无法点击 ArrayList 项目

Question

[我创建了一个使用 ArrayList 存储数据的项目，当我单击列表视图上的每个项目时，它会启动一个新活动，之后我将图像按钮添加到 ListView 现在该应用程序正在正确午餐，但是当我单击项目时没有任何反应。][1]

主要Java代码：

    import androidx.appcompat.app.AppCompatActivity;
    
    import android.content.Intent;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.AdapterView;
    import android.widget.ListView;
    
    import java.util.ArrayList;
    
    public class MainActivity extends AppCompatActivity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            // Create an ArrayList of MusicApp objects
            ArrayList<Music> music = new ArrayList<Music>();
            music.add(new Music(R.drawable.cover1, "Title1", R.drawable.cover1));
            music.add(new Music(R.drawable.cover2, "Title2", R.drawable.cover1));
            music.add(new Music(R.drawable.cover3, "Title3", R.drawable.cover1));
            music.add(new Music(R.drawable.cover4, "Title4", R.drawable.cover1));
            music.add(new Music(R.drawable.cover5, "Title5", R.drawable.cover1));
            music.add(new Music(R.drawable.cover6, "Title6", R.drawable.cover1));
    
            AndroidMusicAdapter musicAdapter = new AndroidMusicAdapter(this, music);
            ListView listView = (ListView) findViewById(R.id.list);
            listView.setAdapter(musicAdapter);
    
            listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    startActivity(position);
                }
            });
        }
    
        public void startActivity(int position) {
    
            if (position == 0) {
                startActivity(new Intent(MainActivity.this, Song1Activity.class));
            }
            if (position == 1) {
                startActivity(new Intent(MainActivity.this, Song2Activity.class));
            }
            if (position == 2) {
                startActivity(new Intent(MainActivity.this, Song3Activity.class));
            }
            if (position == 3) {
                startActivity(new Intent(MainActivity.this, Song4Activity.class));
            }
            if (position == 4) {
                startActivity(new Intent(MainActivity.this, Song5Activity.class));
            }
            if (position == 5) {
                startActivity(new Intent(MainActivity.this, Song6Activity.class));
            }
        }
    }

适配器代码

    import android.app.Activity;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ArrayAdapter;
    import android.widget.Button;
    import android.widget.ImageButton;
    import android.widget.ImageView;
    import android.widget.TextView;
    
    import java.util.ArrayList;
    
    public class AndroidMusicAdapter extends ArrayAdapter<Music> {
        public AndroidMusicAdapter(Activity context, ArrayList<Music> music) {
    
            super(context, 0, music);
        }
    
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
    
            // Check if the existing view is being reused, otherwise inflate the view
            View listItemView = convertView;
            if (listItemView == null) {
                listItemView = LayoutInflater.from(getContext()).inflate(R.layout.list_item, parent, false);
            }
    
            // Get the {@link Music} object located at this position in the list
            Music currentMusic = getItem(position);
    
            // Find the ImageView in the list_item.xml layout with the ID list_item_icon
            ImageView iconView = (ImageView) listItemView.findViewById(R.id.list_item_icon);
            // set the image to iconView
            iconView.setImageResource(currentMusic.getImageResourceId());
    
            // Find the TextView in the list_item.xml layout with the ID song_name
            TextView nameTextView = (TextView) listItemView.findViewById(R.id.song_name);// Get the version name from the current AndroidFlavor object and
            // set this text on the name TextView
            nameTextView.setText(currentMusic.getSongName());
    
            ImageButton playButton = (ImageButton) listItemView.findViewById(R.id.playButton);
            playButton.setImageResource(currentMusic.getPlay());
    
            //Return the whole list item layout (containing 1 textView &nd 1 imageView)
            return listItemView;
    
        }
    }

方法代码

        public class Music {
        
            // Drawable resource ID
            private int mImageResourceId;
        
            // Name of the song
            private String mSongName;
        
            // play button
            private int mPlay;
        
            public Music(int imageResourceId, String songName, int play) {
                mImageResourceId = imageResourceId;
                mSongName = songName;
                mPlay = play;
            }
        
            public int getImageResourceId() {
                return mImageResourceId;
            }
        
            public String getSongName() {
                return mSongName;
            }
        
            public int getPlay() {
                return mPlay;
            }
        }

布局代码

        <?xml version="1.0" encoding="utf-8"?>
        <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            xmlns:app="http://schemas.android.com/apk/res-auto"
            android:orientation="horizontal"
            android:padding="16dp">
        
            <ImageButton
                android:id="@+id/playButton"
                android:layout_width="50dp"
                android:layout_height="50dp"
                android:contentDescription="TODO" />
        
            <ImageView
                android:id="@+id/list_item_icon"
                android:layout_width="50dp"
                android:layout_height="50dp" />
        
            <LinearLayout
                android:layout_width="0dp"
                android:layout_height="50dp"
                android:layout_weight="1"
                android:paddingLeft="16dp">
                <TextView
                    android:id="@+id/song_name"
                    style="@style/titleStyle"/>
        
        
            </LinearLayout>

 

列表查看代码

    <?xml version="1.0" encoding="utf-8"?>
    <ListView xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingLeft="16dp"
        android:paddingTop="16dp"
        android:paddingRight="16dp"
        android:paddingBottom="16dp"
        tools:context=".MainActivity">
    
    </ListView>

Answer 1

您的代码需要改进，但要解决您的问题，您可以添加到您的适配器代码listItemView.setOnClickListner(and implement method click listener)并将您的函数 startActivity 移动到适配器代码，最后将 startActivity 放入listItemView.setOnClickListner并从您的Main 中删除listView.setOnItemClickListener代码

注意：使用new Intent(getcontext(), Song1Activity.class)编辑 startActivity new Intent(MainActivity.this, Song1Activity.class) new Intent(getcontext(), Song1Activity.class)后移动到您的适配器

 public void startActivity(int position) { if (position == 0) { startActivity(new Intent(getcontext(), Song1Activity.class)); } if (position == 1) { startActivity(new Intent(getcontext(), Song2Activity.class)); } if (position == 2) { startActivity(new Intent(getcontext(), Song3Activity.class)); } if (position == 3) { startActivity(new Intent(getcontext(), Song4Activity.class)); } if (position == 4) { startActivity(new Intent(getcontext(), Song5Activity.class)); } if (position == 5) { startActivity(new Intent(getcontext(), Song6Activity.class)); } } }