如何更新自定义对话框中的数据 [英] How to update data in a Custom Dialog
本文介绍了如何更新自定义对话框中的数据的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
此时用户单击包含数据的行并显示带有文本字段的对话框.
我希望用户使用此对话框来更新字符串.
The user at the moment clicks on a row which contains data and a Dialog with text fields is displayed.
I want the user to update the strings by using this Dialog.
我该怎么做?
我的数据库类中已经有一个更新方法，但我不确定如何在对话框中实现更新
I have an update method already in my Database Class, but I'm not sure how to implement the update in the Dialog
数据库类
package ie.example.artur.projectrepeat;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteQueryBuilder;
/**
* Created by family on 06/07/2016.
*/
public class DatabaseClass extends SQLiteOpenHelper {
public static final String DATABASE_Name = "Product.db2";
public static final String Table_Name = "product_table2";
public static final String COL_1 = "ID";
public static final String COL_2 = "Name";
public static final String COL_3 = "Quantity";
public static final String COL_4 = "Category";
public static final String COL_5 = "Importance";
Context myContext;
public DatabaseClass(Context context) {
super(context, DATABASE_Name, null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table " + Table_Name + " (ID INTEGER PRIMARY KEY AUTOINCREMENT,NAME TEXT,Quantity TEXT,Category INTEGER,Importance TEXT);");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("Drop Table If Exists" + Table_Name);
onCreate(db);
}
public boolean insertData(String name, String quantity, String category,String importance) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COL_2, name);
contentValues.put(COL_3, quantity);
contentValues.put(COL_4, category);
contentValues.put(COL_5, importance);
long result = db.insert(Table_Name, null, contentValues);
if (result == -1)
return false;
else
return true;
}
public Cursor getAllData() {
SQLiteDatabase db = this.getWritableDatabase();
Cursor res = db.rawQuery("select * from " + Table_Name, null);
return res;
}
public boolean updateData(String id,String name,String quantity,String category,String importance ) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COL_1, id);
contentValues.put(COL_2, name);
contentValues.put(COL_3, quantity);
contentValues.put(COL_4, category);
contentValues.put(COL_5, importance);
db.update(Table_Name,contentValues,"id =?",new String[]{id});
return true;
}
/* public Cursor getCursor(){
SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
queryBuilder.setR
}
*/
public Integer DeleteData (String id) {
SQLiteDatabase db = this.getWritableDatabase();
return db.delete(Table_Name,"ID = ?",new String[]{id});
}
public static void DeleteInformation(String item_name, SQLiteDatabase sqLiteDatabase){
String selection = COL_1+" LIKE ?";
String [] selection_args = {item_name};
sqLiteDatabase.delete(Table_Name,selection,selection_args);
}
public Cursor getInformation(SQLiteDatabase sqLiteDatabase)
{
Cursor cursor;
String [] Projections = {COL_1,COL_2,COL_4};
cursor = sqLiteDatabase.query(Table_Name,Projections,null,null,null,null,null);
return cursor;
}
public Cursor getItem(String item_name ,SQLiteDatabase sqLiteDatabase){
String [] Projections = {COL_1,COL_2,COL_3,COL_4,COL_5};
String selection = COL_1+" LIKE ?";
String [] selection_args = {item_name};
Cursor cursor = sqLiteDatabase.query(Table_Name,Projections,selection,selection_args,null,null,null);
return cursor;
}
}
编辑活动
package ie.example.artur.projectrepeat;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class Edit_Activity extends AppCompatActivity implements AdapterView.OnItemClickListener {
ListView listView;
SQLiteDatabase sqLiteDatabase;
DatabaseClass database;
Cursor cursor;
ListDataAdapter listDataAdapter;
Dialog d;
EditText editText_name,editText_Quantity,editText_Category,editTextId,editText_Number;
Button updateBtn;
EditText nameEditText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.data_list_layout);
listView = (ListView) findViewById(R.id.list_view);
listDataAdapter = new ListDataAdapter(getApplicationContext(), R.layout.row_layout);
listView.setAdapter(listDataAdapter);
listView.setOnItemClickListener(this);
database = new DatabaseClass(getApplicationContext());
editText_name = (EditText) findViewById(R.id.editText_name);
editText_Quantity = (EditText) findViewById(R.id.editText_Quantity);
editText_Category = (EditText) findViewById(R.id.editText_Category);
editText_Number = (EditText)findViewById(R.id.editText_Number);
editTextId = (EditText) findViewById(R.id.editText_id);
sqLiteDatabase = database.getReadableDatabase();
Cursor cursor=database.getInformation(sqLiteDatabase);
if (cursor.moveToFirst()) {
do {
String id, product_name, category;
id = cursor.getString(0);
product_name = cursor.getString(1);
category = cursor.getString(2);
DataProvider dataProvider = new DataProvider(id, product_name, category);
listDataAdapter.add(dataProvider);
} while (cursor.moveToNext()
);
}
}
public void loginMethod() {
// Create an instance of the dialog fragment and show it
MyDialog dialog = new MyDialog();
dialog.show(getFragmentManager(),"my_dialog");
}
/*
private void showDialog(){
Dialog dialog = new Dialog(this);
dialog.setContentView(R.layout.input);
dialog.setTitle("Here Goes the Title");
Button updateBtn = (Button) d.findViewById(R.id.updateBtn);
dialog.show();
}
*/
@Override
public void onItemClick(AdapterView<?> parent, View view, int position , long id) {
TextView tv = (TextView) view.findViewById(R.id.product_id);
sqLiteDatabase = database.getReadableDatabase();
loginMethod();
/*
listView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// custom dialog
final Dialog dialog = new Dialog(context);
dialog.setContentView(R.layout.input);
dialog.setTitle("Title...");
final EditText nameEditText = (EditText) d.findViewById(R.id.product_name);
Button updateBtn = (Button) d.findViewById(R.id.updateBtn);
/* if (position == -1) {
updateBtn.setEnabled(false);
} else
updateBtn.setEnabled(true);
updateBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
dialog.show();
}
});
*/
/*private void displayInputDialog(final int pos) {
d = new Dialog(this);
d.setTitle("List View");
d.setContentView(R.layout.input);
final EditText nameEditText = (EditText) d.findViewById(R.id.product_name);
Button updateBtn = (Button) d.findViewById(R.id.updateBtn);
if (pos == -1) {
updateBtn.setEnabled(false);
} else
updateBtn.setEnabled(true);
updateBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});*
}*/
}
}
MyDialog 类
package ie.example.artur.projectrepeat;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.DialogInterface;
import android.graphics.drawable.LayerDrawable;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
/**
* Created by family on 12/08/2016.
*/
public class MyDialog extends DialogFragment{
LayoutInflater inflater;
View v;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
inflater = getActivity().getLayoutInflater();
v= inflater.inflate(R.layout.input,null);
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setView(v).setPositiveButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
}).setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
return builder.create();
}
}
推荐答案
这是处理自定义对话框类的巧妙方法！
Here is a neat way to handle custom dialog class!
您可以使 MyDialog 类包含 Builder 类，以便它处理 buttonOnClick 方法和文本数据.
You can make MyDialog class to contain Builder class so that it handles buttonOnClick methods and text data.
my_dialog_layout.xml 应包含 4 个编辑文本(名称、类别、数量、重要性)和 3 个按钮(更新、取消、确定)，如第二张图片所示.我不会发布 xml 代码，因为它不是关键部分.
my_dialog_layout.xml should contains 4 editTexts(name, category, quantity, importance) and 3 buttons(update, cancel, ok), as it is shown in your second picture. I won't post the xml code since it's not the critical part.
所以在EditActivity中listView的OnItemClickListener中，你可以
So in OnItemClickListener of the listView in EditActivity, you can
- 构建对话框
- 在编辑文本上设置默认文本
- 为按钮设置 onClickListener
<小时>
MyDialog 类
public class MyDialog extends DialogFragment {
public static final String SimpleName = MyDialog.class.getSimpleName();
private EditText name,category, quantity, importance;
private Button update, positive, negative;
private Builder builder;
private static MyDialog instance = new MyDialog();
public static MyDialog getInstance(){
return instance;
}
@Override
public void onCreate(Bundle savedInstanceState) {
this.setCancelable(true);
if (savedInstanceState != null) {
if (builder != null) {
builder = savedInstanceState.getParcelable(Builder.class.getSimpleName());
}
}
setRetainInstance(true);
super.onCreate(savedInstanceState);
}
@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
Dialog dialog = super.onCreateDialog(savedInstanceState);
// make the dialog's default background transparent so that you can customize the window
dialog.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
return dialog;
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.my_dialog_layout, container, false);
}
@Override
public void onViewCreated(View view, @Nullable final Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
initViews(view);
if (builder != null) {
if (builder.getTextName() != null) {
name.setText(builder.getTextName());
}
if (builder.getTextCategory() != null) {
category.setText(builder.getTextCategory());
}
if (builder.getTextQuantity() != null) {
quantity.setText(builder.getTextQuantity());
}
if (builder.getTextImportance() != null) {
importance.setText(builder.getTextImportance());
}
