android：如何在TabActivity上设置backpress？哪个标签只包含两个活动？

• 我尝试在offerDetails Activity的backpress上调用我的OffersActivity（我正在使用ActivityGroup和TabActivity） .

• 我得到错误到ArrayIndexOutOFBound ...最后两个我试着这个完成，但它没有由我完成..指导我..解决这个问题 . 在这个当我运行第一个选项卡是OffersActivity打开列表当我单击列表项打开其详细信息视图（OfferDetailsActivity）并按回它给出错误强制关闭..

我应用这个例子： - http://www.jtben.com/document/695851

但它给出了错误 05-15 10:35:00.755: E/AndroidRuntime(279): FATAL EXCEPTION: main 05-15 10:35:00.755: E/AndroidRuntime(279): java.lang.IndexOutOfBoundsException: Invalid index 1, size is 1 05-15 10:35:00.755: E/AndroidRuntime(279): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:257) 05-15 10:35:00.755: E/AndroidRuntime(279): at java.util.ArrayList.remove(ArrayList.java:406) 05-15 10:35:00.755: E/AndroidRuntime(279): at com.wae.saterra.view.OffersActivity.back(OffersActivity.java:149) 05-15 10:35:00.755: E/AndroidRuntime(279): at com.wae.saterra.view.OffersActivity.onBackPressed(OffersActivity.java:173) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.app.Activity.onKeyUp(Activity.java:1888) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.view.KeyEvent.dispatch(KeyEvent.java:1061) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.app.Activity.dispatchKeyEvent(Activity.java:2068) 05-15 10:35:00.755: E/AndroidRuntime(279): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1643) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:788) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:788) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:788) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.widget.TabHost.dispatchKeyEvent(TabHost.java:275) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:788) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:788) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:788) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:788) 05-15 10:35:00.755: E/AndroidRuntime(279): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1667) 05-15 10:35:00.755: E/AndroidRuntime(279): at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1102) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.app.Activity.dispatchKeyEvent(Activity.java:2063) 05-15 10:35:00.755: E/AndroidRuntime(279): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1643) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.view.ViewRoot.deliverKeyEventToViewHierarchy(ViewRoot.java:2471) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2441) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.view.ViewRoot.handleMessage(ViewRoot.java:1735) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.os.Handler.dispatchMessage(Handler.java:99) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.os.Looper.loop(Looper.java:123) 05-15 10:35:00.755: E/AndroidRuntime(279): at android.app.ActivityThread.main(ActivityThread.java:4627) 05-15 10:35:00.755: E/AndroidRuntime(279): at java.lang.reflect.Method.invokeNative(Native Method) 05-15 10:35:00.755: E/AndroidRuntime(279): at java.lang.reflect.Method.invoke(Method.java:521) 05-15 10:35:00.755: E/AndroidRuntime(279): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 05-15 10:35:00.755: E/AndroidRuntime(279): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 05-15 10:35:00.755: E/AndroidRuntime(279): at dalvik.system.NativeStart.main(Native Method)

我的代码：

• TabActivity

'

扩展TabActivity {TabHost tabHost;

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.sattera_tab_activity);
        tabHost = getTabHost();
        init();

    }

    private void init() {
        Intent intent;
        intent=new Intent().setClass(this, OffersActivity.class);
        tabHost.addTab(tabHost
                .newTabSpec("OffersActivity")
                .setIndicator("OffersActivity",
                        getResources().getDrawable(R.drawable.ic_prominent))
                .setContent(intent));



