[英]Create DetailsActivity for Each RecyclerView Item
我一直在到處搜索以找到一種方法來單擊我的recyclerview並使其在recyclerview中顯示信息。 我已經看到許多使用列表和意圖來傳遞數據的解決方案,但是我的問題是我正在使用帶有位圖圖像和兩個字符串值的SQLiteDatabase。 我應該如何將這些數據傳遞給另一個活動?
這是我到目前為止的內容:(CustomAdapter類)
public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.TaskHolder> {
private Cursor mCursor;
private OnItemClickListener mOnItemClickListener;
private Context mContext;
/* Callback for list item click events */
public interface OnItemClickListener {
void onListItemClick(int clickedItemIndex);
}
public CustomAdapter(Context mContext) {
this.mContext = mContext;
}
public CustomAdapter()
{
mContext = null;
}
/* ViewHolder for each task item */
public class TaskHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView shoeBrandName;
public TextView shoeName;
public ImageView shoeImage;
public TaskHolder(View itemView) {
super(itemView);
itemView.setOnClickListener(this);
shoeBrandName = (TextView) itemView.findViewById(R.id.textBrandName);
shoeImage = (ImageView) itemView.findViewById(R.id.shoeImage);
shoeName = (TextView) itemView.findViewById(R.id.textShoeName);
}
@Override
public void onClick(View v) {
}
}
@Override
public TaskHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(mContext);
View itemView = inflater
.inflate(R.layout.text_row_item, parent, false);
return new TaskHolder(itemView);
}
@Override
public void onBindViewHolder(TaskHolder holder, int position) {
int idIndex = mCursor.getColumnIndex(DatabaseContract.ShoeColumns._ID);
int imgValue = mCursor.getColumnIndex(DatabaseContract.ShoeColumns.SHOE_IMAGE);
int shoeBrandName = mCursor.getColumnIndex(DatabaseContract.ShoeColumns.SHOE_BRAND);
int shoeName = mCursor.getColumnIndex(DatabaseContract.ShoeColumns.SHOE_NAME);
mCursor.moveToPosition(position);
final int id = mCursor.getInt(idIndex);
byte[] shoeImg = mCursor.getBlob(imgValue);
String brandNameStr = mCursor.getString(shoeBrandName);
String shoeNameStr = mCursor.getString(shoeName);
Bitmap bmp = BitmapFactory.decodeByteArray(shoeImg, 0, shoeImg.length);
holder.itemView.setTag(id);
holder.shoeImage.setImageBitmap(Bitmap.createScaledBitmap(bmp, 100, 100, false));
holder.shoeBrandName.setText(brandNameStr);
holder.shoeName.setText(shoeNameStr);
}
@Override
public int getItemCount() {
return (mCursor != null) ? mCursor.getCount() : 0;
}
public void swapCursor(Cursor cursor) {
if (mCursor != null) {
mCursor.close();
}
mCursor = cursor;
notifyDataSetChanged();
}
}
詳細信息活動:
package com.example.android.myshoecloset;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.TextView;
public class ShoeDetailActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_shoe_detail);
ImageView imgShoe = (ImageView) findViewById(R.id.shoeImgDetails);
TextView brandShoe = (TextView) findViewById(R.id.shoeBrandDetails);
TextView nameShoe = (TextView) findViewById(R.id.shoeNameDetails);
}
}
壁櫥類(定義壁櫥內部的內容)
import android.database.Cursor;
import android.os.Parcel;
import android.os.Parcelable;
/**
* Created by man on 12/21/2017.
*/
public class Closet implements Parcelable
{
private static final String TAG = Closet.class.getSimpleName();
//Brand name
private final String brandName;
//Shoe Name
private final String shoeName;
//Image of the shoe
private final String shoeImage;
public Closet(String brandName, String shoeName, String shoeImage)
{
this.brandName = brandName;
this.shoeName = shoeName;
this.shoeImage = shoeImage;
}
public Closet(Cursor cursor)
{
this.brandName = null;
this.shoeName = null;
this.shoeImage = null;
}
protected Closet(Parcel in)
{
this.brandName = in.readString();
this.shoeName = in.readString();
this.shoeImage = in.readString();
}
public String getShoeImageName()
{
return shoeImage;
}
public String getBrandName()
{
return brandName;
}
public String getShoeName()
{
return shoeName;
}
@Override
public void writeToParcel(Parcel dest, int flags)
{
dest.writeString(brandName);
dest.writeString(shoeName);
dest.writeString(shoeImage);
}
@Override
public int describeContents()
{
return 0;
}
public static final Creator<Closet> CREATOR = new Creator<Closet>(){
@Override
public Closet createFromParcel(Parcel in)
{
return new Closet(in);
}
@Override
public Closet[] newArray(int size)
{
return new Closet[size];
}
};
}
有沒有一種方法可以從每個recyclerview獲取信息,而不必在列表中存儲該recyclerview的內容?
一個簡單的解決方案,但不建議在回收者視圖適配器類上創建靜態變量,然后在項目上單擊,將值分配給這些變量,然后從下一個活動中通過類名調用這些變量
您需要考慮幾件事。
首先, 將您的數據傳遞給新活動 。
您可以創建一個意圖並將數據作為附加項添加到其中,然后在您的活動中,您將獲得這些附加項並使用它們。
在您的點擊事件中
Intent intent = new Intent(context, YourActivity.class);
intent.putExtra("closet_key", closetObject);
在您的活動的onCreate()
Closet closetObject = getIntent().getParcelableExtra("closet_key");
// Use your object
但是,如果您的物體較小,重量較輕,這是適當的,因為如果物體較大,您將得到
另一種選擇是,僅將某種標識符傳遞給活動,並使用該標識符將對象加載到活動中。 因此,您可以傳遞數據庫ID並在活動中查詢該對象。
對於像Bitmaps
這樣的大對象,您可以使用那里的任何庫來為您執行獲取和自動緩存。 您只需要在數據庫中保留圖像的URL或路徑,而不是整個字節數組。
畢加索(Picasso)或格萊德(Glide)可以幫助實現這一點的圖書館,還有很多,我發現它們很簡單,而且做得很好。
public static Bitmap yourBitmap;
public class MovementListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
...
//assign value to **yourBitmap** on item click
yourBitamp = imageBitmap;
}
從任何地方訪問此yourBitmap-
imageView.setImageBitmap(YourRecyclerViewAdapter.yourBitmap);
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