update.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
builder.getOnUpdateClicked().OnClick(view, getDialog());
}
});
positive.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
builder.getOnPositiveClicked().OnClick(view, getDialog());
}
});
negative.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
builder.getOnNegativeClicked().OnClick(view, getDialog());
}
});
}
}
private void initViews(View view) {
name = (EditText) view.findViewById(R.id.editText_name);
category = (EditText) view.findViewById(R.id. editText_category);
quantity = (EditText) view.findViewById(R.id. editText_quantity);
importance = (EditText) view.findViewById(R.id.editText_importance);
update = (Button) view.findViewById(R.id.update);
positive = (Button) view.findViewById(R.id.positive);
negative = (Button) view.findViewById(R.id.negative);
}
private Dialog show(Activity activity, Builder builder) {
this.builder = builder;
if (!isAdded()){
show(((AppCompatActivity) activity).getSupportFragmentManager(), SimpleName);
}
return getDialog();
}
public static class Builder implements Parcelable {
private OnPositiveClicked onPositiveClicked;
private OnNegativeClicked onNegativeClicked;
private OnUpdateClicked onUpdateClicked;
private textName;
private textCategory;
private textQuantity;
private textImportance;
private Context context;
protected Builder(Parcel in) {
textName = in.readString();
textCategory = in.readString();
textQuantity = in.readString();
textImportance = in.readString();
}
public static final Creator<Builder> CREATOR = new Creator<Builder>() {
@Override
public Builder createFromParcel(Parcel in) {
return new Builder(in);
}
@Override
public Builder[] newArray(int size) {
return new Builder[size];
}
};
public Context getContext() {
return context;
}
public Builder setActivity(Context context) {
this.context = context;
return this;
}
public Builder(Context context) {
this.context = context;
}
public Builder setTextName(String textName) {
this.textName = textName;
return this;
}
public String getTextName() {
return textName;
}
public Builder setTextCategory(String textCategory) {
this.textCategory = textCategory;
return this;
}
public String getTextCategory() {
return textCategory;
}
public Builder setTextQuantity(String textQuantity) {
this.textQuantity = textQuantity;
return this;
}
public String getTextQuantity() {
return textQuantity;
}
public Builder setTextImportance(String textImportance) {
this.textImportance = textImportance;
return this;
}
public String getTextImportance() {
return textImportance;
}
public OnPositiveClicked getOnPositiveClicked() {
return onPositiveClicked;
}
public Builder setOnPositiveClicked(OnPositiveClicked onPositiveClicked) {
this.onPositiveClicked = onPositiveClicked;
return this;
}
public OnNegativeClicked getOnNegativeClicked() {
return onNegativeClicked;
}
public Builder setOnNegativeClicked(OnNegativeClicked onNegativeClicked) {
this.onNegativeClicked = onNegativeClicked;
return this;
}
public OnUpdateClicked getOnUpdateClicked() {
return onUpdateClicked;
}
public Builder setOnUpdateClicked(OnUpdateClicked onUpdateClicked) {
this.onUpdateClicked = onUpdateClicked;
return this;
}
public Builder build() {
return this;
}
public Dialog show() {
return getInstance().show(((Activity) context), this);
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel parcel, int i) {
parcel.writeString(textName);
parcel.writeString(textCategory);
parcel.writeString(textQuantity);
parcel.writeString(textImportance);
}
}
public interface OnPositiveClicked {
void OnClick(View view, Dialog dialog);
}
public interface OnNegativeClicked {
void OnClick(View view, Dialog dialog);
}
}
<小时>
编辑活动
在列表视图 OnItemClickListner 中构建和显示 MyDialog.
build and show MyDialog in a listview OnItemClickListner.
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
MyDialog.Builder dialog=null;
// TODO get the strings from database at the position i
String name =
String category =
String quantity =
String importance =
dialog.setTextName(name)
.setTextCategory(category)
.setTextQuantity(quantity)
.setTextImportance(importance)
.setOnPositiveClicked(new MyDialog.OnPositiveClicked() {
@Override
public void OnClick(View view, Dialog dialog) {
}
})
.setOnNegativeClicked(new MyDialog.OnNegativeClicked() {
@Override
public void OnClick(View view, Dialog dialog) {
}
})
.setOnUpdateClicked(new MyDialog.OnUpdateClicked() {
@Override
public void OnClick(View view, Dialog dialog) {
// TODO update database here
}
})
.build();
dialog.show();
}
});
希望有帮助.如果有错误或更好的方法，请告诉我.
Hope it helps. Let me know if there is a mistake or a better way.
这篇关于如何更新自定义对话框中的数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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