我正在开发一个报价应用程序..它在卡片 View (回收者 View )中包含名言和人名..每个卡片 View 都包含一个复选框..我想做的是..当用户点击特定报价卡的复选框..我需要显示 toast ..保存到收藏夹..并将复选框背景更改为另一张图片(newimg)..当用户再次点击要显示 toast 的复选框。作为已删除的收藏夹 ...并且复选框背景图像应该是默认值。。因此,如何在单独的 Activity 中显示用户标记的所有收藏夹引号..我是android的新手..我没有找到任何引用资料用于我的目的。 .
MainActivity.java
public class MainActivity extends AppCompatActivity {
//recyclerview objects
private RecyclerView recyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String[] AuthorNames = new String[]{"Navagio Beach", "Anse Source d'Argent Beach", "As Catedrais Beach",
"La Concha Beach", "Bondi Beach", "Nissi Beach"};
String[] QuotesGuide = new String[]{"https://www.tripadvisor.com.my/Attraction_Review-g7777607-" +
"d671779-Reviews-Navagio_Beach_Shipwreck_Beach-Anafonitria_Zakynthos_Ionian_Islands.html",
"https://www.tripadvisor.com.my/Attraction_Review-g477968-d637885-Reviews-Anse_Source_D_Argent" +
"-La_Digue_Island.html",
"https://www.tripadvisor.com.my/Attraction_Review-g609028-d1547522-Reviews-As_Catedrais_Beach-Ribadeo_" +
"Province_of_Lugo_Galicia.html",
"https://www.tripadvisor.com.my/Attraction_Review-g187457-d675885-Reviews-La_Concha_Beach-San_Sebastian" +
"_Donostia_Province_of_Guipuzcoa_Basque_Country.html",
"https://www.tripadvisor.com.my/Attraction_Review-g255060-d257354-Reviews-Bondi_Beach-Sydney_" +
"New_South_Wales.html",
"https://www.tripadvisor.com.my/Attraction_Review-g262055-d1519581-Reviews-Nissi_Beach-Ayia_" +
"Napa_Famagusta_District.html"};
RecyclerView myrv = findViewById(R.id.recyclerView);
MyRecycleViewAdapter myAdapter = new MyRecycleViewAdapter( AuthorNames , QuotesGuide , MainActivity.this);
myrv.setLayoutManager(new LinearLayoutManager(this));
myrv.setAdapter(myAdapter);
}}
MyQuote.java
public class MyQuote {
private String author;
private String quotedesc;
private int isLiked = 0;
//constructor initializing values
public MyQuote(String author, String quotedesc) {
this.quotedesc = quotedesc;
this.author = author;
}
//getters
public String getAuthor() {
return author;
}
public int getIsLiked(){return isLiked;}
public String getQuotedesc() {
return quotedesc;
}
public void setIsLiked(int isLiked) {
this.isLiked = isLiked;
}
MyReclerViewadapter.java
public class MyRecycleViewAdapter extends RecyclerView.Adapter<MyRecycleViewAdapter.ViewHolder>{
private MyQuote myQuote;
private String[] AuthorNames;
private String[] QuotesGuide;
private Context mCtx;
public MyRecycleViewAdapter(String[] authorNames, String[] quotesGuide, Context mCtx) {
AuthorNames = authorNames;
QuotesGuide = quotesGuide;
this.mCtx = mCtx;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.sample_quotecards, parent, false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(final MyRecycleViewAdapter.ViewHolder myholder, final int position) {
myholder.tv_author.setText(AuthorNames[position]);
myholder.tv_quote.setText(QuotesGuide[position]);
myholder.im_favlike.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
//Show "Saved to favourite" toast
Toast.makeText(mCtx, " quote saved to favorites",
Toast.LENGTH_LONG).show();
} else {
//Show "Removed from favourite"
Toast.makeText(mCtx, " quote removed from favorites",
Toast.LENGTH_LONG).show();
}
}
});
// share button of a recycler cardview
myholder.buttonViewOption.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(Intent.ACTION_SEND);
intent.putExtra(Intent.EXTRA_TEXT, "share this quote"
+ AuthorNames[myholder.getAdapterPosition()] +
"\nHere is the link to the full review: " + QuotesGuide[myholder.
getAdapterPosition()]);
intent.setType("text/plain");
mCtx.startActivity(Intent.createChooser(intent, "share this quote"));
}
});
}
@Override
public int getItemCount() {
return AuthorNames.length;
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView tv_author;
public CheckBox im_favlike;
public TextView tv_quote;
public ImageButton buttonViewOption;
public ViewHolder(View itemView) {
super(itemView);
im_favlike = itemView.findViewById(R.id.likeimg);
tv_author= itemView.findViewById(R.id.author_title);
tv_quote= itemView.findViewById(R.id.quote_text);
buttonViewOption = itemView.findViewById(R.id.imageViewOptions);
}
}
}
what i want to do is :
whenever i click the (chekbox)favorite..the checkbox image is changing..and on back click it comes to default(unchecked)..and it works fine.. but the problem..is i dont understand how to save these checkbox values...when the user exits the app and open the app again i need to maintain the favorites..checkbox values..
how to store all the favorites(quotes cards)... marked(checked) by the user in a separate activity..
i am new to android.. i dont know about shared preferences..can anyone explain in detail step wise ..what should i do.. it helps me lot..
最佳答案
检查这个示例项目
https://github.com/saini2sandeep/Favourite.git
用于显示 toast“已保存到收藏夹”和“已从收藏夹中删除” 你可以这样做:
//假设 likeButtonCB 是您的复选框,您必须在其上设置一个监听器,如下面的代码所示:
likeButtonCB.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
//Show "Saved to favourite" toast
} else {
//Show "Removed from favourite" toast
}
}
});
现在要更改点赞按钮的图像,您必须制作一个像这样的可绘制文件: 你可以根据你的名字命名它,我将它命名为“like_button_background” 这里“ic_like_heart_button_color”是可绘制的喜欢的按钮图像,“ic_like_heart_button_empty”是不同的图像。
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/ic_like_heart_button_color"
android:state_checked="true" />
<item android:drawable="@drawable/ic_like_heart_button_empty" />
在 xml 代码中将此文件添加到您的复选框背景中,如下所示:
<CheckBox
android:id="@+id/like_button_cb"
android:layout_width="32dp"
android:layout_height="32dp"
android:layout_marginStart="@dimen/margin_left_gen_16"
android:background="@drawable/like_button_background"
android:button="@null"
android:gravity="center"
android:padding="@dimen/padding_gen_4"
android:textSize="@dimen/tv_gen_16"
android:theme="@style/checkBoxStyle"
android:visibility="visible" />
这将解决您的前两个问题。 要为单个卡片保存点赞,您必须在模型类“int isLiked = 0;”中再维护一个字段。在模型类中,根据它,您可以在填充 UI 时更新点赞按钮的状态。
你可以这样做: 例如,这里的故事是您的模型,然后在填充卡片数据时在您的适配器中执行此代码。
if (story.getIsLiked() == 1) {
likeButtonCB.setChecked(true);
} else {
likeButtonCB.setChecked(false);
}
关于android - 添加到新 Activity 的收藏夹,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52928491/