小编MSr*_*MSr的帖子

我正在从对话框片段拍照.而且我也需要类似的东西startActivityForResult(takePictureIntent, actionCode);

@Override
    public void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {
        super.onActivityResult(requestCode, resultCode, imageReturnedIntent);
        switch (requestCode) {
            case SELECT_PHOTO:
                getActivity();
                if (resultCode == Activity.RESULT_OK) {
                    Uri selectedImage = imageReturnedIntent.getData();
                    String[] filePathColumn = { MediaStore.Images.Media.DATA };
                    Cursor cursor = getActivity().getContentResolver().query(selectedImage, filePathColumn, null, null, null);
                    cursor.moveToFirst();
                    int columnIndex = cursor.getColumnIndex(filePathColumn[0]);

                    setPic();
                }
                break;
            case ACTION_TAKE_PHOTO_B: {
                getActivity();
                if (resultCode == Activity.RESULT_OK) {
                    handleBigCameraPhoto();

                }
                break;
            }
        }   
    }

不要调用此方法.有没有这样的方法可以在对话框片段中使用？

我正试图从画廊中选择照片DialogFragment.但是我nullpointerexception在初始化的过程中得到了cursor.任何想法为什么会出现此错误？

以下是我的代码:

    if (resultCode == Activity.RESULT_OK) {
        Uri selectedImage = imageReturnedIntent.getData();
        String[] filePathColumn = {MediaStore.Images.Media.DATA};
        // Nullpointerexcepiton on this line
        Cursor cursor = getActivity().getContentResolver().query(selectedImage, filePathColumn, null, null, null);
        cursor.moveToFirst();
        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);

        cursor.close();

    }

这是我的logcat错误:

    03-24 12:34:37.645: E/AndroidRuntime(21479): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=65538, result=-1, data=Intent { dat=content://media/external/images/media/3890 flg=0x1 }} to activity {com.example/com.example.MainActivity}: java.lang.NullPointerException

    03-24 12:34:37.645: E/AndroidRuntime(21479):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3462)
    03-24 12:34:37.645: E/AndroidRuntime(21479):    at android.app.ActivityThread.handleSendResult(ActivityThread.java:3505)
    03-24 12:34:37.645: E/AndroidRuntime(21479):    at android.app.ActivityThread.access$1100(ActivityThread.java:150)
    03-24 12:34:37.645: E/AndroidRuntime(21479):    at …

我在纵向模式下有一个查看寻呼机。在横向模式下，我的布局完全不同。从风景回到肖像之后，我想查看viewpager的最后看到的页面。但是总是第一页显示在屏幕上。

这是我的代码：

public class MainActivity extends FragmentActivity {

    public static ViewPager pager=null;
    public static FragmentAdapter adapter;
    PageIndicator mIndicator;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_delict);
        if(getResources().getConfiguration().orientation==Configuration.ORIENTATION_PORTRAIT){
                pager = (ViewPager) findViewById(R.id.pager);
                adapter = new FragmentAdapter(getSupportFragmentManager());
                pager.setOffscreenPageLimit(4);
                pager.setAdapter(adapter);
                mIndicator = (CirclePageIndicator)findViewById(R.id.indicator);
                mIndicator.setViewPager(pager);
                mIndicator.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
                    @Override
                    public void onPageSelected(int position) {
                        Toast.makeText(MainActivity.this, "Changed to page " + position, Toast.LENGTH_SHORT).show();
                    }

                    @Override
                    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
                    }

                    @Override
                    public void onPageScrollStateChanged(int state) {
                    }
                });
            }

    } …