如何通过单击列表视图项并将值发送到对话框以显示来创建自定义对话框？ [关闭]

Question

以下是我的代码，我不知道如何在ListView 中的项目中添加对话框。

package com.example.bookstore;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class Psihology extends AppCompatActivity {

    ListView mListView;



    int [] images = {
            R.drawable.alchemist,
            R.drawable.hippie,
            R.drawable.child,
            R.drawable.powerofhabbit,
            R.drawable.kakobituvekupravu,
            R.drawable.metafizikapolneljubavi,
            R.drawable.otemeljumorala,
    };

String[] names = {
"Alchemist - Paulo Koeljo",
        "Hippie - Paulo Koeljo",
        "Child health psihology - Julie Turner",
        "The Power of Habbit - Charles Duhigg ",
        "Kako biti uvjek u pravu - Artur Sopenhauer",
        "Metafizika polne ljubavi - Artur Sopenhauer",
        "O temelju morala - Artur Sopenahuer"
};


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_psihology);

        mListView = findViewById(R.id.listViewPsihology);

        CustomAdaptorr customAdaptor = new CustomAdaptorr();
        mListView.setAdapter(customAdaptor);
    }

        class CustomAdaptorr extends BaseAdapter{

            @Override
            public int getCount() {
                return 7;

            }

            @Override
            public Object getItem(int position) {
                return null;
            }

            @Override
            public long getItemId(int position) {
                return 0;
            }

            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                View view =  getLayoutInflater().inflate(R.layout.schoollayout,null);
                ImageView mImageView = view.findViewById(R.id.imageView);
                TextView mTextView = view.findViewById(R.id.textView);

                mImageView.setImageResource(images[position]);
                mTextView.setText(names[position]);

                return view;
            }
        }



    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu,menu);
        return true;
    }


    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()){
            case R.id.school:
                Intent intent = new Intent(Psihology.this,School.class);
                startActivity(intent);
                return true;
            case R.id.psihology:
                Intent intentt = new Intent(Psihology.this,Psihology.class);
                startActivity(intentt);
                return true;
            case R.id.philosophy:
                Intent intenttt = new Intent(Psihology.this,Philosophy.class);
                startActivity(intenttt);
                return true;
            case R.id.newWriters:
                Intent intentttt = new Intent(Psihology.this,NewWriters.class);
                startActivity(intentttt);
                return true;
            case R.id.other:
                Intent intenttttt = new Intent(Psihology.this,Other.class);
                startActivity(intenttttt);
                return true;
        }
        return super.onOptionsItemSelected(item);
    }


}

所以我的问题是：如何为每个图书项目显示一个对话框，并显示图书项目的信息，如书名、作者、图书价格、发行年份等？？

Answer 1

在您的情况下，Dialog 应该具有单独的 xml 文件和扩展 DialogFragment 的 java，当创建该 dialog 的实例时，该文件在 newInstance 方法中获取对话框所需的输入。 这是一个例子：

public class MyDialog extends DialogFragment
{
    private static final String KEY_AUTH = "author";
    private static final String KEY_PRICE = "price";
    private static final String KEY_YEAR = "year";
    private TextView txtauthor;
    private TextView txtprice ;
    private TextView txtyear ;


public static MyDialog newInstance(String author, String price, String year )
{
    Bundle args = new Bundle();
    args.putString(KEY_AUTH , author);
    args.putString(KEY_PRICE , price);
    args.putString(KEY_YEAR , year );

    MyDialog  d = new MyDialog ();
    d.setArguments(args);

    return d;
}

@NonNull
@Override
public Dialog onCreateDialog(@Nullable Bundle savedInstanceState)
{
    View view = LayoutInflater.from(getActivity()).inflate(R.layout.my_dialoge_layout, null);

    initTextViews(view);

    MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(getContext());

    builder.setView(view);

    return builder.create();

 }


    private void initTextViews(View view)
    {

      //get views
        txtauthor= view.findViewById(R.id.txtauthor);
        txtprice = view.findViewById(R.id.txtprice );
        txtyear = view.findViewById(R.id.txtyear );
      //..and so on 

        //then set values 
        txtauthor.setText(getArguments().getString(KEY_AUTH ));
        txtprice.setText(getArguments().getString(KEY_PRICE ));
        txtyear.setText(getArguments().getString(KEY_YEAR ));
    }
}//end of  class MyDialog 

当你想调用 dialog 时，通过上面提到的newInstance 方法调用它：

MyDialog dialog = MyDialog .newInstance("some author", "some price", "some year");
dialog.show(getFragmentManager(), "MyDialogTag");