android-studio - 如何在另一个 Activity 中使用一个 Activity 的 onActivityForResult

Question

我目前正在向 github 项目添加更多功能供我个人使用。我需要通过以下任一方式创建要在 GridView 中显示的应用程序列表:
1. 自己写包名(这个功能已经存在)或者
2.从应用程序列表中选择(我想要实现的) - 所有功能都使用ChooserAdapter在ChooserActivity中实现。

解决我的问题的方法是将信息传递给 MainActivity 并调用它的 onActivityResult 方法，因为有很多东西我无法复制粘贴它。
对于 clickListener(每个 GridView 项)，我在 ChooserAdapter 中创建了 OnItemClickListener 接口(interface)，并在 ChooserActivity 中覆盖了它。

选择器 Activity :

    class ChooserActivity : BaseActivity(), ChooserAdapter.OnItemClickListener {
private val backButton: FloatingActionButton by bindView(R.id.back_button_2)

override fun onItemClick(app: ApplicationInfo?) {
    val intent = EditorActivity.IntentBuilder(context)
            .build()
    startActivityForResult(intent, 1)
}


public override fun onActivityResult(requestCode: Int, resultCode: Int, intent: Intent?) {
    Toast.makeText(this, "onActivityResult called ...", Toast.LENGTH_SHORT).show()
    // !!!!!!
    MainActivity().onActivityResult(requestCode, resultCode, intent)
    //How can I write something similar to this to solve my problem?
}

选择适配器:

    public class ChooserAdapter extends RecyclerView.Adapter<ChooserAdapter.ChooserHolder>{

private List<ApplicationInfo> listOfApps;
private Context mContext;
private PackageManager pm;
private OnItemClickListener listener;


public ChooserAdapter(@NonNull Context context, List<ApplicationInfo> list, OnItemClickListener l) {
    this.listOfApps = list;
    this.mContext = context;
    this.pm = context.getPackageManager();
    this.listener =
            new ChooserAdapter.OnItemClickListener(){
        @Override
        public void onItemClick(ApplicationInfo app){
            try{
                Intent intent = (new EditorActivity.IntentBuilder(mContext)).build();
                ((ChooserActivity)mContext).startActivityForResult(intent, 2);
            }catch (Exception e){
                Toast.makeText(mContext, "Error: " + e.getMessage(), Toast.LENGTH_LONG).show();
            }
        }
    };
}

public class ChooserHolder extends RecyclerView.ViewHolder{
     //stuff not useful to be shown
}}

上述代码的结果导致没有使用想要的 MainActivity().onActivityResult(...)，而是使用了 ChooserActivity 的方法。

Answer 1

你必须开始ChooserActivity与 startActivityForResult()来自 MainActivity然后以这种方式传递结果EditorActivity -> ChooserActivity -> MainActivity

class ChooserActivity : BaseActivity(), ChooserAdapter.OnItemClickListener {
    ....
    public override fun onActivityResult(requestCode: Int, resultCode: Int, intent: Intent?) {
       Toast.makeText(this, "onActivityResult called ...", Toast.LENGTH_SHORT).show()
       setResult(Activity.RESULT_OK, intent)
       finish()
    }
    ....
}

覆盖 onActivityResult(...)在 MainActivity并处理结果