所以我有一个由xml数组列表填充的列表视图。当我单击列表中的一行时，它会通过意图到详细信息页面开始一个新活动。我希望能够向右或向左滑动以获得与listview中下一行对应的下一个详细信息页面。我已经设置了我的onSwipeRight和onSwipeLeft，但是我不知道要在其中填充下一个/上一个详细信息页面。
这是我的主要活动，列表视图和点击监听器将相关信息传递给详细信息活动
public class MainActivity extends AppCompatActivity {
MyDBHandler dbHandler;
int listViewPosition;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
dbHandler = new MyDBHandler(this, null, null, 1);
//Action Bar customization
final android.support.v7.app.ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayOptions(android.support.v7.app.ActionBar.DISPLAY_SHOW_CUSTOM);
actionBar.setCustomView(R.layout.actionbar);
setContentView(R.layout.activity_main);
//fill list view with xml array of routes
final CharSequence[] routeListViewItems = getResources().getTextArray(R.array.routeList);
////fill list view with xml array of route numbers
final TypedArray routeNumberImages = getResources().obtainTypedArray(R.array.routeNumberImages);
//fills route detail text view with xml array info
final CharSequence[] routeDetail= getResources().getTextArray(R.array.routeDetail);
//fills route detail image view with xml array of images
final TypedArray image = getResources().obtainTypedArray(R.array.routeImages);
//custom adapter for list view
ListAdapter routeAdapter = new CustomAdapter(this, routeListViewItems, routeNumberImages);
final ListView routeListView = (ListView) findViewById(R.id.routeListView);
routeListView.setAdapter(routeAdapter);
//sets first visible list item
listViewPosition = getIntent().getIntExtra("listViewPosition", 0);
routeListView.setSelectionFromTop(listViewPosition, 0);
routeListView.setOnItemClickListener(
new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
CharSequence route = routeListViewItems[position];
int imageId = (int) image.getResourceId(position, -1);
if (route.equals(routeListViewItems[position]))
{
Intent intent = new Intent(view.getContext(), RouteDetails.class);
intent.putExtra("route", routeDetail[position]);
intent.putExtra("imageResourceId", imageId);
intent.putExtra("routeName", routeListViewItems[position]);
intent.putExtra("listViewPosition", position);
startActivity(intent);
}
}
}
);
}
并使用onswipe监听器继承了我的详细信息页面
public class RouteDetails extends AppCompatActivity {
MyDBHandler dbHandler;
ImageView routeImage;
String routeName;
CharSequence route;
CheckBox routeCheckBox;
int listViewPosition;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_route_details);
dbHandler = new MyDBHandler(this, null, null, 1);
//sets actionbar title
routeName = getIntent().getExtras().getString("routeName");
getSupportActionBar().setTitle(routeName);
//TextView for route details
final TextView routeDetailsView = (TextView) findViewById(R.id.routeDetailsView);
route = getIntent().getExtras().getCharSequence("route");
routeDetailsView.setText(route);
//ImageView for route details
routeImage = (ImageView) findViewById(R.id.routeImage);
final int mImageResource = getIntent().getIntExtra("imageResourceId", 0);
routeImage.setImageResource(mImageResource);
///gets position of row that was clicked to pass into database
listViewPosition = getIntent().getIntExtra("listViewPosition", 0);
///////////////
routeDetailsView.setOnTouchListener(new OnSwipeTouchListener(this) {
@Override
public void onSwipeLeft() {
// Whatever
Intent i = new Intent(RouteDetails.this,RouteDetails.class);
startActivity(i);
}
@Override
public void onSwipeRight() {
// Whatever
Intent i = new Intent(RouteDetails.this,RouteDetails.class);
startActivity(i);
}
});
///////////////
}
感谢您的帮助！
在实施新代码后编辑错误
01-04 12:55:51.694 25443-25443/com.example.zach.listview E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.zach.listview, PID: 25443
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.zach.listview/com.example.zach.listview.RouteDetails}: java.lang.NullPointerException: Attempt to read from null array
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: Attempt to read from null array
at com.example.zach.listview.RouteDetails.onCreate(RouteDetails.java:56)
at android.app.Activity.performCreate(Activity.java:6251)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
答案 0 :(得分：1)
您应该传递整个数组以及当前位置（您已经做过），而不是将单个项目传递到您的详细信息页面。
在您的点击事件（MainActivity）中，替换：
intent.putExtra("route", routeDetail[position]);
intent.putExtra("routeName", routeListViewItems[position]);
with：
intent.putExtra("routes", routeDetail);
intent.putExtra("routeNames", routeListViewItems);
在RouteDetails中，您需要获取数组和当前对象：
CharSequence[] routes;
CharSequence[] routeNames;
// ...
listViewPosition = getIntent().getIntExtra("listViewPosition", 0);
routes = getIntent().getExtras().getCharSequenceArray("routes");
routeNames = getIntent().getExtras().getCharSequenceArray("routeNames");
route = routes[listViewPosition];
routeName = routeNames[listViewPosition];
在您的滑动事件中，只需将数组与上一个或下一个索引一起传递：
routeDetailsView.setOnTouchListener(new OnSwipeTouchListener(this) {
@Override
public void onSwipeLeft() {
// Whatever
Intent i = new Intent(RouteDetails.this,RouteDetails.class);
i.putExtra("routes", routes);
i.putExtra("routeNames", routeNames);
i.putExtra("imageResourceId", imageId);
i.putExtra("listViewPosition", position + 1);
startActivity(i);
}
@Override
public void onSwipeRight() {
// Whatever
Intent i = new Intent(RouteDetails.this,RouteDetails.class);
i.putExtra("routes", routes);
i.putExtra("routeNames", routeNames);
i.putExtra("imageResourceId", imageId);
i.putExtra("listViewPosition", position - 1);
startActivity(i);
}
});