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java如何通过CustomAdapter将保存在drawable文件夹中的图像传递给NewActivity

4 月，2 周 Questions & Answers

如何将RecyclerView中的图像数组传递给NewActivity.java？我不是指来自row.xml的图像——我想要一组不同于row.xml到NewActivity的新图像。我把这些图片保存在drawable文件夹中

以下是我的相关课程和活动

文件字符串。xml

<string-array name="array_titles"> <item>"<![CDATA[[01] general focus]]>"</item> <item>"<![CDATA[[02] general view for delibration]]>"</item> </string-array> <string-array name="array_lyrics"> <item>"<![CDATA[general]]>"</item> <item>"<![CDATA[ General ]]>"</item> <item>"<![CDATA[ General ]]>"</item> <item>"<![CDATA[ General ]]>"</item> </string-array> <string-array name="newbrandDesc"> <item>"<![CDATA[ description here ]]>"</item> <item>"<![CDATA[ description here ]]>"</item> <item>"<![CDATA[ description here ]]>"</item> <item>"<![CDATA[ here ]]>"</item> </string-array>

文件main活动。xml

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:安卓="http://schemas.安卓.com/apk/res/安卓" xmlns:tools="http://schemas.安卓.com/tools" xmlns:ads="http://schemas.安卓.com/apk/res-auto" 安卓:orientation="vertical" 安卓:layout_weight="1" 安卓:layout_width="match_parent" 安卓:layout_height="match_parent" tools:context=".MainActivity"> <View 安卓:id="@+id/viewerage" 安卓:background="#01312D" 安卓:layout_width="match_parent" 安卓:layout_height="5dp" /> <!-- First Row--> <安卓x.recyclerview.widget.RecyclerView 安卓:layout_width="match_parent" 安卓:layout_height="wrap_content" 安卓:layout_marginBottom="70dp" 安卓:layout_below="@id/viewerage" style="@style/scrollbar_shape_style" 安卓:id="@+id/recyclerview"> </安卓x.recyclerview.widget.RecyclerView> </RelativeLayout>

文件main活动。java

public class MainActivity extends AppCompatActivity { private String TAG = "MainActivity ----- ; "; private static MediaPlayer player; String soundfile; TextView mDetailTv1; RecyclerView mRecyclerview; MyAdapter myAdapter; int [] MusicFile; List<String> title, newDesc, description; int[] icon; ArrayList<Model> arrayList = new ArrayList<Model>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ActionBar actionBar = getSupportActionBar(); actionBar.setTitle("Intro Songs"); setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); // Listview icons for song titles in position icon = new int[]{R.drawable.song, R.drawable.song, R.drawable.song, }; mRecyclerview = findViewById(R.id.recyclerview); mRecyclerview.setLayoutManager(new LinearLayoutManager(this)); title = Arrays.asList(getResources().getStringArray(R.array.array_titles)); // listview descriptions for songs in position description = Arrays.asList(getResources().getStringArray(R.array.array_lyrics)); // listview NewDescriptions (NewActivity) for songs in position newDesc = Arrays.asList(getResources().getStringArray(R.array.newbrandDesc)); // listview soundfile file for songs in position MusicFile = new int[] {R.raw.wex_1, R.raw.wex_2, R.raw.wex_3, , }; for (int i = 0; i< title.size(); i++) { Model model = new Model(title.get(i), description.get(i), newDesc.get(i), icon[i], MusicFile[i]); // Bind all strings in an array arrayList.add(model); } // Pass result to listview class myAdapter = new MyAdapter(this, arrayList); // Bind the adapter to the listview class mRecyclerview.setAdapter(myAdapter); } @Override public void onBackPressed() { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage("Are you sure you want to exit?") .setCancelable(false) .setPositiveButton("Yes", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { MainActivity.this.finish(); } }) .setNegativeButton("No", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { dialog.cancel(); } }); AlertDialog alert = builder.create(); alert.show(); } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater menuInflater = getMenuInflater(); menuInflater.inflate(R.menu.menu, menu); MenuItem item = menu.findItem(R.id.action_search); SearchView searchView = (SearchView) MenuItemCompat.getActionView(item); searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() { @Override public boolean onQueryTextSubmit(String query) { myAdapter.getFilter().filter(query); return false; } @Override public boolean onQueryTextChange(String newText) { myAdapter.getFilter().filter(newText); return false; } }); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == R.id.action_settings) { Toast.makeText(this, "Favorites Selected", Toast.LENGTH_SHORT).show(); startActivity(new Intent(this, FavoritesActivity.class)); return true; // Do more funtionality here } return super.onOptionsItemSelected(item); } }

