無法在回收視圖中獲取文本

Question

我正在研究一個項目，用戶可以識別文本（OCR），然后在另一個活動中查看其所有文本（OCR）歷史記錄

應用鏈接： https : //play.google.com/store/apps/details?id=com.thetechroot.vision

我添加了共享首選項和回收視圖，

但我只得到第一個被認可的文本

工作：-用戶在文本活動中識別文本（OCR），然后查看用戶的掃描文本（OCR）歷史記錄，該歷史記錄顯示在不同的活動中

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如何將Textview從一個活動保存到diff活動，並使用共享首選項將其顯示到recycleview中

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TEXTACTIVTY.JAVA

  textRecognizer.processImage(image) .addOnSuccessListener(new OnSuccessListener<FirebaseVisionText>() { @Override public void onSuccess(final FirebaseVisionText firebaseVisionText) { translatelan(firebaseVisionText); cd_text_re.setVisibility(View.VISIBLE); spinnerlan.setVisibility(View.VISIBLE); txtrecog.setText(firebaseVisionText.getText()); String th = SharedCommon.getSharedPreferencesString(getApplicationContext(), texthistory,firebaseVisionText.getText()); //int i = SharedCommon.getPreferencesInt(getApplicationContext(), key1,50); final SharedCommon scth = new SharedCommon(); if (txtrecog.equals("")){ Toast.makeText(TextActivity.this, "Text: "+th, Toast.LENGTH_SHORT).show(); } else { Toast.makeText(TextActivity.this, "Text: "+th, Toast.LENGTH_SHORT).show(); scth.putSharedPreferencesString(getApplicationContext(), SharedCommon.texthistory, th); } /* SharedPreferences.Editor editor = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE).edit(); editor.putString("name", String.valueOf(txtrecog.getText())); editor.putInt("idName", 1); editor.apply();*/ drawtextvision(firebaseVisionText); } }).addOnFailureListener(new OnFailureListener() { @Override public void onFailure(@NonNull Exception e) { 

MyAdapter.java

 public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> { private List<String> values; ArrayList personNames; Context context; // Provide a reference to the views for each data item // Complex data items may need more than one view per item, and // you provide access to all the views for a data item in a view holder public class ViewHolder extends RecyclerView.ViewHolder { // each data item is just a string in this case public TextView txtHeader; public TextView txtFooter; public View layout; public ViewHolder(View v) { super(v); layout = v; txtHeader = (TextView) v.findViewById(R.id.firstLine); txtFooter = (TextView) v.findViewById(R.id.secondLine); } } public void add(int position, String item) { values.add(position, item); notifyItemInserted(position); } public void remove(int position) { values.remove(position); notifyItemRemoved(position); } public MyAdapter(Context context, ArrayList personNames) { this.context = context; this.personNames = personNames; } // Provide a suitable constructor (depends on the kind of dataset) public MyAdapter(List<String> myDataset) { values = myDataset; } // Create new views (invoked by the layout manager) @Override public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { // create a new view /*final String th = SharedCommon.getSharedPreferencesString(getApplicationContext(), texthistory,""); */ LayoutInflater inflater = LayoutInflater.from( parent.getContext()); View v = inflater.inflate(R.layout.layout_history_text, parent, false); // set the view's size, margins, paddings and layout parameters ViewHolder vh = new ViewHolder(v); return vh; } // Replace the contents of a view (invoked by the layout manager) @Override public void onBindViewHolder(final ViewHolder holder, final int position) { // - get element from your dataset at this position // - replace the contents of the view with that element final String name = values.get(position); holder.txtHeader.setText(name); holder.txtHeader.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { holder.txtFooter.setText("Footer: " + name); } }); //holder.txtFooter.setText("Footer: " + name); } // Return the size of your dataset (invoked by the layout manager) @Override public int getItemCount() { return values.size(); } } 

