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android - .getImage() 上的空对象引用 android

问题描述

我有一个片段。单击图像后，我开始活动。但我不断收到这个错误

Unable to start activity ComponentInfo{com.flag.app/com.flag.app.app.activity.MarkerDetailsActivity}:
java.lang.NullPointerException: Attempt to invoke virtual method 'com.flag.app.app.model.Image com.flag.app.app.model.Marker.getImage()' 
on a null object reference

所以，这是我的活动 

public class MarkerDetailsActivity extends AppCompatActivity {

public static Intent getStartIntent(Context context, Marker marker) {
    Intent startIntent = new Intent(context, MarkerDetailsActivity.class);
    startIntent.putExtra(EXTRA_MARKER, marker);
    return startIntent;
}


ImageView mImageView;
TextView mNameTextView;
Marker mMarker;
MapView mMapView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_details_marker);
    mMarker = getIntent().getParcelableExtra(EXTRA_MARKER);

    mImageView = findViewById(R.id.image_view);
    mMapView = findViewById(R.id.map_view);
    mMapView.onCreate(savedInstanceState);
    bindMarker(mMarker);
}

private void bindMarker(Marker marker) {
    Picasso.with(mImageView.getContext())
            .load(marker.getImage().getUrl())
            .into(mImageView);
    mAuthorTextView.setText(marker.getAuthor());
    mDescriptionTextView.setText(marker.getDescription());
    mDateTextView.setText(marker.getDate());

}
   }

如何解决？

标签： androidandroid-fragmentsandroid-activitynullpointerexception

解决方案

检查空值。

private void bindMarker(Marker marker) {
if(marker != null){
    Picasso.with(mImageView.getContext())
            .load(marker.getImage().getUrl())
            .into(mImageView);
    mAuthorTextView.setText(marker.getAuthor());
    mDescriptionTextView.setText(marker.getDescription());
    mDateTextView.setText(marker.getDate());

}}

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