Java android:onListItemClick不工作
DetailActivity.javaJava android:onListItemClick不工作,java,android,Java,Android,DetailActivity.java public void onListItemClick(ListView listview,View itemView,int position,long id) { ListView lv=(ListView)findViewById(R.id.drinks_lv); Intent intent = new Intent(DrinkCategoryActivity.this, DetailActivity.class); intent.putExtr
public void onListItemClick(ListView listview,View itemView,int position,long id) {
ListView lv=(ListView)findViewById(R.id.drinks_lv);
Intent intent = new Intent(DrinkCategoryActivity.this, DetailActivity.class);
intent.putExtra(DetailActivity.EXTRA_DRINKNO,(int)id);
startActivity(intent);
}
代码的第一部分是取自Head first Android Development-2015的DrinkCategoryActivity类。它应该导航到DetailActivity类,但什么也没有发生。listview在单击饮料列表选项时不做任何操作。它只显示第三个活动,不显示任何错误(DetailActivity未启动,它应显示图像、名称和说明。这是如何在listview中实现单击项的方法
public class DetailActivity extends AppCompatActivity {
public static final String EXTRA_DRINKNO = "drinkNo";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
int drinkNo = (int) getIntent().getExtras().get(EXTRA_DRINKNO);
Drink drink = Drink.drinks[drinkNo];
ImageView photo =(ImageView)findViewById(R.id.photo);
photo.setImageResource(drink.getImageResourceId());
photo.setContentDescription(drink.getName());
TextView name=(TextView)findViewById(R.id.name);
name.setText(drink.getName());
TextView description=(TextView)findViewById(R.id.description);
description.setText(drink.getDescription());
}
}
这是如何在listview中实现单击项
public class DetailActivity extends AppCompatActivity {
public static final String EXTRA_DRINKNO = "drinkNo";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
int drinkNo = (int) getIntent().getExtras().get(EXTRA_DRINKNO);
Drink drink = Drink.drinks[drinkNo];
ImageView photo =(ImageView)findViewById(R.id.photo);
photo.setImageResource(drink.getImageResourceId());
photo.setContentDescription(drink.getName());
TextView name=(TextView)findViewById(R.id.name);
name.setText(drink.getName());
TextView description=(TextView)findViewById(R.id.description);
description.setText(drink.getDescription());
}
}
公共类MainActivity扩展AppCompative实现AdapterView.OnItemClickListener
{
最后的字符串数={“1”、“2”、“3”};
@凌驾
创建时受保护的void(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ArrayAdapter=新的ArrayAdapter(this,R.layout.riga,number);
ListView ListView=(ListView)findViewById(R.id.ListView);
setAdapter(适配器);
setOnItemClickListener(this);
}
@凌驾
public void onItemClick(AdapterView adattatore,最终视图组件,内部位置,长id)
{
Toast.makeText(getApplicationContext(),numbers[position],Toast.LENGTH\u LONG.show();
}
}
里加布局
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener
{
final String numbers = {"1","2","3"};
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.riga, numbers);
ListView listView = (ListView)findViewById(R.id.listView);
listView.setAdapter(adapter);
listView.setOnItemClickListener(this);
}
@Override
public void onItemClick(AdapterView<?> adattatore, final View componente, int position, long id )
{
Toast.makeText(getApplicationContext(), numbers[position], Toast.LENGTH_LONG).show();
}
}
活动单元主布局图
<?xml version="1.0" encoding="utf-8"?>
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:id="@+id/textView"
android:textSize="36sp" />
这是我的旧应用程序,用于接管使用implements AdapterView.OnItemClickListener按下的数字公共类MainActivity Extendes AppCompative implements AdapterView.OnItemClickListener
{
最后的字符串数={“1”、“2”、“3”};
@凌驾
创建时受保护的void(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ArrayAdapter=新的ArrayAdapter(this,R.layout.riga,number);
ListView ListView=(ListView)findViewById(R.id.ListView);
setAdapter(适配器);
setOnItemClickListener(this);
}
@凌驾
public void onItemClick(AdapterView adattatore,最终视图组件,内部位置,长id)
{
Toast.makeText(getApplicationContext(),numbers[position],Toast.LENGTH\u LONG.show();
}
}
里加布局
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener
{
final String numbers = {"1","2","3"};
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.riga, numbers);
ListView listView = (ListView)findViewById(R.id.listView);
listView.setAdapter(adapter);
listView.setOnItemClickListener(this);
}
@Override
public void onItemClick(AdapterView<?> adattatore, final View componente, int position, long id )
{
Toast.makeText(getApplicationContext(), numbers[position], Toast.LENGTH_LONG).show();
}
}
活动单元主布局图
<?xml version="1.0" encoding="utf-8"?>
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:id="@+id/textView"
android:textSize="36sp" />
这是我的旧应用程序,用于接管使用implements AdapterView.OnItemClickListener按下的数字,但我想使用onListItemClick方法实现。我解决了问题。我在DrinkCategory活动类中使用了setcontent视图并将其扩展到活动类,但我没有扩展ListActivity。但我想使用onLi实现stItemClick方法我解决了这个问题。我在DrinkCategory活动类中使用了setcontent视图并将其扩展到活动类,但我没有扩展ListActivity。