android - ListView 适配器 setResult() 和 Finish() 错误

Question

我想通过使用 startActivityForResult() 方法为结果启动Activity。现在启动的 Activity 有一个带有适配器类的 ListView 。我已经编写了以下 ListView 适配器，因此当用户选择任何项目时，它应该返回到调用 Activity 具有所选项目名称。我无法调用 2 个方法

setResult() and finish() in following code

适配器代码:

view.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            SharedPreferences prefernces = mContext.getSharedPreferences("MyKey111", Context.MODE_PRIVATE);
            SharedPreferences.Editor editor1 = prefernces.edit();
            editor1.putString("Custname",customerpopulationlist.get(position).getName());
            editor1.putString("let_id", customerpopulationlist.get(position).getLetId());
            editor1.commit();

            Intent intentMessage = new Intent();

            // put the message in Intent
            intentMessage.putExtra("MESSAGE", "hello");
            intentMessage.putExtra("selected_refer", customerpopulationlist.get(position).getLetId());

            setResult(RESULT_OK, intentMessage);
            finish();

        }
    });

Answer 1

您必须保留对创建适配器的 Activity 的引用，然后将结果设置为该 Activity 。您正在做的事情是设置 OnClickListener 对象的结果!!

将 Activity 对象添加到适配器构造函数中，并将其保存在适配器的本地变量中，并调用它 act，然后调用 activtiy 的 setResult() ，如下所示:

view.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View arg0) {
        SharedPreferences prefernces = mContext.getSharedPreferences("MyKey111", Context.MODE_PRIVATE);
        SharedPreferences.Editor editor1 = prefernces.edit();
        editor1.putString("Custname",customerpopulationlist.get(position).getName());
        editor1.putString("let_id", customerpopulationlist.get(position).getLetId());
        editor1.commit();

        Intent intentMessage = new Intent();

        // put the message in Intent
        intentMessage.putExtra("MESSAGE", "hello");
        intentMessage.putExtra("selected_refer", customerpopulationlist.get(position).getLetId());

        //THESE TWO LINES NEED TO BE CHANGED
        act.setResult(RESULT_OK, intentMessage);
        act.finish();

    }
});