如何扩大另一个活动的布局对话框？

Question

我目前在SecondActivity.class 。 在我的代码中，当我backpress 时，我希望对话框出现在我的 MainActivity.class 上。

这是我关于膨胀对话框布局的代码。

这出现在 SecondActivity.class 而不是我的主要活动上。

 View dialog = LayoutInflater.from(this).inflate(R.layout.dialog_fmcg_popup, null);
                                    TextView tvfmcg2 = dialog.findViewById(R.id.tv_fmcg2);
                                    tvfmcg2.setText(message);
                                    swipeDismissDialog = new SwipeDismissDialog.Builder(this)
                                            .setView(dialog)
                                            .setOnSwipeDismissListener(new OnSwipeDismissListener() {
                                                @Override
                                                public void onSwipeDismiss(View view, SwipeDismissDirection direction) {
                                                    Preferences.setString(Prefkey.last_qualified_fmcg_voucher_on_remove, message);
                                                }
                                            })
                                            .setFlingVelocity(0)
                                            .setOverlayColor(0)
                                            .build()
                                            .show();

Answer 1

那么你可以使用的是ActivityForResult()方法。

您需要开始与您正在做的事情略有不同的活动。

startActivityForResult(new Intent(this, SecondActivity.class), 80);

然后在你的SecondActivity.class你覆盖onBackPressed()方法如下

 @Override
    public void onBackPressed() {
        setResult(Activity.RESULT_OK,new Intent());
        finish();
    }

在你的FirstActivity.class你必须覆盖onActivityResult()方法

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    if (requestCode == 80) {
        if(resultCode == Activity.RESULT_OK){
            View dialog = LayoutInflater.from(this).inflate(R.layout.dialog_fmcg_popup, null);
        TextView tvfmcg2 = dialog.findViewById(R.id.tv_fmcg2);
        tvfmcg2.setText(message);
        swipeDismissDialog = new SwipeDismissDialog.Builder(this)
            .setView(dialog)
            .setOnSwipeDismissListener(new OnSwipeDismissListener()
            {
                @Override
                public void onSwipeDismiss(View view, SwipeDismissDirection direction)
                {
                    Preferences.setString(Prefkey.last_qualified_fmcg_voucher_on_remove, message);
                }
            })
            .setFlingVelocity(0)
            .setOverlayColor(0)
            .build()
            .show();
        }
    }
}

Answer 2

尝试调用方法而不是在MainActivity onStart或onResume中显示对话框

Answer 3

如果你想在你的 MainActivity 而不是你的 SecondActivity 上显示它，你必须像这样启动 SecondActivity：

startActivityForResult(yourIntent, SECOND_ACTIVITY_KEY)

在 BackPresses 上，您可以像这样设置结果

Intent intent=Intent()
intent.putExtra("MESSAGE",message)
setResult(2,intent)

然后在 MainActivity 上，您可以监听结果并调用您的对话框。

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent) {
    // Check which request we're responding to
    if (requestCode == SECOND_ACTIVITY_KEY) {
        // Make sure the request was successful
        if (resultCode == Activity.RESULT_OK) {
            // The user picked a contact.
            // The Intent's data Uri identifies which contact was selected.

            // Do something with the contact here (bigger example below)
        }
    }
}