Java运行时异常:无法安装活动组件信息小部件

Question

我四处查看了SOF，但没有找到任何有用的东西。

首先，我要说一下发生了什么。当我运行我的小部件时，它一切都很好，直到我点击listView项目上的复选框并运行以下代码：

@Override
                public void onClick(View v) {
                    if (addCheckbox.isChecked()) {
                        System.out.println("Checked");
                        PackageManager pm = mContext.getPackageManager();
                        final int   DEST_IMAGE_WIDTH = 100;
                        final int DEST_IMAGE_HEIGHT = 100;
                        ApplicationInfo appInfo = mContext.getApplicationInfo();
                        Drawable appIcon = pm.getApplicationIcon(appInfo);
                        Bitmap appBmp  = Bitmap.createBitmap(DEST_IMAGE_WIDTH, DEST_IMAGE_HEIGHT, Config.ARGB_8888); 
                        // Creates a new canvas based on the image specification
                        // created just above.
                        Canvas canvas = new Canvas(appBmp);
                        // (optional) Fills the entire canvas
                        canvas.drawColor(Color.WHITE);
                        // You need to set bounds otherwise a 0,0 sized image would be drawn.
                        appIcon.setBounds(0, 0, DEST_IMAGE_WIDTH, DEST_IMAGE_HEIGHT);
                        appIcon.draw(canvas);
                        /// Let's save to a .jpg file ...
                        File file = new File(mContext.getFilesDir().getAbsolutePath() + "/test2.jpg");
                        FileOutputStream out;
                        try
                        {
                            file.createNewFile();
                            out = mContext.getApplicationContext().openFileOutput("BitmapImage", Context.MODE_PRIVATE);
                            appBmp.compress(Bitmap.CompressFormat.JPEG, 80, out);
                            Log.i("AppInfoAdapter", "the icon(s) have been saved");
                            out.close();
                            // Load back the image file to confirm it works
                            // Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath() );
                            // ImageView imageV = (ImageView)findViewById(R.id.);
                            // imageV.setImageBitmap(bitmap);
                        }
                        catch (FileNotFoundException e1)
                        {
                            e1.printStackTrace();
                        }
                        catch (IOException e2)
                        {
                            e2.printStackTrace();
                        }
                        Intent intent = new Intent (v.getContext(), GridViewAdapter.class);
                        v.getContext().startActivity(intent);
                        Log.i("AppInfoAdapter", "New intent started to send icon bitmap");
                    } else {
                        System.out.println("Un-Checked");
                    }

一切都很好，我甚至收到了"New intent开始发送图标位图"的日志消息。然而，一旦完成，我就会得到这个错误：

12-14 13:47:54.413: E/AndroidRuntime(1785): FATAL EXCEPTION: main
12-14 13:47:54.413: E/AndroidRuntime(1785): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.awesomefilebuilderwidget/com.example.awesomefilebuilderwidget.GridViewAdapter}: java.lang.InstantiationException: com.example.awesomefilebuilderwidget.GridViewAdapter
12-14 13:47:54.413: E/AndroidRuntime(1785):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1746)
12-14 13:47:54.413: E/AndroidRuntime(1785):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1854)
12-14 13:47:54.413: E/AndroidRuntime(1785):     at android.app.ActivityThread.access$1500(ActivityThread.java:135)
12-14 13:47:54.413: E/AndroidRuntime(1785):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1041)
12-14 13:47:54.413: E/AndroidRuntime(1785):     at android.os.Handler.dispatchMessage(Handler.java:99)
12-14 13:47:54.413: E/AndroidRuntime(1785):     at android.os.Looper.loop(Looper.java:150)
12-14 13:47:54.413: E/AndroidRuntime(1785):     at android.app.ActivityThread.main(ActivityThread.java:4333)
12-14 13:47:54.413: E/AndroidRuntime(1785):     at java.lang.reflect.Method.invokeNative(Native Method)
12-14 13:47:54.413: E/AndroidRuntime(1785):     at java.lang.reflect.Method.invoke(Method.java:507)
12-14 13:47:54.413: E/AndroidRuntime(1785):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-14 13:47:54.413: E/AndroidRuntime(1785):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-14 13:47:54.413: E/AndroidRuntime(1785):     at dalvik.system.NativeStart.main(Native Method)
12-14 13:47:54.413: E/AndroidRuntime(1785): Caused by: java.lang.InstantiationException: com.example.awesomefilebuilderwidget.GridViewAdapter
12-14 13:47:54.413: E/AndroidRuntime(1785):     at java.lang.Class.newInstanceImpl(Native Method)
12-14 13:47:54.413: E/AndroidRuntime(1785):     at java.lang.Class.newInstance(Class.java:1409)
12-14 13:47:54.413: E/AndroidRuntime(1785):     at android.app.Instrumentation.newActivity(Instrumentation.java:1040)
12-14 13:47:54.413: E/AndroidRuntime(1785):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1738)
12-14 13:47:54.413: E/AndroidRuntime(1785):     ... 11 more

