java - 对话框未打开

Question

这是我的代码，应该打开项目的 ListView 。当单击某个项目时，它会打开相应的对话框。出现 ListView ，但根本不显示对话框。我在 logcat 中没有看到任何错误。请帮忙

import android.app.Dialog;
import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.playmaker.BudgetOh.R;
import com.playmaker.BudgetOh.manager.ExpenseManager;
import com.playmaker.BudgetOh.model.Expense;

import java.util.ArrayList;

public class ViewExpense extends ListActivity {
ExpenseManager expenseManager;
ArrayList<Expense> allExpenses;
ArrayList<String> allTitles;
ListView listView;
String titlePosition;
Dialog dialog;
Expense expense;


@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

    expenseManager = new ExpenseManager(this);
    allTitles = new ArrayList<String>();
    allExpenses = expenseManager.getAllExpenses();
    listView = getListView();
    listView.setBackgroundResource(R.color.viewBackground);
    listView.setPadding(10, 20, 10, 15);
    listView.setFooterDividersEnabled(true);
    listView.setHeaderDividersEnabled(true);

    // getting all the titles
    for (Expense expense : allExpenses) {

        allTitles.add(expense.getTitle());
    }
    listView.setAdapter(new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, allTitles));

}

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {

    super.onListItemClick(l, v, position, id);
    titlePosition = allTitles.get(position);
    expense = expenseManager.getExpense(titlePosition);

    dialog = new Dialog(ViewExpense.this);
    dialog.setContentView(R.layout.view_details);

    TextView tvTime, tvTitle, tvAmount, tvCategory, tvComment;

    tvTitle = (TextView) dialog.findViewById(R.id.tvViewTitle);
    tvAmount = (TextView) dialog.findViewById(R.id.tvViewAmount);
    tvCategory = (TextView) dialog.findViewById(R.id.tvViewCategory);
    tvComment = (TextView) dialog.findViewById(R.id.tvViewComment);
    tvTime = (TextView) dialog.findViewById(R.id.tvViewTime);

    dialog.setTitle(expense.getTitle());
    tvTitle.setText(expense.getTitle());
    tvAmount.setText(expense.getAmount());
    tvCategory.setText(expense.getCategory());
    tvComment.setText(expense.getComment());
    tvTime.setText("Created on " + expense.getDate() + " At  "
            + expense.getTime());
    dialog.show();

}

}

这是我的对话框布局

    <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    style="@style/Cream_Back"android:layout_width="match_parent"android:layout_height="match_parent"android:alpha="0.5"android:orientation="vertical"><LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">


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

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="#E3CF57"
                android:gravity="center"
                android:text="Expense Title"
                android:textSize="20sp"
                android:textStyle="italic|bold" />

            <TextView

                android:id="@+id/tvViewTitle"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="fill|center"
                android:padding="20dp"
                android:text="Large Text"
                android:textAppearance="?android:attr/textAppearanceLarge" />

        </LinearLayout>

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

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="#E3CF57"
                android:gravity="center"
                android:text="Expense Amount"
                android:textSize="20sp"
                android:textStyle="italic|bold" />

            <TextView

                android:id="@+id/tvViewAmount"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="fill|center"
                android:padding="20dp"
                android:text="Large Text"
                android:textAppearance="?android:attr/textAppearanceLarge" />

        </LinearLayout>

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

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="#E3CF57"
                android:gravity="center"
                android:text="Expense Category"
                android:textSize="20sp"
                android:textStyle="italic|bold" />

            <TextView

                android:id="@+id/tvViewCategory"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="fill|center"
                android:padding="20dp"
                android:text="Large Text"
                android:textAppearance="?android:attr/textAppearanceLarge" />

        </LinearLayout>

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

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="#E3CF57"
                android:gravity="center"
                android:text="Time Recorded"
                android:textSize="20sp"
                android:textStyle="italic|bold" />

            <TextView

                android:id="@+id/tvViewTime"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="fill|center"
                android:padding="20dp"
                android:text="Large Text"
                android:textAppearance="?android:attr/textAppearanceLarge" />

        </LinearLayout>


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

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="#E3CF57"
                android:gravity="center"
                android:text="Comments"
                android:textSize="20sp"
                android:textStyle="italic|bold" />

            <TextView

                android:id="@+id/tvViewComment"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="fill|center"
                android:padding="20dp"
                android:text="Large Text"
                android:textAppearance="?android:attr/textAppearanceLarge" />

        </LinearLayout>


    </LinearLayout>


</ScrollView>

Answer 1

无法发表评论，但我在您的 xml 中看到的是您没有正确关闭。您需要以 </Scrollview> 结束而不是</LinearLayout> 。还要确保 ScrollView 只托管一个 View ，因此只需用relativelayout 包装您的 LinearLayout-Views 即可。

尝试一下，看看是否打开对话框。