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HISTORYACTIVITY.JAVA

 public class AboutActivity extends AppCompatActivity { /* WebView webView;*/ ProgressDialog mprogreeinternet; String apppackagename = "com.thetechroot.vision"; int versionCode = BuildConfig.VERSION_CODE; String versionName = BuildConfig.VERSION_NAME; String appid = BuildConfig.APPLICATION_ID; Button btnlimit; WebView webview; /* private RecyclerView recyclerView; private RecyclerView.Adapter mAdapter; private RecyclerView.LayoutManager layoutManager;*/ private RecyclerView recyclerView; private MyAdapter mAdapter; private RecyclerView.LayoutManager mLayoutManager; LinearLayout layouthide,layoutcredit; int[] photos={R.drawable.logoam, R.drawable.iconshandwrit52,R.drawable.productsearch52,R.drawable.iconsqrcode52}; ImageButton arrdown,arrup,arrcre,arrcreup; TextView txthistory; TextView mItemDescription; ImageButton mDescriptionImg,mupImg; CardView cdhistory; @SuppressLint("WrongViewCast") @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_about); /* btnlimit = (Button) findViewById(R.id.btnlimit);*/ final String th = SharedCommon.getSharedPreferencesString(getApplicationContext(), texthistory,""); // Toast.makeText(this, ""+th, Toast.LENGTH_SHORT).show(); recyclerView = (RecyclerView) findViewById(R.id.my_recycler_view); // use this setting to improve performance if you know that changes // in content do not change the layout size of the RecyclerView // recyclerView.setHasFixedSize(true); // use a linear layout manager mLayoutManager = new LinearLayoutManager(this); recyclerView.setLayoutManager(mLayoutManager); // Use the default animator // recyclerView.setItemAnimator(new DefaultItemAnimator()); // you could add item decorators // RecyclerView.ItemDecoration itemDecoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST); // recyclerView.addItemDecoration(itemDecoration); ArrayList<String> values = new ArrayList<String>(); /*for (int i = 0; i < 100; i++) { values.add("Test" + i); }*/ Toast.makeText(this, ""+String.valueOf(th), Toast.LENGTH_SHORT).show(); values.add(""+String.valueOf(th)); // specify an adapter (see also next example) mAdapter = new MyAdapter(values); recyclerView.setAdapter(mAdapter); ItemTouchHelper.SimpleCallback simpleItemTouchCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) { @Override public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) { return false; } @Override public void onSwiped(RecyclerView.ViewHolder viewHolder, int swipeDir) { // input.remove(viewHolder.getAdapterPosition()); mAdapter.notifyItemRemoved(viewHolder.getAdapterPosition()); } }; ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleItemTouchCallback); itemTouchHelper.attachToRecyclerView(recyclerView); } @Override public void onBackPressed() { super.onBackPressed(); Intent startIntent = new Intent(AboutActivity.this, TextActivity.class); startActivity(startIntent); finish(); } } 

Answer 1

這是position問題，您必須使用setTag( ）和getTag() ，檢查一下

final String name = values.get(position);
**holder.txtFooter.setTag(name);**
    holder.txtHeader.setText(name);
    holder.txtHeader.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {

        **holder.txtFooter.setText("Footer: " + v.getTag());**
    }
});

Answer 2

在TEXTACTIVTY.JAVA中，您使用的是單個字符串，因此，不是在共享首選項中將其附加到以前的字符串，而是替換了歷史記錄。 理想情況下，您應該保存Strings數組並檢索相同的數組。 當前值的大小為1，因為它只有一個字符串。 首先使用Sting Array。 要將字符串數組保存在共享首選項中，請執行以下操作

StringBuilder sb = new StringBuilder();
for (int i = 0; i < playlists.length; i++) {
    sb.append(playlists[i]).append(",");
}
prefsEditor.putString(PLAYLISTS, sb.toString());

然后，當您從SharedPreferences獲取字符串時，只需像下面這樣解析它：

String[] playlists = playlist.split(",");

從共享首選項中引用Put和獲取String數組

還有https://blog.fossasia.org/storing-a-data-list-in-phimpme-android/ 。