文件MyAdapter。java

public class MyAdapter extends RecyclerView.Adapter<MyHolder> implements Filterable { Context mContext; ArrayList<Model> models, filterList; // This array list create a list of array // which parameter define in our class CustomFilter filter; public MyAdapter(Context context, ArrayList<Model> models) { this.mContext = context; this.models = models; this.filterList = models; } @NonNull @Override public MyHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) { View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.row, null); // This line inflate our row return new MyHolder(view); // This will return our view to holder class } @Override public void onBindViewHolder(@NonNull final MyHolder myHolder, int i) { myHolder.mTitle.setText(models.get(i).getTitle()); // Here is position myHolder.mDesc.setText(models.get(i).getDesc()); myHolder.mImageView.setImageResource(models.get(i).getIcon()); // Here we used an image resource myHolder.setItemCLickListener(new ItemClickListener() { @Override public void onItemClickListener(View v, int position) { String gTitle = models.get(position).getTitle(); String gDesc = models.get(position).getDesc(); BitmapDrawable bitmapDrawable = (BitmapDrawable)myHolder.mImageView.getDrawable(); Bitmap bitmap = bitmapDrawable.getBitmap(); ByteArrayOutputStream stream = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream); byte[] bytes = stream.toByteArray(); //get our data with intent Intent intent = new Intent(mContext, NewActivity.class); intent.putExtra("actionBarTitle", models.get(position).getTitle()); intent.putExtra("brandNewDesc", models.get(position).getBrandNewDesc()); intent.putExtra("soundfile", models.get(position).getSoundfile()); intent.putExtra("iImage", bytes); mContext.startActivity(intent); return; } }); } @Override public int getItemCount() { return models.size(); } @Override public Filter getFilter() { if (filter == null) { filter = new CustomFilter(filterList, this); } return filter; } }

文件MyHolder。java

public class MyHolder extends RecyclerView.ViewHolder implements View.OnClickListener { ImageView mImageView; TextView mTitle, mDesc; ItemClickListener itemCLickListener; MyHolder(@NonNull View itemView) { super(itemView); this.mImageView = itemView.findViewById(R.id.mainIcon); this.mTitle = itemView.findViewById(R.id.mainTitle); this.mDesc = itemView.findViewById(R.id.mainDesc); itemView.setOnClickListener(this); } @Override public void onClick(View v) { this.itemCLickListener.onItemClickListener(v, getLayoutPosition()); } public void setItemCLickListener(ItemClickListener ic) { this.itemCLickListener = ic; } }

文件自定义过滤器。java

private ArrayList<Model> filterList; private MyAdapter adapter; public CustomFilter(ArrayList<Model> filterList, MyAdapter adapter) { this.filterList = filterList; this.adapter = adapter; } @Override protected FilterResults performFiltering(CharSequence constraints) { FilterResults filterResults = new FilterResults(); if (constraints != null && constraints.length() > 0) { constraints = constraints.toString().toUpperCase(); ArrayList<Model> filterModels = new ArrayList<>(); for (int i = 0; i < filterList.size(); i++) { if (filterList.get(i).getTitle().toUpperCase().contains(constraints)) { filterModels.add(filterList.get(i)); } } filterResults.count = filterModels.size(); filterResults.values = filterModels; } else { filterResults.count = filterList.size(); filterResults.values = filterList; } return filterResults; } @Override protected void publishResults(CharSequence charSequence, FilterResults filterResults) { adapter.models = (ArrayList<Model>) filterResults.values; adapter.notifyDataSetChanged(); } }

文件ItemClickListener。java——接口

public interface ItemClickListener { void onItemClickListener(View v, int position); }

public class NewActivity extends AppCompatActivity { private String TAG = "NewActivity ----- ; "; // Store instance variables private String title; private int page; TextView mBrandNewDesc; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_new); getSupportActionBar().setDisplayHomeAsUpEnabled(true); // Keeps Android screen on while reading through getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); ActionBar actionBar = getSupportActionBar(); mBrandNewDesc = findViewById(R.id.textView); // Get data from previous activity when item of activity is clicked using intent Intent intent = getIntent(); String mActionBarTitle = intent.getStringExtra("actionBarTitle"); String newDescription = intent.getStringExtra("brandNewDesc"); // setctionBar Title actionBar.setTitle(mActionBarTitle); // Get text in text textView mBrandNewDesc.setText(Html.fromHtml(newDescription)); // OK, we are done. Let’s run the project } @Override public void onPointerCaptureChanged(boolean hasCapture) { } }
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共 (1) 个答案

  1. # 1 楼答案

    代替drawable>bitmap>byteArray发送可绘制的资源id，如下代码更改了onBindViewHolder

    @Override
public void onBindViewHolder(@NonNull final MyHolder myHolder, int i) {

    myHolder.mTitle.setText(models.get(i).getTitle()); //here is position
    myHolder.mDesc.setText(models.get(i).getDesc());
    myHolder.mImageView.setImageResource(models.get(i).getIcon()); // here we used imge resource

    myHolder.setItemCLickListener(new ItemClickListener() {
        @Override
        public void onItemClickListener(View v, int position) {

            String gTitle = models.get(position).getTitle();
            String gDesc = models.get(position).getDesc();
            int imageId = models.get(position).getIcon();

            //get our data with the intent
            Intent intent = new Intent(mContext, NewActivity.class);
            intent.putExtra("actionBarTitle", models.get(position).getTitle());
            intent.putExtra("brandNewDesc", models.get(position).getBrandNewDesc());
            intent.putExtra("soundfile", models.get(position).getSoundfile());
            intent.putExtra("iImage", imageId ); // i pass the int id then you can use this id in your next activity.
            mContext.startActivity(intent);
            return;
        }
    });

}

    新活动

        ImageView imageView;
    Intent intent = getIntent();
    if (intent != null && !intent.getExtras().isEmpty()){
        int imageResourceId = intent.getIntExtra("iImage",-1);
        imageView.setImageResource(imageResourceId);
    }