android - "Select image from gridview and display it on other intent"时出错

Question

我正在尝试从 gridview 中选择图像并将其显示在其他 Intent 上。我看到了这个解决方案:Select image from gridview and display it on other intent

但是我有一个错误，使用调试器我能够发现我的应用程序/程序退出了这一行:

mImage.setImageResource(常量.mThumbIds[索引]);

我检查了索引的数字是好的。

我的代码:显示 Activity .java:

protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    Bundle bdl=getIntent().getExtras();
    int index=bdl.getInt("Index");      
    ImageView mImage = (ImageView) findViewById(R.id.mImgView1);
    int test = Constante.mThumbIds[index];

    mImage.setImageResource(Constante.mThumbIds[index]);

    setContentView(R.layout.display);
}

Constante.java

public class Constante {
// references to our images
public static Integer[] mThumbIds = {
     R.drawable.sample_2, R.drawable.sample_3,
     R.drawable.sample_4, R.drawable.sample_5,
     R.drawable.sample_6, R.drawable.sample_7,
     R.drawable.sample_0, R.drawable.sample_1,
     R.drawable.sample_2, R.drawable.sample_3,
     R.drawable.sample_4, R.drawable.sample_5,
     R.drawable.sample_6, R.drawable.sample_7,
     R.drawable.sample_0, R.drawable.sample_1,
     R.drawable.sample_2, R.drawable.sample_3,
     R.drawable.sample_4, R.drawable.sample_5,
     R.drawable.sample_6, R.drawable.sample_7
};}

Answer 1

您的 ImageView 可能为空。尝试将 setContextView 放在 super 方法之后。