Question

我在Activtiy的这一部分（SearchActivity.java）中收到错误：

// Whenever a view in your cart is clicked
shoppinListAdapter.SetOnItemClickListener(new OnItemClickListener() {
           @Override
           public void onItemClick(View view, int position) {
             Utils.switchFragmentWithAnimation(
                                    R.id.frag_container,
                                    new ProductDetailsFragment("", position, true),
                                    ((ECartHomeActivity) (getContext())), null,
                                    Utils.AnimationType.SLIDE_LEFT);
                                   // ECartHomeActivity is the MainActivity
           }
});

这是Utils类的方法，它在Activity：

中使用

public static void switchFragmentWithAnimation(int id, Fragment fragment,
            FragmentActivity activity, String TAG, AnimationType transitionStyle) {

  FragmentManager fragmentManager = activity.getSupportFragmentManager();
  FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

  if (transitionStyle != null) {
    switch (transitionStyle) {
       case SLIDE_UP:
         // Enter from Up
         fragmentTransaction.setCustomAnimations(R.anim.slide_in_up,
                        R.anim.slide_out_up);

         break;

       case SLIDE_LEFT:
         // Enter from left
         fragmentTransaction.setCustomAnimations(R.anim.slide_left,
                        R.anim.slide_out_left);

         break;

       default:
         break;
    }
  }

  CURRENT_TAG = TAG;

  fragmentTransaction.replace(id, fragment);
  fragmentTransaction.addToBackStack(TAG);
  fragmentTransaction.commit();
}

此代码我将我的一个片段粘贴到此Searched_Product_Activtiy.java中。它在片段中工作正常。

Answer 1

问题是您是否正在尝试将ECartHomeActivity转换为((ECartHomeActivity) (getContext())的上下文，因为它不是Activity实例，所以它不起作用。

您可以使用SearchActivity.this作为Util的活动，但将activity参数更改为活动，如下所示：

public static void switchFragmentWithAnimation(int id, Fragment fragment,
            Activity activity, String TAG, AnimationType transitionStyle) {
}

但那可能不是你想要的，我想你想在MainActivity中切换片段。如果这是您的意图，则应使用MainActivity中的startActivityForResult()。为此，首先需要从MainActivity启动ActivitySearch：

public static final int REQUEST_CODE = 1;
...
public void startSearch() {  
  Intent intent=new Intent(MainActivity.this, ActivitySearch.class);  
  startActivityForResult(intent, REQUEST_CODE);
}

其次，在MainActivity中覆盖onActivityResult()以从ActivitySearch接收结果：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  // Check which request we're responding to
  if (requestCode == REQUEST_CODE) {
    // Make sure the request was successful
    if (resultCode == RESULT_OK) {
      // Call your util here
      Utils.switchFragmentWithAnimation(
               R.id.frag_container,
               new ProductDetailsFragment("", position, true),
               MainActivity.this, null,
               Utils.AnimationType.SLIDE_LEFT);

    }
  }
}

最后，在ActivitySearch中，每当您点击搜索中的项目时，您需要将结果发送到MainActivity：

shoppinListAdapter.SetOnItemClickListener(new OnItemClickListener() {
       @Override
       public void onItemClick(View view, int position) {
          Intent intent=new Intent();
          // send data if you want
          //intent.putExtra("DATA", yourdata);  
          setResult(MainActivity.REQUEST_CODE, intent);  
          finish(); // close the SearchActivity
       }

不兼容的类型：AccessControlContext无法转换为ECartHomeActivity（MainActivity）

1 个答案: