Question

我想以编程方式将ImageView添加到bodyView方法中的左中心Horizontal。我尝试过以下方式，但没有用。

private LinearLayout makeBodyView() {
    LinearLayout bodyView = new LinearLayout(this);
    LinearLayout.LayoutParams bp = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT);
    //imgrightis imageview
    imgright.setBackgroundResource(R.drawable.img_r);
    bp.gravity = Gravity.CENTER_HORIZONTAL | Gravity.LEFT;
    imgright.setLayoutParams(bp);
    bodyView.addView(imgright);
    gridView = new SkyGridView(this);
    int cn = this.getNumColumns();
    gridView.setNumColumns(cn);
    gridView.setHorizontalSpacing(px(20));
    gridView.setVerticalSpacing(px(15));
    gridView.setPadding(px(20), px(49), px(18), px(20));
    gridView.setOnItemClickListener(onClick);
    gridView.setOnItemLongClickListener(onLongClick);

    gridAdapter = new SkyGridAdapter(this);
    LayoutParams gp = new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT);
    gridView.setLayoutParams(gp);
    bodyView.addView(gridView);
    bodyView.setBackgroundResource(R.drawable.book1);
    return bodyView;
}

Logcat错误：

java.lang.RuntimeException：无法启动活动ComponentInfo {com.adventurewalking / com.adventurewalking.activities.EpubReaderActivity}：java.lang.NullPointerException：尝试调用虚方法＆＃39; void android.widget.ImageView。 setBackgroundResource（INT）＆＃39;在空对象引用上

任何人都可以帮助我吗？

在活动文件中添加ImageView

0 个答案: