Question

我之前已经发布了一个问题，现在我没有错误但是当我尝试在我的模拟Android设备上运行我的应用程序时，它会出现一个错误，上面写着

抱歉应用程序Hello Grid View （进程com.HelloGridView）有意外停了下来。请试试试。

以下是文件稍后将遵循的文件树：

HelloGridView  
src  
com.HelloGridView  
HelloGridView.java  
ImageAdapter.java  
gen  
Android 2.2  
assets  
res  
drawable( with all the pics)

HelloGridView.java

package com.HelloGridView;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.Toast;

public class HelloGridView extends Activity {
    /** Called when the activity is first created. */
    @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);

            GridView gridview = (GridView) findViewById(R.id.gridview);
            gridview.setAdapter(new ImageAdapter(this));

            gridview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
                    Toast.makeText(HelloGridView.this, "" + position, Toast.LENGTH_SHORT).show();
                }
            });
        }
    }

ImageAdapter.java

package com.HelloGridView;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;

public class ImageAdapter extends BaseAdapter {
    private Context mContext;

    public ImageAdapter(Context c) {
        mContext = c;
    }

    public ImageAdapter(HelloGridView c) {
        // TODO Auto-generated constructor stub
    }

    public int getCount() {
        return mThumbIds.length;
    }

    public Object getItem(int position) {
        return null;
    }

    public long getItemId(int position) {
        return 0;
    }

    // create a new ImageView for each item referenced by the Adapter
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView;
        if (convertView == null) {  // if it's not recycled, initialize some attributes
            imageView = new ImageView(mContext);
            imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            imageView.setPadding(8, 8, 8, 8);
        } else {
            imageView = (ImageView) convertView;
        }

        imageView.setImageResource(mThumbIds[position]);
        return imageView;
    }

    // references to our images
    private 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
    };
}

这是我的main.xml

<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/gridview"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    android:columnWidth="90dp"
    android:numColumns="auto_fit"
    android:verticalSpacing="10dp"
    android:horizontalSpacing="10dp"
    android:stretchMode="columnWidth"
    android:gravity="center"
/>

Answer 1

如果从ImageAdapter类中删除这些行，一切都会正常工作。

public ImageAdapter(HelloGridView c) {
    // TODO Auto-generated constructor stub
}

这个构造函数被调用，你的Context没有被设置。我不是Java专家，但我认为它被调用，因为它更具体。

您已经有了这个构造函数来处理设置上下文。

public ImageAdapter(Context c) {
    mContext = c;
}

另一个解决方案是将现有的构造函数更改为此，它也可以正常工作。

public ImageAdapter(HelloGridView c) {
    mContext = c;
}

Answer 2

问题是由于本教程中的这一行 “将图像文件保存到项目的res / drawable /目录中。”

在你的项目中，你没有这个文件夹，而是/ drawable-hdpi（ldpi ......等）

所以解决它，只需在res目录下创建新文件夹并将其命名为“drawable”并将图像导入该文件夹。

OR

AndroidManifest.xml中的

将“@ drawable / icon”行更新到您的文件夹。

从android.com运行hellogridview的问题

2 个答案: