如何向右或向左滑动以获取从列表视图意图开始的下一个活动详细信息

debugcn 发表于 Dev

zsh5032

因此，我有一个由xml数组列表填充的listview。当我单击列表中的一行时，它将通过意图进入详细信息页面来启动新活动。我希望能够向右或向左滑动以获得与列表视图中的下一行相对应的下一个详细信息页面。我已经设置了可以正常工作的onSwipeRight和onSwipeLeft，但是我不知道在其中放入什么以填充下一个/上一个详细信息页面。

这是我的主要活动，其中包括列表视图和单击侦听器，以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);
                    }
                }
            }
    );
}

这是我的详细信息页面以及onswipe侦听器

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);
    }

    });

    ///////////////

}

感谢您的任何帮助！

实施新代码后进行错误编辑

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)

雷米·西莉亚（Remy Cilia）

而不是将单个项目传递到您的详细信息页面，您应该传递整个数组以及当前位置（您已经执行过）。

在您的点击事件（MainActivity）中，替换为：

intent.putExtra("route", routeDetail[position]);
intent.putExtra("routeName", routeListViewItems[position]);

和：

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);
    }
});

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