//      tabHost.addTab(tabHost.newTabSpec(null)
//              .setIndicator(null, getResources().getDrawable(R.drawable.ic_prominent))
//              .setContent(new Intent(this,OffersActivity.class)));
        tabHost.addTab(tabHost.newTabSpec(null)
                .setIndicator(null, getResources().getDrawable(R.drawable.ic_products))
                .setContent(new Intent(this,ProductsActivity.class)));
        tabHost.addTab(tabHost.newTabSpec(null)
                .setIndicator(null, getResources().getDrawable(R.drawable.ic_service_ol))
                .setContent(new Intent(this,ServiceActivity.class)));
        tabHost.addTab(tabHost.newTabSpec(null)
                .setIndicator(null, getResources().getDrawable(R.drawable.ic_tenda_ol))
                .setContent(new Intent(this,TendaOLActivity.class)));
        tabHost.addTab(tabHost.newTabSpec(null)
                .setIndicator(null, getResources().getDrawable(R.drawable.ic_notify))
                .setContent(new Intent(this,ContactUsActivity.class)));
        //int currentTab = getIntent().getExtras().getInt(OffersActivity.TAB_ID);
        tabHost.setCurrentTab(0);
//      Intent intent;
//      intent=new Intent().setClass(this, OffersActivity.class);
//      tabHost.addTab(tabHost
//              .newTabSpec(null)
//              .setIndicator(null,
//                      getResources().getDrawable(R.drawable.ic_prominent))
//              .setContent(intent));
//      intent=new Intent().setClass(this, ProductsActivity.class);
//      tabHost.addTab(tabHost
//              .newTabSpec(null)
//              .setIndicator(null,
//                      getResources().getDrawable(R.drawable.ic_products))
//              .setContent(intent));
//      intent=new Intent().setClass(this, ServiceActivity.class);
//      tabHost.addTab(tabHost
//              .newTabSpec(null)
//              .setIndicator(null,
//                      getResources().getDrawable(R.drawable.ic_service_ol))
//              .setContent(intent));
//      intent=new Intent().setClass(this, TendaOLActivity.class);
//      tabHost.addTab(tabHost
//              .newTabSpec(null)
//              .setIndicator(null,
//                      getResources().getDrawable(R.drawable.ic_tenda_ol))
//              .setContent(intent));
//      intent=new Intent().setClass(this, ContactUsActivity.class);
//      tabHost.addTab(tabHost
//              .newTabSpec(null)
//              .setIndicator(null,
//                      getResources().getDrawable(R.drawable.ic_notify))
//              .setContent(intent));
//
//      tabHost.setCurrentTab(2);
//

}

}”

• 1）OffersActivity

'public class OffersActivity extends ActivityGroup implements
    OnItemClickListener {

CustomArrayAdapter adapter;
ListView lvProducts;
ArrayList<Products> productObj;
Products product;
public static OffersActivity group;

private ArrayList<View> history;

// View rootView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.product_list);

    this.history = new ArrayList<View>();
    group = this;

    init();
    // hideFB();
    // hideTwitter();
    setTitle(getResources().getString(R.string.title_offer));
    // API Call

    if (Global.isNetworkAvailable(OffersActivity.this)) {
        new ProductAsyncTask().execute(Constants.url);
    } else {
        Intent intent = new Intent(OffersActivity.this,
                OfflineActivity.class);
        startActivity(intent);

        // AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
        // this);
        //
        // // set title
        // alertDialogBuilder.setTitle("No Internet Connection Available  ");
        //
        // // set dialog message
        // alertDialogBuilder
        // .setMessage("Click yes to exit!")
        // .setCancelable(false)
        // .setPositiveButton("Yes",
        // new DialogInterface.OnClickListener() {
        // public void onClick(DialogInterface dialog,
        // int id) {
        // Intent intent = new Intent(
        // OffersActivity.this,
        // OffersActivity.class);
        // startActivity(intent);
        //
        // }
        // });
        //
        // AlertDialog alertDialog = alertDialogBuilder.create();
        // // show it
        // alertDialog.show();
    }
}

@Override
protected void onResume() {
    super.onResume();
    if (adapter != null) {
        adapter.notifyDataSetChanged();
    }
}

private void init() {
    productObj = new ArrayList<Products>();
    lvProducts = (ListView) findViewById(R.id.lv_products);
    lvProducts.setOnItemClickListener(this);
}

@Override
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {


        Intent intent = new Intent(OffersActivity.this,
                OffersDetailActivity.class);
        intent.putExtra("product", (Products) productObj.get(position));
        // startActivity(intent);

        View view = getLocalActivityManager().startActivity("OffersDetailActivity",
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)).getDecorView();
        replaceView(view);

    }

    public void loadData() {
        adapter = new CustomArrayAdapter(OffersActivity.this,
                R.layout.product_list_row, productObj);

        lvProducts.setAdapter(adapter);
    }

    protected void back() {

        if(history.size() > 0) {  
            history.remove(history.size());  
            setContentView(history.get(history.size()));  
        }else {  
            finish();  
        }   

    }

    protected void replaceView(View view) {
//      if (history.size() == 0) {
//          if (rootView != null) {
//              history.add(rootView);
//              rootView = null;
//          }
//      }
        // Adds the old one to history
        history.add(view);
        // Changes this Groups View to the new View.
        setContentView(view);

    }

    @Override
    public void onBackPressed() {
        OffersActivity.group.back();
        return;
    }

    public class ProductAsyncTask extends
            AsyncTask<String, String, ArrayList<Products>> {

        String responseString = null;
        ProgressDialog progressDialog;

        public ProductAsyncTask() {
            super();
            progressDialog = new ProgressDialog(OffersActivity.this);
            progressDialog.setCancelable(false);
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            progressDialog.setMessage("Loading...");
            progressDialog.show();
        }

        @Override
        protected ArrayList<Products> doInBackground(String... params) {

            responseString = readJSONSFeed(params[0]);
            if (responseString != null) {
                return processUserListJSON(responseString);
            } else {
                return null;
            }
        }

        @Override
        protected void onPostExecute(ArrayList<Products> result) {
            super.onPostExecute(result);
            if (result.size() == 0 || result == null) {
            }
            progressDialog.dismiss();
            loadData();

        }

        private String readJSONSFeed(String url) {

            StringBuilder stringBuilder = new StringBuilder();

            HttpClient httpClient = new DefaultHttpClient();
            HttpGet httpGet = new HttpGet(url + Constants.REQ_FOR_OFFER);



            try {
                HttpResponse response = httpClient.execute(httpGet);
                StatusLine statusLine = response.getStatusLine();

                int statuscode = statusLine.getStatusCode();

                if (statuscode == 200) {
                    HttpEntity httpEntity = response.getEntity();
                    InputStream inputStream = httpEntity.getContent();

                    BufferedReader buffer = new BufferedReader(
                            new InputStreamReader(inputStream));

                    String line = null;
                    if ((line = buffer.readLine()) != null) {
                        stringBuilder.append(line);
                    }
                    // buffer.close();
                    inputStream.close();
                } else {
                }

            } catch (Exception e) {
            }
            return stringBuilder.toString();
        }

        private synchronized ArrayList<Products> processUserListJSON(
                String response) {

            try {
                JSONObject json = new JSONObject(response);
                JSONArray Records = json
                        .getJSONArray(Constants.JSON_OBJECT_DATA);
                for (int i = 0; i < Records.length(); i++) {
                    JSONObject Record = Records.getJSONObject(i);

                    String tProductID = Record.getString("product_id");
                    String tTitle = Record.getString("title");
                    String tImage = Record.getString("image");
                    String tDetails = Record.getString("short_description");
                    String tLongDetails = Record.getString("long_description");
                    String tOffer = Record.getString("offer");
                    String tActive = Record.getString("active");
                    String tPromoText = Record.getString("promotion_text");
                    String tProminent = Record.getString("prominent");

                    product = new Products(tProductID, tTitle, tDetails,
                            tLongDetails, tImage, tOffer, tActive, tPromoText,
                            tProminent);

                    if (product == null) {
                    } else {
                        productObj.add(product);
                    }

                }

            } catch (JSONException ex) {
                System.out.println(ex);
                return null;
            }

            return productObj;
        }

    }

}'

