int[] btn_id = {R.id.btn0, R.id.btn1, R.id.btn2, R.id.btn3};
private View recyclerView;
private ItemRecyclerViewAdapter mAdapter;
private MyDatabase mMyDatabase;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_product_list);
if (findViewById(R.id.product_detail_container) != null) {
// The detail container view will be present only in the
// large-screen layouts (res/values-w900dp).
// If this view is present, then the
// activity should be in two-pane mode.
mTwoPane = true;
}
mMyDatabase = Utils.getDatabase(ProductListActivity.this);
recyclerView = findViewById(R.id.product_list);
assert recyclerView != null;
// Initialize the button group
initButtonGroup();
}
private void initButtonGroup() {
for(int i = 0; i < btn.length; i++){
btn[i] = (Button) findViewById(btn_id[i]);
btn[i].setBackgroundColor(ContextCompat.getColor(this, R.color.customGreenDark));
btn[i].setTextColor(Color.WHITE);
btn[i].setOnClickListener(this);
}
btn_unfocus = btn[0];
// Set the first button clicked by default
btn[0].performClick();
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.btn0 :
setFocus(btn_unfocus, btn[0]);
List<Presentation.IdAndPresentationTuple> presentationList1 = mMyDatabase.presentationDao()
.getProductRepresentationsByName("Product 1");
// Set up for the first time
setupRecyclerView((RecyclerView) recyclerView, presentationList1);
mAdapter.updateData(presentationList1);
break;
case R.id.btn1:
setFocus(btn_unfocus, btn[1]);
List<Presentation.IdAndPresentationTuple> presentationList2 = mMyDatabase.presentationDao()
.getProductRepresentationsByName("Product 2");
// Update data
mAdapter.updateData(presentationList2);
break;
case R.id.btn2:
setFocus(btn_unfocus, btn[2]);
List<Presentation.IdAndPresentationTuple> presentationList3 = mMyDatabase.presentationDao()
.getProductRepresentationsByName("Product 3");
// Update data
mAdapter.updateData(presentationList3);
break;
}
}
private void setFocus(Button btn_unfocus, Button btn_focus){
btn_unfocus.setTextColor(Color.WHITE);
btn_unfocus.setTypeface(null, Typeface.NORMAL);
btn_unfocus.setBackgroundColor(ContextCompat.getColor(this, R.color.customGreenDark));
btn_focus.setTextColor(Color.BLACK);
btn_focus.setTypeface(null, Typeface.BOLD);
btn_focus.setBackground(getDrawable(R.drawable.button_border_yellow));
this.btn_unfocus = btn_focus;
}
private void setupRecyclerView(@NonNull RecyclerView recyclerView, List<Presentation.IdAndPresentationTuple> ITEMS) {
mAdapter = new ItemRecyclerViewAdapter(this, ITEMS, mTwoPane);
recyclerView.setHasFixedSize(true);
recyclerView.setAdapter(mAdapter);
recyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));
}
}
ItemRecyclerViewAdapter
public class ItemRecyclerViewAdapter extends RecyclerView.Adapter<ItemRecyclerViewAdapter.ViewHolder> {
private final ProductListActivity mParentActivity;
private final List<Presentation.IdAndPresentationTuple> mValues;
private final boolean mTwoPane;
ItemRecyclerViewAdapter(ProductListActivity parent,
List<Presentation.IdAndPresentationTuple> items,
boolean twoPane) {
mParentActivity = parent;
mValues = items;
