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私のカスタムアレイアダプタにはバグがありますが、なぜAndroidスタジオがこのコードの第28行に下線を引いているのかわかりません。 "View listItemView = convertView;" ...到達不能の文カスタムアレイアダプタのバグ：o/
package com.example.android.miwok;
import android.app.Activity;
import android.support.annotation.NonNull;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import java.util.ArrayList;
public class WordAdapter extends ArrayAdapter<Word> {
public WordAdapter(Activity context, ArrayList<Word> words) {
// Here, we initialize the ArrayAdapter's internal storage for the context and the list.
// the second argument is used when the ArrayAdapter is populating a single TextView.
// Because this is a custom adapter for two TextViews and an ImageView, the adapter is not
// going to use this second argument, so it can be any value. Here, we used 0.
super(context, 0, words);
}
@Override
public View getView(int position, View convertView, ViewGroup parent){
return super.getView(position, convertView, 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 AndroidFlavor} object located at this position in the list
Word currentWord = getItem(position);
// Find the TextView in the list_item.xml layout with the ID version_name
TextView defaultTextView = (TextView) listItemView.findViewById(R.id.default_text_view);
// Get the version name from the current AndroidFlavor object and
// set this text on the name TextView
defaultTextView.setText(currentWord.getDefaultTranslation());
// Find the TextView in the list_item.xml layout with the ID version_number
TextView miwokTextView = (TextView) listItemView.findViewById(R.id.miwok_text_view);
// Get the version number from the current AndroidFlavor object and
// set this text on the number TextView
miwokTextView.setText(currentWord.getMiwokTranslation());
// Return the whole list item layout (containing 2 TextViews and an ImageView)
// so that it can be shown in the ListView
return listItemView;
}
}
それは、新しく作成されたオブジェクト使用しています：
package com.example.android.miwok;
public class Word {
/** Default translation for the word */
private String mDefaultTranslation;
/** Miwok translation for the word */
private String mMiwokTranslation;
/**
* Create a new Word object.
*
* @param defaultTranslation is the word in a language that the user is already familiar with
* (such as English)
* @param miwokTranslation is the word in the Miwok language
*/
public Word(String defaultTranslation, String miwokTranslation) {
mDefaultTranslation = defaultTranslation;
mMiwokTranslation = miwokTranslation;
}
/**
* Get the default translation of the word.
*/
public String getDefaultTranslation() {
return mDefaultTranslation;
}
/**
* Get the Miwok translation of the word.
*/
public String getMiwokTranslation() {
return mMiwokTranslation;
}
}
をし、この活動から呼び出されます。
package com.example.android.miwok;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ListView;
import java.util.ArrayList;
public class NumbersActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_numbers);
// Create a list of words
ArrayList<Word> words = new ArrayList<Word>();
words.add(new Word("one", "lutti"));
words.add(new Word("two", "otiiko"));
words.add(new Word("three", "tolookosu"));
words.add(new Word("four", "oyyisa"));
words.add(new Word("five", "massokka"));
words.add(new Word("six", "temmokka"));
words.add(new Word("seven", "kenekaku"));
words.add(new Word("eight", "kawinta"));
words.add(new Word("nine", "wo’e"));
words.add(new Word("ten", "na’aacha"));
// Create an {@link WordAdapter}, whose data source is a list of {@link Word}s. The
// adapter knows how to create list items for each item in the list.
WordAdapter adapter = new WordAdapter(this, words);
// Find the {@link ListView} object in the view hierarchy of the {@link Activity}.
// There should be a {@link ListView} with the view ID called list, which is declared in the
// activity_numbers.xml layout file.
ListView listView = (ListView) findViewById(R.id.list);
// Make the {@link ListView} use the {@link WordAdapter} we created above, so that the
// {@link ListView} will display list items for each {@link Word} in the list.
listView.setAdapter(adapter);
}
}
はそれらがすべての必要なファイルです願っています。 提案ありがとうございました
？実行可能スニペットのスクリプト要素としてのコードへのリンク？どのようにコードを見るはずですか？ –
sry、im here here ...しかし、Run code snippetをクリックすると、コード全体がかなり良く見えます;） –
ええ、私は外部サイトにリンクするスニペットを実行しようとしています。 –