• OfferDeatilsActivity

“
public class OffersDetailActivity extends Activity实现OnClickListener，OnItemSelectedListener {Gallery gallery; TextView prod_descri，productTitle1，productTitle2; ImageAdapter imageAdapter; ImageView leftArrow，rightArrow; private int selectedImagePosition = 0;私人清单;字符串 Headers ，网址， Headers 1;捆绑b;产品产品; ProductDetails pDetails; ArrayList productList;按钮btnFacebook，btnTwitter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.products_details);
    init();
    setTitle(getResources().getString(R.string.title_offer));
    b = getIntent().getExtras();
    product = (Products) b.getSerializable("product");
    if (b != null) {
        if (Global.isNetworkAvailable(OffersDetailActivity.this)) {
            new ProductAsyncTask().execute(Constants.url,
                    product.product_id);
        } else {

            Intent intent = new Intent(OffersDetailActivity.this,
                    OfflineActivity.class);
            startActivity(intent);
        }
    } else {
    }
}

// @Override // public void onBackPressed（）{// OffersActivity.group.back（）; // // super.onBackPressed（）; // //}

private void init() {
    productList = new ArrayList<ProductDetails>();
    gallery = (Gallery) findViewById(R.id.product_gallery);
    prod_descri = (TextView) findViewById(R.id.product_desc);
    productTitle1 = (TextView) findViewById(R.id.productTitle1);
    productTitle2 = (TextView) findViewById(R.id.productTitle2);

    leftArrow = (ImageView) findViewById(R.id.left_arrow_imageview);
    rightArrow = (ImageView) findViewById(R.id.right_arrow_imageview);

    btnFacebook = (Button) findViewById(R.id.btnFB);
    btnFacebook = (Button) findViewById(R.id.btnTwitter);
    //btnFacebook.setOnClickListener(this);
    // btnTwitter.setOnClickListener(this);

    leftArrow.setOnClickListener(this);
    rightArrow.setOnClickListener(this);
    gallery.setOnItemSelectedListener(this);
}

@Override
public void onClick(View v) {

    switch (v.getId()) {
    case R.id.left_arrow_imageview:

        if (selectedImagePosition > 0) {

            // leftArrow.setVisibility(View.VISIBLE);
            --selectedImagePosition;
        } else if (selectedImagePosition == 0) {
            leftArrow.setVisibility(View.GONE);
            rightArrow.setVisibility(View.VISIBLE);
        }
        gallery.setSelection(selectedImagePosition, true);

        break;
    case R.id.right_arrow_imageview:
        if (selectedImagePosition < drawables.size() - 1) {
            // rightArrow.setVisibility(View.VISIBLE);

            ++selectedImagePosition;
        } else if (selectedImagePosition == drawables.size() - 1) {
            rightArrow.setVisibility(View.GONE);
            leftArrow.setVisibility(View.VISIBLE);
        }

        gallery.setSelection(selectedImagePosition, true);

        break;



    default:
        break;
    }

}

@Override
public void onItemSelected(AdapterView<?> parent, View view, int position,
        long id) {

    selectedImagePosition = position;

    productTitle1.setText(product.title);
    productTitle2.setText(productList.get(position).title);
    prod_descri.setText(productList.get(position).description);

    if (selectedImagePosition > 0
            && selectedImagePosition < drawables.size() - 1) {
        leftArrow.setVisibility(View.VISIBLE);
        rightArrow.setVisibility(View.VISIBLE);
    } else if (selectedImagePosition == 0) {
        leftArrow.setVisibility(View.GONE);
    } else if (selectedImagePosition == drawables.size() - 1) {
        rightArrow.setVisibility(View.GONE);
    }
    // setSelectedImage(selectedImagePosition);
}

@Override
public void onNothingSelected(AdapterView<?> arg0) {
}

// AsyncTask

public class ProductAsyncTask extends
        AsyncTask<String, String, ArrayList<ProductDetails>> {

    private Context getDialogContext() {
        Context context;
        if (getParent() != null)
            context = getParent();
        else
            context = OffersDetailActivity.this;
        return context;
    }

