Question

当用户从活动中点击回来时，我试图从自定义对话框中获取输入。我重写onBackPressed()方法，我看到对话框，但活动就在它之后关闭。

我还尝试在调用对话框后将super.onBackPressed();移动到

@Override
public void onBackPressed() {
    super.onBackPressed();
    if(enableTimer) {
        countDownTimer.cancel();
    }
    if(enableHistorySaving){
        showCustomDialog(vp.getCurrentItem());
        // i want the activity will be closed here after  getting input.
    }
}

showCustomDialogMethod：

public void showCustomDialog(final int position){
    final Dialog dialog = new Dialog(ExerciseActivity.this);
    dialog.setContentView(R.layout.enter_data);
    dialog.setTitle("save your data...");

    Button okButton = (Button) dialog.findViewById(R.id.ok);
    okButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            final int numOfSets = Integer.valueOf(((EditText)dialog.findViewById(R.id.numOfSetsDialog)).getText().toString());
            final String wights = ((EditText)dialog.findViewById(R.id.wights)).getText().toString();
            saveToExcelFile(dayExercises.get(position),wights,numOfSets);
            dialog.dismiss();
        }
    });
    Button cencelButton = (Button) dialog.findViewById(R.id.cencel);
    cencelButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            dialog.dismiss();
        }
    });
    dialog.show();
}

Answer 1

在退出之前，您似乎正在显示一个用于保存用户数据的对话框。

在对话框按钮的super.onBackPressed();方法中添加此行setOnClickListener

注意：它必须是侦听器方法中的最后一行

Answer 2

您可以使用片段通过此代码显示警报

@Override
public void onBackPressed() {
    doubleBackToExitPressed(R.id.content_dashboard);
}

public void doubleBackToExitPressed(int content) {
        if (getFragmentManager().getBackStackEntryCount() > 1) {
            FragmentManager manager = getFragmentManager();
            manager.beginTransaction()
                    .remove(manager.findFragmentById(content))
                    .commit();
            manager.popBackStack();
        } else {
            getFragmentManager().beginTransaction()
                    .add(content, Question.newInstance()
                    .addToBackStack(null).commit();
        }
    }

main_activity.xml：

        <FrameLayout
            android:id="@+id/content_dashboard"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

question.xml：

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/question_layout"
    android:layout_width="match_parent"
    android:layout_height="250dp"
    android:layout_marginLeft="@dimen/dimen_40dp"
    android:layout_marginRight="@dimen/dimen_40dp"
    android:layout_marginTop="@dimen/dimen_16dp"
    android:background="@color/white"
    android:clickable="true"
    android:orientation="vertical"
    android:tag="question"
    app:cardBackgroundColor="@color/colorPrimaryDark">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:weightSum="100">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="20"
            android:background="@color/colorPrimaryDark"
            android:weightSum="100">


        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="20"
            android:background="@color/colorGrayLight"
            android:orientation="vertical"
            android:weightSum="100">

            <TextView
                android:id="@+id/txt_title_dialog"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginRight="@dimen/dimen_16dp"
                android:layout_weight="32"
                android:clickable="true"
                android:gravity="center_vertical"
                android:text="@string/is_login_or"
                android:textColor="@color/black"
                android:textSize="16sp" />

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="40"
                android:clickable="true"
                android:orientation="horizontal"
                android:paddingLeft="12dp"
                android:weightSum="100">

                <TextView
                    android:id="@+id/txt_cancel_question_answer"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_weight="40"
                    android:gravity="center"
                    android:text="@string/no"
                    android:textColor="@color/black"
                    android:textSize="12sp" />

                <TextView
                    android:id="@+id/txt_ok_question_answer"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_weight="40"
                    android:gravity="center"
                    android:text="@string/yes"
                    android:textColor="@color/black"
                    android:textSize="12sp" />

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_weight="20" />

            </LinearLayout>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="28" />

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="40" />

    </LinearLayout>

</android.support.v7.widget.CardView>

question.java：

public class Question extends Fragment {

    @BindView(R.id.user_question)
    LottieAnimationView user_question;
    @BindView(R.id.txt_title_dialog)
    TextView txt_title_dialog;
    @BindView(R.id.txt_cancel_question_answer)
    TextView txt_cancel_question_answer;
    @BindView(R.id.txt_ok_question_answer)
    TextView txt_ok_question_answer;

    public static Question newInstance() {
        Question question = new Question();
        return question;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.question, parent, false);
        ButterKnife.bind(this, view);

        return view;
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {    
    }

    @OnClick(R.id.txt_cancel_question_answer)
    public void setTxt_cancel_question_answer() {
        removeQuestion();

// you can set action for cancel this is



    }

    @OnClick(R.id.txt_ok_question_answer)
    public void setTxt_ok_question_answer() {
        removeQuestion();
// you can set action for ok this is

    }

    public void removeQuestion() {
        FragmentManager manager = getFragmentManager();
        manager.beginTransaction()
                .remove(manager.findFragmentById(content))
                .commit();
        manager.popBackStack();
    }
}

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Answer 3

您可以调用finish（）方法。接受用户的输入后，将按下ok按钮完成活动。

@Override
public void onBackPressed() 
{
if(enableTimer)  
{
    countDownTimer.cancel();
}
if(enableHistorySaving)
{
    showCustomDialog(vp.getCurrentItem());

}
}

public void showCustomDialog(final int position){
final Dialog dialog = new Dialog(ExerciseActivity.this);
dialog.setContentView(R.layout.enter_data);
dialog.setTitle("save your data...");

Button okButton = (Button) dialog.findViewById(R.id.ok);
okButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        final int numOfSets = Integer.valueOf(((EditText)dialog.findViewById(R.id.numOfSetsDialog)).getText().toString());
        final String wights = ((EditText)dialog.findViewById(R.id.wights)).getText().toString();
        saveToExcelFile(dayExercises.get(position),wights,numOfSets);
        dialog.dismiss();
        finish();
    }
});
Button cencelButton = (Button) dialog.findViewById(R.id.cencel);
cencelButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        dialog.dismiss();
    }
});
dialog.show();

}

这是更新的答案。请看看@keiloda

获取输入提醒onBackPressed Android

3 个答案: