android - Android应用在startActivity崩溃( Intent )

Question

通过意图将数据传递到另一个 Activity 时，应用程序崩溃，部分代码如下:

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"/>

...

该应用程序崩溃了，没有任何Android默认弹出窗口，即“应用程序已停止”

知道是什么问题吗？

Answer 1

在getActivity()上用于Fragment的上下文。它可能是NullpointerException，因此请打印日志并进行检查。

  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);
            }
        });