mTwoPane = twoPane;
}
// My custom method to clear, update and notifyDataSetChanged
public void updateData(List<Presentation.IdAndPresentationTuple> items) {
mValues.clear();
mValues.addAll(items);
notifyDataSetChanged();
}
private final View.OnClickListener mOnClickListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
Presentation.IdAndPresentationTuple item = (Presentation.IdAndPresentationTuple) view.getTag();
if (mTwoPane) {
Bundle arguments = new Bundle();
// Send the id of the product to show
arguments.putString(ProductDetailFragment.ARG_ITEM_ID, String.valueOf(item.getId()));
ProductDetailFragment fragment = new ProductDetailFragment();
fragment.setArguments(arguments);
mParentActivity.getSupportFragmentManager().beginTransaction()
.replace(R.id.product_detail_container, fragment)
.commit();
} else {
Context context = view.getContext();
Intent intent = new Intent(context, ProductDetailActivity.class);
intent.putExtra(ProductDetailFragment.ARG_ITEM_ID, String.valueOf(item.getId()));
context.startActivity(intent);
}
}
};
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.product_list_content, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull final ViewHolder holder, int position) {
holder.mIdView.setText(String.valueOf(mValues.get(position).getId()));
holder.mRepresentationNameView.setText(mValues.get(position).getPresentationName());
holder.itemView.setTag(mValues.get(position));
holder.itemView.setOnClickListener(mOnClickListener);
}
@Override
public int getItemCount() {
return mValues.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
final TextView mIdView;
final TextView mRepresentationNameView;
ViewHolder(View view) {
super(view);
mIdView = (TextView) view.findViewById(R.id.id);
mRepresentationNameView = (TextView) view.findViewById(R.id.representationName);
}
}
}
我的目标是每次单击新按钮（产品）时 update/refresh RecyclerView 正确。
一切看起来都很好。只需进行以下更改：
您已经在以下位置设置了空数据的 recyclerView：
setupRecyclerView((RecyclerView) recyclerView, null);
因此，您无需在第一个按钮中再次设置它。
在您的适配器中，在方法 getItemCount()
中添加以下更改@Override public int getItemCount() { 如果（mValues==null） return 0;
return mValues.size(); }
通过这段代码，您是在告诉适配器，在开始时，当 mValues 为 null 时，将不会显示任何数据。因此，项目计数设置为 0。
更新
- 不要以编程方式单击第一个按钮，仅在应用程序打开时显示一些数据。虽然没什么问题，但这不是一个好的编码习惯。
在 onCreate() 中，调用您的 setupRecyclerView() 以显示第一个按钮的数据。
更改如下：
ProductListActivity
public class ProductListActivity extends AppCompatActivity implements View.OnClickListener {
/**
* Whether or not the activity is in two-pane mode, i.e. running on a tablet
* device.
*/
private boolean mTwoPane;
// Group of buttons
private Button[] btn = new Button[4];
private Button btn_unfocus;
private int[] btn_id = {R.id.btn0, R.id.btn1, R.id.btn2, R.id.btn3};
private View recyclerView;
private ItemRecyclerViewAdapter mAdapter;
private MyDatabase mMyDatabase;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_product_list);
if (findViewById(R.id.product_detail_container) != null) {
// The detail container view will be present only in the
// large-screen layouts (res/values-w900dp).
// If this view is present, then the
// activity should be in two-pane mode.
mTwoPane = true;
}
mMyDatabase = Utils.getDatabase(ProductListActivity.this);
recyclerView = findViewById(R.id.product_list);
//Get the data that you want to display for the first time
List<Presentation.IdAndPresentationTuple> presentationList1 = mMyDatabase.presentationDao()
.getProductRepresentationsByName("Product 1");
// Set up recycler view for the first time
setupRecyclerView((RecyclerView) recyclerView, presentationList1);
mAdapter.updateData(presentationList1); //Call the update method
// Initialize the button group
initButtonGroup();
}
private void initButtonGroup() {
for(int i = 0; i < btn.length; i++){
btn[i] = (Button) findViewById(btn_id[i]);
btn[i].setBackgroundColor(ContextCompat.getColor(this, R.color.customGreenDark));
btn[i].setTextColor(Color.WHITE);
btn[i].setOnClickListener(this);
}
btn_unfocus = btn[0];
// Set the first button clicked by default
//btn[0].performClick(); //Don't perform manual click
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.btn0 :
setFocus(btn_unfocus, btn[0]);
List<Presentation.IdAndPresentationTuple> presentationList1 = mMyDatabase.presentationDao()
.getProductRepresentationsByName("Product 1");
mAdapter.updateData(presentationList1);
break;
case R.id.btn1:
setFocus(btn_unfocus, btn[1]);
List<Presentation.IdAndPresentationTuple> presentationList2 = mMyDatabase.presentationDao()
.getProductRepresentationsByName("Product 2");
// Update data
mAdapter.updateData(presentationList2);
break;
case R.id.btn2:
setFocus(btn_unfocus, btn[2]);
List<Presentation.IdAndPresentationTuple> presentationList3 = mMyDatabase.presentationDao()
.getProductRepresentationsByName("Product 3");
// Update data
mAdapter.updateData(presentationList3);
break;
}
}
private void setFocus(Button btn_unfocus, Button btn_focus){
btn_unfocus.setTextColor(Color.WHITE);
btn_unfocus.setTypeface(null, Typeface.NORMAL);
btn_unfocus.setBackgroundColor(ContextCompat.getColor(this, R.color.customGreenDark));
btn_focus.setTextColor(Color.BLACK);
btn_focus.setTypeface(null, Typeface.BOLD);
btn_focus.setBackground(getDrawable(R.drawable.button_border_yellow));
this.btn_unfocus = btn_focus;
}
private void setupRecyclerView(@NonNull RecyclerView recyclerView, List<Presentation.IdAndPresentationTuple> ITEMS)
{
if(recyclerView.getAdapter()==null)
{
//Set the Adapter for the first time only
mAdapter = new ItemRecyclerViewAdapter(this, null, mTwoPane);
recyclerView.setHasFixedSize(true);
recyclerView.setAdapter(mAdapter);
recyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));
}
}
}
ItemRecyclerViewAdapter
public class ItemRecyclerViewAdapter extends RecyclerView.Adapter<ItemRecyclerViewAdapter.ViewHolder> {
private final ProductListActivity mParentActivity;
private final List<Presentation.IdAndPresentationTuple> mValues;
private final boolean mTwoPane;
ItemRecyclerViewAdapter(ProductListActivity parent,
List<Presentation.IdAndPresentationTuple> items,
boolean twoPane) {
mParentActivity = parent;
mValues = items;
mTwoPane = twoPane;
}
// My custom method to clear, update and notifyDataSetChanged
public void updateData(List<Presentation.IdAndPresentationTuple> items)
{
if(items!=null)
{
mValues.clear();
mValues.addAll(items);
notifyDataSetChanged();
}
}
private final View.OnClickListener mOnClickListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
Presentation.IdAndPresentationTuple item = (Presentation.IdAndPresentationTuple) view.getTag();
if (mTwoPane) {
Bundle arguments = new Bundle();
// Send the id of the product to show
arguments.putString(ProductDetailFragment.ARG_ITEM_ID, String.valueOf(item.getId()));
ProductDetailFragment fragment = new ProductDetailFragment();
fragment.setArguments(arguments);
mParentActivity.getSupportFragmentManager().beginTransaction()
.replace(R.id.product_detail_container, fragment)
.commit();
} else {
Context context = view.getContext();
Intent intent = new Intent(context, ProductDetailActivity.class);
intent.putExtra(ProductDetailFragment.ARG_ITEM_ID, String.valueOf(item.getId()));
context.startActivity(intent);
}
}
};
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.product_list_content, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull final ViewHolder holder, int position) {
holder.mIdView.setText(String.valueOf(mValues.get(position).getId()));
holder.mRepresentationNameView.setText(mValues.get(position).getPresentationName());
holder.itemView.setTag(mValues.get(position));
holder.itemView.setOnClickListener(mOnClickListener);
}
@Override
public int getItemCount()
{
if(mValues==null)
{
return 0;
}
return mValues.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
final TextView mIdView;
final TextView mRepresentationNameView;
ViewHolder(View view) {
super(view);
mIdView = (TextView) view.findViewById(R.id.id);
mRepresentationNameView = (TextView) view.findViewById(R.id.representationName);
}
}
}