Question

运行我的应用时出现此错误：

12-14 12:04:42.088: E/AndroidRuntime(331): FATAL EXCEPTION: main
12-14 12:04:42.088: E/AndroidRuntime(331): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.awesomefilebuilderwidget/com.example.awesomefilebuilderwidget.GridViewAdapter}: java.lang.InstantiationException: com.example.awesomefilebuilderwidget.GridViewAdapter
12-14 12:04:42.088: E/AndroidRuntime(331):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1746)
12-14 12:04:42.088: E/AndroidRuntime(331):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1854)
12-14 12:04:42.088: E/AndroidRuntime(331):  at android.app.ActivityThread.access$1500(ActivityThread.java:135)
12-14 12:04:42.088: E/AndroidRuntime(331):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1041)
12-14 12:04:42.088: E/AndroidRuntime(331):  at android.os.Handler.dispatchMessage(Handler.java:99)
12-14 12:04:42.088: E/AndroidRuntime(331):  at android.os.Looper.loop(Looper.java:150)
12-14 12:04:42.088: E/AndroidRuntime(331):  at android.app.ActivityThread.main(ActivityThread.java:4333)
12-14 12:04:42.088: E/AndroidRuntime(331):  at java.lang.reflect.Method.invokeNative(Native Method)
12-14 12:04:42.088: E/AndroidRuntime(331):  at java.lang.reflect.Method.invoke(Method.java:507)
12-14 12:04:42.088: E/AndroidRuntime(331):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-14 12:04:42.088: E/AndroidRuntime(331):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-14 12:04:42.088: E/AndroidRuntime(331):  at dalvik.system.NativeStart.main(Native Method)
12-14 12:04:42.088: E/AndroidRuntime(331): Caused by: java.lang.InstantiationException: com.example.awesomefilebuilderwidget.GridViewAdapter
12-14 12:04:42.088: E/AndroidRuntime(331):  at java.lang.Class.newInstanceImpl(Native Method)
12-14 12:04:42.088: E/AndroidRuntime(331):  at java.lang.Class.newInstance(Class.java:1409)
12-14 12:04:42.088: E/AndroidRuntime(331):  at android.app.Instrumentation.newActivity(Instrumentation.java:1040)
12-14 12:04:42.088: E/AndroidRuntime(331):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1738)
12-14 12:04:42.088: E/AndroidRuntime(331):  ... 11 more

这是我的GridViewAdapter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;
    @SuppressWarnings("unused")
    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 {
            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");
    }
    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;
}

}

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>

我在SOF上看了一下但是没有找到任何有助于解决这个问题的东西。导致此错误的原因是什么？

请注意，在我收到此错误之前，此工作正常

Answer 1

从清单中删除适配器类引用。

您只在清单

中添加活动类

Answer 2

它崩溃是因为您在清单中指定了一个适配器类，删除它并且您没有应用程序的默认启动活动你需要在清单中使用这样的东西：

<activity android:name=".put your started activity name here"
              android:label="@string/app_name">
 <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

指定您想要的活动

错误：无法实例化活动组件信息

2 个答案: