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

android-fragmentactivity android-fragments android

Vivek Thakkar · 技术社区 · 8 年前

我在Activtiy(SearchActivity.java)的这一部分中发现了错误:

// 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
           }
});

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();
}

1 回复 | 直到 8 年前

××©× ×××× ×××ª× Mahavir 8 年前

((ECartHomeActivity) (getContext()) 这将不起作用,因为它是一个类而不是活动实例。

您可以使用 SearchActivity.this 作为UTIL的活动,但更改 activity 参数到活动

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

但这可能不是你想要的,我想你想要切换MainActivity中的片段。如果这是你想要的,你应该使用 startActivityForResult() 从主活动。为此,首先需要从主活动启动ActivitySearch:

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

第二,覆盖 onActivityResult() 在MainActivity中,接收ActivitySearch的结果:

@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,无论何时单击搜索上的项目,都需要将结果发送到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
       }