我创建了两个 xml 文件来表示两行:laptops_holder 和 console_holder.xml。 这些将用来自两个对话框 DIALOG_A 和 DIALOG_B 的数据进行扩充。 从这些对话框中，数据将保存到 sqlDatabase 但在不同的表下。 TABLE_LAPTOPS 和 TABLE_CONSOLES。 我有一行显示由笔记本电脑支架中的 DIALOG_A 提供的信息... 第二行是显示来自 DIALOG_B(到 console_holder.xml)的信息，但是当我单击 | 时应用程序崩溃了btn_save_d_console | btn_save_d_console |在(DIALOG_B)中。
我看了这个。 http://www.androidwarriors.com/2016/02/android-sqlite-database-tutorial-sqlite.html和 http://androidheight.blogspot.ug/?m=1 。想要更多但没有运气..
这是我尝试过的... MyMainActivity.java
public class MyMainActivity extends AppCompatActivity {
private final ArrayList<entry> mainEntries = new ArrayList<>();
DBAdapter db ;
RecyclerView rview;
RVAdapter adapter;
private EditText laptop_name, l_cost;
private EditText console_nme, c_cost;
Button btn_save_d;
Button btn_retrive_d;
@Override
protected void onPause() {
super.onPause( );
getLaptopsEntries( );
getConsolesEntries( );
}
//onCreate
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.my_main_activity);
//changed the fabs to buttons
Button open_dialog_a = (Button)findViewById(R.id.dialog_a);
Button open_dialog_b = (Button) findViewById(R.id.fab_dialog_b);
rview = (RecyclerView) findViewById(R.id.rv) ;
if (rview != null) {
rview.setHasFixedSize(true);
}
LinearLayoutManager layoutManager = new LinearLayoutManager(this,
OrientationHelper.VERTICAL, false);
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
rview.setLayoutManager(layoutManager);
rview.setItemAnimator(new DefaultItemAnimator());
adapter = new RVAdapter(this, mainEntries);
rview.setAdapter(adapter);
getLaptopsEntries( );
getConsolesEntries( );
if (open_dialog_b != null) {
open_dialog_b.setOnClickListener(new View.OnClickListener( ) {
@Override
public void onClick(View v) {
open_Dailog_B();
}
});
}
if (open_dialog_a != null) {
open_dialog_a.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
open_Dailog_A();
}
});
}
private void open_Dailog_A() {
Dialog d = new Dialog(this);
d.setTitle(" LAPTOPS ");
d.setContentView(R.layout.mylaptops);
laptop_name = (EditText) d.findViewById(R.id.lpname);
laptop_cost = (EditText) d.findViewById(R.id.lpcost);
btn_save_laptop = (Button) d.findViewById(R.id.btn_save_laptop);
btn_retrive_laptop = (Button)
d.findViewById(R.id.btn_retrive_laptop);
btn_save_laptop.setOnClickListener(new View.OnClickListener( ) {
@Override
public void onClick(View v) {
save_laptops(laptop_name.getText( ).toString( ).trim( ),
laptop_cost.getText( ).toString( ).trim( ));
}
});
//retrive laptop entries
btn_retrive_laptop.setOnClickListener(new View.OnClickListener( ) {
@Override
public void onClick(View v) {
getLaptopEntries( );
}
});
d.show();
}
private void save_laptops(String laptop, String cost) {
DBAdapter db = new DBAdapter(this);
db.openDB( );
//laptop and cost objects are from our dbAdapter
if (db.insert_Laptops(laptop, cost)) {
laptop_name.setText("");
laptop_cost.setText("");
Snackbar.make(entry_one, "saved ", Snackbar.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "error saving cash entries",
Toast.LENGTH_SHORT).show( );
}
db.closeDB( );
}
public void getLaptopsEntries( ) {
mainEntries.clear( );
db = new DBAdapter(this);
db.openDB( );
Cursor c = db.retrieve( );
while (c.moveToNext( )) {
int id = c.getInt(0);
String laptop = c.getString(1);
String cost = c.getString(2);
DateFormat dateFormat =
java.text.SimpleDateFormat.getDateTimeInstance( );
String time =
dateFormat.format
(new
Date(c.getLong(c.getColumnIndex(Constants.DATE_NAME))).getTime( ));
//entry is our pojo with all setters and getters needed
entry laptops = new entry();
laptops.setLaptopName(laptop);
laptops.setLaptopCost(cost);
laptops.setTime_date(time);
laptops.setId(id);
laptops.add(laptops);
}
db.closeDB( );
if (!(mainEntries.size( ) > 0)) {
rview.setAdapter(adapter); //
}
}
private void open_Dailog_B(){
Dialog console_dialog = new Dialog(this);
console_dialog.setTitle("Console sales entry");
console_dialog.setContentView(R.layout.consoles_dialog);
entry_one_exp =
(EditText)console_dialog.findViewById(R.id.entry_one_exp);
entry_two_exp = (EditText)
console_dialog.findViewById(R.id.entry_two_exp);
Button save_console_name = (Button)
console_dialog.findViewById(R.id.btn_save_dialog_console);
Button btn_retrive_console = (Button)
console_dialog.findViewById(R.id.btn_retrive_console);
btn_save_d_console.setOnClickListener(new View.OnClickListener( ) {
@Override
public void onClick(View v) {
saveConsoles(console_name.getText().toString().trim(),
c_cost.getText().toString().trim());
}
});
btn_retrive_console.setOnClickListener(new View.OnClickListener( ) {
@Override
public void onClick(View v) {
try {
getConsolesEntries();
} catch (Exception e) {
e.printStackTrace( );
}
}
});
console_dialog.show();
}
//this pulls data from the sqldatabase
private void saveConsoles(String console, String cost) {
DBAdapter db = new DBAdapter(this);
db.openDB();
if (db.insertConsole(console, cost)) {
console_name.setText("");
c_cost.setText("");
Toast.makeText(this, "saved", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "error saving", Toast.LENGTH_SHORT).show();
}
db.closeDB( );
getConsolesEntries( );
}
public void getConsolesEntries( ) {
db = new DBAdapter(this);
db.openDB();
mainEntries.clear();
Cursor c = db.retrieve_Consoles();
while(c.moveToLast()) {
int id = c.getInt(0);
String console = c.getString(1);
String cost = c.getString(2);
java.text.DateFormat dateFormat =
java.text.SimpleDateFormat.getDateTimeInstance();
String c_time = dateFormat.format(new
Date(c.getLong(c.getColumnIndex(Constants.CONSOLE_DATE))).getTime());
entry console_entry = new entry();
console_entry.setCOnsole(console);
console_entry.setCost(cost);
console_entry.setExp_date(c_time);
console_entry.setExp_id(id);
console_entrys.add(console_entry);
}
db.closeDB( );
if (mainEntries.size( ) > 0) {
rview.setAdapter(console_entry);
}
}
@Override
protected void onPostResume() {
super.onPostResume( );
getLaptopsEntries( );
getConsolesEntries( );
}
}
在recyclerview中插入数据的适配器(RVAdapter.java)
public class RVAdapter extends RecyclerView.Adapter{
//these are to holder infomation in the recyclerViewHolder
public LapTopsHolder laptops_holder;
public ConsoleHolder console_holder;
public static final int ITEM_LAPTOP = 0;
public static final int ITEM_CONSOLE = 1;
Context c;
ArrayList<entry> main_entries;
public RVAdapter(Context c, ArrayList<entry> main_entries) {
this.c = c;
this.main_entries = main_entries;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
if ( viewType == ITEM_LAPTOP) {
View v = LayoutInflater.from(parent.getContext(
)).inflate(R.layout.laptop_card, parent, false);
holder = new LapTopsHolder(v);
return holder;
} else if (viewType == ITEM_CONSOLE){
View v2 = LayoutInflater.from(parent.getContext( )).inflate(
R.layout.console_card, parent, false);
console_holder = new ConsoleHolder(v2);
return console_holder;
}
return null;
}
/*public void setAdapter(RVAdapter adapter) {
// bail out if layout is frozen
setLayoutFrozen(false);
setAdapterInternal(adapter, false, true);
requestLayout();
}*/
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int
position) {
entry curEntry = main_entries.get(position);
switch (position){
case ITEM_LAPTOP:
LapTopsHolder holder1 = (LapTopsHolder) holder;
holder1.laptop_name.setText(curEntry.getLaptopName());
holder1.laptop_cost.setText(curEntry.getLapTopAmount());
holder1.ntryTime.setText(curEntry.getTime_date());
break;
case ITEM_CONSOLE:
ConsoleHolder view_holdr = (ConsoleHolder) holder;
view_holdr.console_name.setText(curEntry.getConsoleName());
view_holdr.console_cost.setText(curEntry.getConsoleCost());
view_holdr.console_time.setText(curEntry.getConsole_date());
break;
}
}
@Override
public int getItemCount() {
// return main_entries.size();
return main_entries == null ? 0 :main_entries.size();
}
@Override
public int getItemViewType(int position) {
switch (position) {
case 0:
return ITEM_LAPTOP;
case 1:
return ITEM_CONSOLE;
default:
}
return position;
}
public void deleteEntries(int pos) {
entry entry_delete = main_entries.get(pos);
int id_laptop = entry_delete.getId();
int id_console = entry_delete.getConsole_id();
DBAdapter db = new DBAdapter(c);
db.openDB();
if(db.delete(id_laptop)) {
main_entries.remove(pos);
} else {
Toast.makeText(c, "Unable To Delete", Toast.LENGTH_SHORT).show();
} if (db.delete(id_console)) {
main_entries.remove(pos);
}
db.closeDB();
this.notifyItemRemoved(pos);
}
}
consolesHolder.java
public class ConsoleHolder extends RecyclerView.ViewHolder {
TextView c_name;
TextView c_cost;
TextView c_id;
TextView c_time;
public ConsoleHolder (View itemView) {
super(itemView);
c_name = (TextView) itemView.findViewById(R.id.console_name);
c_cost = (TextView) itemView.findViewById(R.id.console_cost);
c_id = (TextView) itemView.findViewById(R.id.console_id);
c_time = (TextView) itemView.findViewById(R.id.console_time);
}
}
LapTopsHolder.java
public class LapTopsHolder extends RecyclerView.ViewHolder {
public TextView lp_name;
TextView lp_time;
TextView lp_cost;
TextView lp_id;
public LapTopsHolder(View itemView) {
super(itemView);
mView = itemView;
lp_id = (TextView) itemView.findViewById(R.id.laptop_id);
lp_name = (TextView) itemView.findViewById(R.id.laptop_name);
lp_cost = (TextView) itemView.findViewById(R.id.laptop_cost);
lp_time = (TextView) itemView.findViewById(R.id.laptop_time);
}
}
这是我的日志猫..
java.lang.NullPointerException
at
android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:5483)
- at
android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4707)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4617)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1994)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1390)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1353)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:574)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3028)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2906)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3283)
at android.view.View.layout(View.java:15125)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1888)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1742)
at android.widget.TableLayout.onLayout(TableLayout.java:448)
at android.view.View.layout(View.java:15125)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1160)
at android.view.View.layout(View.java:15125)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:1187)
at android.view.View.layout(View.java:15125)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:515)
at android.widget.FrameLayout.onLayout(FrameLayout.java:450)
at android.view.View.layout(View.java:15125)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1888)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1742)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1651)
at android.view.View.layout(View.java:15125)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:515)
at android.widget.FrameLayout.onLayout(FrameLayout.java:450)
at android.view.View.layout(View.java:15125)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1888)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1742)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1651)
at android.view.View.layout(View.java:15125)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:515)
at android.widget.FrameLayout.onLayout(FrameLayout.java:450)
at android.view.View.layout(View.java:15125)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2323)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2029)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1192)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6231)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:788)
at android.view.Choreographer.doCallbacks(Choreographer.java:591)
at android.view.Choreographer.doFrame(Choreographer.java:560)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:774)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5333)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
最佳答案
我通过创建一个 tablayout 和一个 viewpager 来保存两个 recyclerviews，一个用于显示对话框 A 中的值，另一个用于显示对话框 B 中的值来解决它
关于mysql - 我如何实现具有两行的 RecyclerView，其中每行从不同的对话框(DIALOG_A，DIALOG_B)获取数据？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39385289/