    String responseString = null;
    ProgressDialog progressDialog;

    public ProductAsyncTask() {
        super();
        // progressDialog = new ProgressDialog(ProductDetailsActivity.this);
        progressDialog = new ProgressDialog(getDialogContext());
        progressDialog.setCancelable(false);
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        progressDialog.setMessage("Loading...");
        progressDialog.show();
    }

    @Override
    protected ArrayList<ProductDetails> doInBackground(String... params) {

        responseString = readJSONSFeed(params[0], params[1]);

        if (responseString != null) {
            return processProductDetailsJSON(responseString);
        } else {
            return null;
        }
    }

    @Override
    protected void onPostExecute(ArrayList<ProductDetails> result) {
        super.onPostExecute(result);
        if (result.size() == 0 || result == null) {
        }
        progressDialog.dismiss();

        drawables = createDrawables(result);
        imageAdapter = new ImageAdapter(OffersDetailActivity.this,
                drawables);
        if (drawables.size() > 0) {

            gallery.setSelection(selectedImagePosition, true);
        }

        if (drawables.size() == 1) {
            leftArrow.setVisibility(View.GONE);
            rightArrow.setVisibility(View.GONE);
        }

        gallery.setAdapter(imageAdapter);

    }

    private List<Drawable> createDrawables(ArrayList<ProductDetails> result) {

        List<Drawable> drawablesUrl = new ArrayList<Drawable>();
        try {
            for (ProductDetails objProDetails : result) {
                drawablesUrl.add(Global
                        .getBitmapFromURL(objProDetails.image_path));
                // drawablesUrl.add(loadImageFromURL(objProDetails.image_path));
            }
            return drawablesUrl;

        } catch (Exception e) {
            return null;
        }

    }

    @SuppressWarnings("unused")
    private Drawable loadImageFromURL(String image_path) {
        try {
            InputStream is = (InputStream) new URL(url).getContent();
            Drawable d = Drawable.createFromStream(is, "src name");
            return d;
        } catch (Exception e) {
            return null;
        }
    }

    private String readJSONSFeed(String url, String productID) {

        StringBuilder stringBuilder = new StringBuilder();

        HttpClient httpClient = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet(url + Constants.REQ_FOR_PRODUCT_IMAGE
                + productID + Constants.REQ_FOR_OFFER);



        try {
            HttpResponse response = httpClient.execute(httpGet);
            StatusLine statusLine = response.getStatusLine();

            int statuscode = statusLine.getStatusCode();

            if (statuscode == 200) {

                HttpEntity httpEntity = response.getEntity();
                InputStream inputStream = httpEntity.getContent();

                BufferedReader buffer = new BufferedReader(
                        new InputStreamReader(inputStream));

                String line = null;
                if ((line = buffer.readLine()) != null) {
                    stringBuilder.append(line);
                }
                // buffer.close();
                inputStream.close();
            } else {
            }

        } catch (Exception e) {
        }
        return stringBuilder.toString();
    }

    private synchronized ArrayList<ProductDetails> processProductDetailsJSON(
            String response) {

        try {
            JSONObject json = new JSONObject(response);
            JSONArray Records = json
                    .getJSONArray(Constants.JSON_OBJECT_DATA);
            for (int i = 0; i < Records.length(); i++) {
                JSONObject Record = Records.getJSONObject(i);

                String tTitle = Record.getString("title");
                String tImagePath = Record.getString("image_path");
                String tDescription = Record.getString("description");

                pDetails = new ProductDetails(tDescription, tTitle,
                        tImagePath);

                if (pDetails == null) {
                    Log.v("SATERRA", "product object null");
                } else {
                    productList.add(pDetails);
                    Log.v("SATERRA", "product details title ="
                            + productList.get(i).title);
                }
            }

        } catch (JSONException ex) {
            System.out.println(ex);
            return null;
        }

        return productList;
    }

}

}”

• 我得到错误到ArrayIndexOutOFBound ...最后两个我试着这个完成，但它没有由我完成..指导我..解决这个问题 . 在这个当我运行第一个选项卡是OffersActivity打开列表当我单击列表项打开其详细信息视图（OfferDetailsActivity）并按回它给出错误强制关闭..