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السلام عليكم ورحمة الله وبركاته تكرماً من يشرح هذا الكود اريد تعليقات عليه package com.saleem.pdffile; import androidx.annotation.NonNull; import androidx.annotation.Nullable; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.TextView; import com.github.barteksc.pdfviewer.PDFView; public class MainActivity extends AppCompatActivity { ListView pdfListView; public void Button1 (View v){ for (int i = 0; i < 12 ; i++){ int x = i + 2; Log.d("Head", "x="+x); } } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); pdfListView = (ListView) findViewById(R.id.myPDFList); String[] pdfFiles = {"A-Novel-Image-Retrieval-fulltext", "Consumer_Buying_Behavior", "E-Marketing", "ERP", "javed2016", "Knowledge Management", "Managing digital", "Marketing_Information_System", "Marketing_Issues", "MoviesList_From_Start_to_Finish", "Operations On Data", "OperSys_LabManual9", "Products_Services_and_Brands", "Supply chain and demand", "Tabbed_Application_From_Start_to_Finish"}; ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, pdfFiles) { @NonNull @Override public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) { View view = super.getView(position, convertView, parent); TextView myText = (TextView) view.findViewById(android.R.id.text1); return view; } }; pdfListView.setAdapter(adapter); pdfListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long id) { String item = pdfListView.getItemAtPosition(i).toString(); Intent start = new Intent(getApplicationContext(), PDFOpener.class); start.putExtra("pdfFileName", item); startActivity(start); } }); } } package com.saleem.pdffile; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import com.github.barteksc.pdfviewer.PDFView; public class PDFOpener extends AppCompatActivity { PDFView myPDFViewer; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_p_d_f_opener); myPDFViewer = (PDFView) findViewById(R.id.pdfViewer); String getItem = getIntent().getStringExtra("pdfFileName"); if (getItem.equals("A-Novel-Image-Retrieval-fulltext")){ myPDFViewer.fromAsset("A-Novel-Image-Retrieval-fulltext.PDF").load(); } if (getItem.equals("Consumer_Buying_Behavior")){ myPDFViewer.fromAsset("Consumer_Buying_Behavior.PDF").load(); } if (getItem.equals("E-Marketing")){ myPDFViewer.fromAsset("E-Marketing.PDF").load(); } if (getItem.equals("ERP")){ myPDFViewer.fromAsset("ERP.PDF").load(); } if (getItem.equals("javed2016")){ myPDFViewer.fromAsset("javed2016.PDF").load(); } if (getItem.equals("Knowledge Management")){ myPDFViewer.fromAsset("Knowledge Management.PDF").load(); } if (getItem.equals("Managing digital")){ myPDFViewer.fromAsset("Managing digital.PDF").load(); } if (getItem.equals("Marketing_Information_System")){ myPDFViewer.fromAsset("Marketing_Information_System.PDF").load(); } if (getItem.equals("Marketing_Issues")){ myPDFViewer.fromAsset("Marketing_Issues.PDF").load(); } if (getItem.equals("MoviesList_From_Start_to_Finish")){ myPDFViewer.fromAsset("MoviesList_From_Start_to_Finish.PDF").load(); } if (getItem.equals("Operations On Data")){ myPDFViewer.fromAsset("Operations On Data.PDF").load(); } if (getItem.equals("OperSys_LabManual9")){ myPDFViewer.fromAsset("OperSys_LabManual9.PDF").load(); } if (getItem.equals("Products_Services_and_Brands")){ myPDFViewer.fromAsset("Products_Services_and_Brands.PDF").load(); } if (getItem.equals("Supply chain and demand")){ myPDFViewer.fromAsset("Supply chain and demand.PDF").load(); } if (getItem.equals("Tabbed_Application_From_Start_to_Finish")){ myPDFViewer.fromAsset("Tabbed_Application_From_Start_to_Finish.PDF").load(); } } }