我一直在寻找一种方法来点击我的recyclerview并让它在recyclerview中显示信息。我已经看到很多使用Lists和Intents来传递数据的解决方案，但我的问题是我使用带有Bitmap图像的SQLiteDatabase和两个字符串值。我该怎么把这些数据传递给另一个活动？
以下是我到目前为止：（CustomAdapter类）
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();
}
}
DetailsActivity：
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);
}
}
Closet类（定义壁橱内的内容）
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];
}
};
}
有没有办法从每个Recyclerview获取信息而无需将该recyclerview的内容存储在列表中？
答案 0 :(得分：0)
一个简单的解决方案但不推荐 在recycleler视图适配器类上创建静态变量，然后在项目上单击将值赋给这些变量，然后从下一个按类名调用的活动中访问这些变量
答案 1 :(得分：0)
您需要考虑几件事情。
首先，将您的数据传递给新活动。
您可以创建一个意图并将其作为额外内容添加到其中，然后在您的活动中，您将获得这些额外内容并使用它们。
在您的点击事件中
Intent intent = new Intent(context, YourActivity.class);
intent.putExtra("closet_key", closetObject);
在您的活动中onCreate()
Closet closetObject = getIntent().getParcelableExtra("closet_key");
// Use your object
但是，如果您的物体较小，重量较轻，这是合适的，因为如果物体尺寸较大，您将获得
另一个选项，只是将某种标识符传递给活动，并使用该标识符加载Activity中的对象。因此，您可以传递数据库ID并在活动中查询该对象。
对于像Bitmaps这样的大型对象，您可以使用其中的任何库来为您进行提取和自动缓存。而且您只需要在数据库中保留图像的URL或路径，而不是整个字节数组。
答案 2 :(得分：0)
public static Bitmap yourBitmap;
public class MovementListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
...
//assign value to **yourBitmap** on item click
yourBitamp = imageBitmap;
}
从 -
等任何地方访问此 yourBitmap
imageView.setImageBitmap(YourRecyclerViewAdapter.yourBitmap);