这是有问题的类：

package com.example.awesomefilebuilderwidget;
IMPORTS
public class GridViewAdapter extends BaseAdapter {
private Context Context;
// Keep all Images in array list
public ArrayList<Integer> drawables = new ArrayList<Integer>();
CheckBox mCheckBox=null;
// Constructor
public GridViewAdapter(Context c){
    Context = c;
    Log.d("GridViewAdapter", "Constructor is set");
    drawables.add(R.drawable.pattern1);
    Log.d("GridViewAdapter", "pattern1 added");
    drawables.add(R.drawable.pattern2);
    Log.d("GridViewAdapter", "pattern2 added");
    drawables.add(R.drawable.trashcan);
    Log.d("GridViewAdapter", "trashcan added");
    drawables.add(R.drawable.ic_launcher);
    Log.d("GridViewAdapter", "ic_launcher added");
}
public void setCheckBox(CheckBox checkbox){
    mCheckBox=checkbox;
}
@Override
// How many items are in the data set represented by this Adapter
public int getCount() {
    return drawables.size();
}
@Override
// Get the data item associated with the specified position in the
// data set
public Object getItem(int position) {
    return drawables.get(position);
}
@Override
public long getItemId(int position) {
    return position;
}
public boolean isSdReadable() {
    boolean mExternalStorageAvailable = false;
    String state = Environment.getExternalStorageState();
    if (Environment.MEDIA_MOUNTED.equals(state)) {
    // We can read and write the media
    mExternalStorageAvailable = true;
    Log.i("isSdReadable", "External storage card is readable.");
    } else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
    // We can only read the media
    Log.i("isSdReadable", "External storage card is readable.");
    mExternalStorageAvailable = true;
    } else {
    // Something else is wrong. It may be one of many other
    // states, but all we need to know is we can neither read nor write
    mExternalStorageAvailable = false;
    }
    return mExternalStorageAvailable;
    }
public Bitmap getThumbnail() {
    final String APP_PATH_SD_CARD = "/TEST/";
    final String APP_THUMBNAIL_PATH_SD_CARD = "thumbnails";
    String filename = "AFBWIcon.png";
    String fullPath = Environment.getExternalStorageDirectory().getAbsolutePath() + APP_PATH_SD_CARD + APP_THUMBNAIL_PATH_SD_CARD;
    Bitmap thumbnail = null;
    // Look for the file on the external storage
    try {
    if (isSdReadable() == true) {
    thumbnail = BitmapFactory.decodeFile(fullPath + "/" + filename);
    }
    } catch (Exception e) {
    Log.e("getThumbnail() on external storage", e.getMessage());
    }
    // If no file on external storage, look in internal storage
    if (thumbnail == null) {
    try {
    File filePath = Context.getFileStreamPath(filename);
    FileInputStream fi = new FileInputStream(filePath);
    thumbnail = BitmapFactory.decodeStream(fi);
    } catch (Exception ex) {
    Log.e("getThumbnail() on internal storage", ex.getMessage());
    }
    }
    return thumbnail;
    }

