Question

应用程序在通过intent将数据传递给另一个活动时崩溃，代码部分如下：

public class Walls extends Fragment {

    private GridView gridView;
    private GridViewAdapter gridAdapter;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        final View view = inflater.inflate(R.layout.walls, container, false);
        gridView = (GridView) view.findViewById(R.id.gridView);
        gridAdapter = new GridViewAdapter(getContext(), R.layout.grid_item_layout, getData());
        gridView.setAdapter(gridAdapter);

       gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
                ImageItem item = (ImageItem) parent.getItemAtPosition(position);

                //Create intent
                Intent intent = new Intent(Walls.this.getActivity(), DetailsActivity.class);
                intent.putExtra("title", item.getTitle());
                intent.putExtra("image", item.getImage());

                //Start details activity
                startActivity(intent);
            }
        });

...

<activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity android:name=".DetailsActivity"/>

...

该应用程序崩溃没有任何Android默认弹出窗口，即＆＃34;应用已停止＆＃34;

知道问题是什么？

Answer 1

在getActivity()上使用片段的上下文。它可能是NullpointerException所以打印日志并检查。

  gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
                ImageItem item = (ImageItem) parent.getItemAtPosition(position);

                Intent intent = new Intent(getActivity(), DetailsActivity.class);
                intent.putExtra("title", item.getTitle());
                intent.putExtra("image", item.getImage());

                  Log.e("title",""+ item.getTitle());
                  Log.e("image",""+ item.getImage());

                startActivity(intent);
            }
        });

Answer 2

请参阅getTitle，getImage和getAvtivity的返回值。其中一个必须返回null，因此崩溃。

Android应用在startActivity崩溃（意图）

2 个答案: