[英]Listview not working for Android Studio
我正在嘗試為我的教師創建listView。 出了點問題,該應用無法正常運行,並且預覽顯示了默認的listView。
我的xml代碼是:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
>
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/listView">
</ListView>
</RelativeLayout>
我的Java代碼是:
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.util.ArrayList;
class lectures extends AppCompatActivity {
ListView ListView2;
ArrayAdapter<String> adapter;
public static String[] names = {"Dr.Aiad","Mr.Hamed","Mr.Qahtan","Dr.reza","Mr.Osamah",};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView2 = (ListView)findViewById(R.id.listview);
adapter = new ArrayAdapter<String>(this, android.R.layout.activity_list_item, names);
ListView2.setAdapter(adapter);
}
}
替換您的代碼:)
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.util.ArrayList;
class lectures extends AppCompatActivity {
ListView listView2;
ArrayAdapter<String> adapter;
String[] names = {"Dr.Aiad","Mr.Hamed","Mr.Qahtan","Dr.reza","Mr.Osamah"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView2 = (ListView)findViewById(R.id.listview);
adapter = new ArrayAdapter<String>(this, R.layout.activity_list_item, names);
listView2.setAdapter(adapter);
}
}
希望對您有幫助!! :)
嘗試像這樣的listview =(ListView)findViewById(R.id.listView); String []值=新的String [] {“紅色”,“藍色”,“綠色”,“黃色”,“紫羅蘭色”,“紫色”};
ArrayAdapter adapter = new ArrayAdapter(this,
android.R.layout.simple_list_item_1,
android.R.id.text1, values);
listview.setAdapter(adapter);
listview.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView parent, View view,
int position, long id) {
String itemValue = (String) listview
.getItemAtPosition(position);
Toast.makeText(getApplicationContext(),
"Selected " + itemValue, Toast.LENGTH_LONG).show();
}
});
可以參考-> http://androidcoding.in/2016/04/24/android-tutorial-on-listview/
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