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    // Try to reuse the views
    ImageView view = (ImageView) convertView;
    boolean checked = (mCheckBox==null)?false:(((CheckBox)  mCheckBox).isChecked());
    // if convert view is null then create a new instance else reuse it
    if (view == null) {
        view = new ImageView(Context);
        Log.d("GridViewAdapter", "new imageView added");
    }
    if(checked == true){
        isSdReadable();
        try {
            Log.i("GridViewAdapter", "checkbox is checked");
            FileInputStream in = Context.openFileInput("BitmapImage");
            // Load back the image file to confirm it works
            Bitmap bitmap = BitmapFactory.decodeStream(in);
            view.setImageBitmap(bitmap);
            in.close();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        // getThumbnail();
        catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    } else {
        Log.e("GridView", "Icons not for use/checkbox not checked");
    }
    view.setImageResource(drawables.get(position));
    view.setScaleType(ImageView.ScaleType.CENTER_CROP);
    view.setLayoutParams(new android.widget.GridView.LayoutParams(70, 70));
    view.setTag(String.valueOf(position));
    return view;
}
}

此外，这是我的清单：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.awesomefilebuilderwidget"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<receiver android:name="com.example.awesomefilebuilderwidget.AFBWidget"  android:label="@string/app_name">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
</intent-filter>
<meta-data android:name="android.appwidget.provider"
android:resource="@xml/widget_stuff"/>
</receiver>
<activity android:name="com.example.awesomefilebuilderwidget.WidgetConfig" android:label="@string/app_name">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_CONFIGURE"/>
</intent-filter> 
</activity>   
<activity android:name="com.example.awesomefilebuilderwidget.Drag_and_Drop_App" android:label="@string/app_name" android:windowSoftInputMode="stateHidden" android:screenOrientation="portrait"></activity>
<activity android:name="com.example.awesomefilebuilderwidget.AppInfoAdapter" android:label="@string/app_name" ></activity>
<activity android:name="com.example.awesomefilebuilderwidget.Feedback" android:label="@string/app_name" ></activity>
<activity android:name="com.example.awesomefilebuilderwidget.GridView" android:label="@string/app_name" ></activity>
<activity android:name="com.example.awesomefilebuilderwidget.SendMessageActivity" android:label="@string/app_name" ></activity>
<activity android:name="com.example.awesomefilebuilderwidget.Utilities" android:label="@string/app_name" ></activity>
<activity android:name="com.example.awesomefilebuilderwidget.Personalize" android:label="@string/app_name" ></activity>
<activity android:name="com.example.awesomefilebuilderwidget.SwipeDetector" android:label="@string/app_name"></activity>
<activity android:name="com.example.awesomefilebuilderwidget.GridViewAdapter" android:label="@string/app_name"></activity>/
</application>
</manifest> 

有人告诉我，由于它是一个适配器，而不是一个活动，我应该将它从清单中删除。但是，当我这样做的时候，我会得到这个错误：

12-14 12:57:04.047: E/AndroidRuntime(708): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.awesomefilebuilderwidget/com.example.awesomefilebuilderwidget.GridV‌​iewAdapter}; have you declared this activity in your AndroidManifest.xml?

我似乎在是否上课的选择之间左右为难。

到目前为止，我还没有遇到这个问题，我已经尝试清理我的项目。

请帮忙！

Answer 1

有人告诉我，由于它是一个适配器，而不是一个活动，我应该将它从清单中删除。

正确。

但是，当我这样做的时候，我会得到这个错误：

这可能是因为在上面显示的代码中，您错误地调用了startActivity()，试图将GridV‌​iewAdapter作为一个活动启动。GridV‌​iewAdapter不是活动。如果要启动活动，请编写一个活动，将其添加到清单中，然后为新编写的活动调用startActivity()。

您可以在文档中了解有关活动的更多信息。