在 targetSdkVersion 8 上运行 AsyncTask 时 Android 崩溃

Question

当我设置 android:targetSdkVersion="8" 时我的应用程序崩溃了，但是当我将它设置为 android:targetSdkVersion="11" 时一切正常。请查看 logcat，我真的不知道我的代码有什么问题。看起来任何使用低于 11 的 SDK 的设备都会遇到这个问题。我的最小 sdk 是 7。如果我继续交付我的应用程序，我可能会遇到很多麻烦。

public class SingleMenuItemActivity  extends Activity {

    // XML node keys
static final String KEY_TITLE = "title";
static final String KEY_ARTIST = "artist";  
static final String KEY_THUMB_URL = "thumb_url";
private ProgressDialog pDialog;
String title;
String artist;
String image_url;
ImageView view;
Intent intent;
Context context;
ShareActionProvider mShareActionProvider;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.single_list_item);
        new loadSingleView().execute(); 




        view = (ImageView) findViewById(R.id.single_image);

    }

public class loadSingleView extends AsyncTask<String, String, String> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(
                    SingleMenuItemActivity.this);
            pDialog.setMessage("Connecting to Server ...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(false);
            pDialog.show();
        }
        @Override
        protected String doInBackground(String... args) {
            // updating UI from Background Thread


            Intent in = getIntent();

            image_url = in.getStringExtra(KEY_THUMB_URL);
                        title = in.getStringExtra(KEY_TITLE);
            artist = in.getStringExtra(KEY_ARTIST);

            return null;

                    }
        @Override       
        protected void onPostExecute(String args) {
            // dismiss the dialog after getting all products

            ImageLoader imgLoader = new ImageLoader(getApplicationContext());

            imgLoader.DisplayImage(image_url, view);

            TextView lblName = (TextView) findViewById(R.id.name_title);
            TextView lblCost = (TextView) findViewById(R.id.name_artist);



            lblName.setText(title);
            lblCost.setText(artist);

            ActionBar ab = getActionBar();
            ab.setTitle(title);

            pDialog.dismiss();

        }


}   

日志:

08-19 02:19:03.351: E/AndroidRuntime(22761): FATAL EXCEPTION: main
08-19 02:19:03.351: E/AndroidRuntime(22761): java.lang.NullPointerException
08-19 02:19:03.351: E/AndroidRuntime(22761):    at com.example.androidhive.SingleMenuItemActivity$loadSingleView.onPostExecute(SingleMenuItemActivity.java:88)
08-19 02:19:03.351: E/AndroidRuntime(22761):    at com.example.androidhive.SingleMenuItemActivity$loadSingleView.onPostExecute(SingleMenuItemActivity.java:1)
08-19 02:19:03.351: E/AndroidRuntime(22761):    at android.os.AsyncTask.finish(AsyncTask.java:602)
08-19 02:19:03.351: E/AndroidRuntime(22761):    at android.os.AsyncTask.access$600(AsyncTask.java:156)
08-19 02:19:03.351: E/AndroidRuntime(22761):    at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615)
08-19 02:19:03.351: E/AndroidRuntime(22761):    at android.os.Handler.dispatchMessage(Handler.java:99)
08-19 02:19:03.351: E/AndroidRuntime(22761):    at android.os.Looper.loop(Looper.java:137)
08-19 02:19:03.351: E/AndroidRuntime(22761):    at android.app.ActivityThread.main(ActivityThread.java:4512)
08-19 02:19:03.351: E/AndroidRuntime(22761):    at java.lang.reflect.Method.invokeNative(Native Method)
08-19 02:19:03.351: E/AndroidRuntime(22761):    at java.lang.reflect.Method.invoke(Method.java:511)
08-19 02:19:03.351: E/AndroidRuntime(22761):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:982)
08-19 02:19:03.351: E/AndroidRuntime(22761):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
08-19 02:19:03.351: E/AndroidRuntime(22761):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

SDK 8 没有ActionBar。您将不得不使用类似 ActionBarSherlock 库的东西来为 SDK < Honeycomb 提供 ActionBar 支持。