Android學習：AlertDialog對話框

 

AlertDialog能夠生成各類內容的對話框，它生成的對話框包含4個區域：
圖標區，標題區，內容區，按鈕區

 

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="allegro.alertdialog.MainActivity"
    tools:layout_editor_absoluteY="81dp"
    tools:layout_editor_absoluteX="0dp">

    <!-- 顯示一個普通的文本編輯框組件 -->
    <EditText
        android:id="@+id/show"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:editable="false"
        android:layout_marginRight="8dp"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_marginLeft="8dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="8dp"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintLeft_creator="1" />

    <!-- 定義一個普通的按鈕組件 -->
    <Button
        android:layout_width="88dp"
        android:layout_height="wrap_content"
        android:text="簡單對話框"
        android:onClick="simple"
        android:id="@+id/button"
        android:layout_marginEnd="26dp"
        app:layout_constraintRight_toLeftOf="@+id/button2"
        tools:layout_constraintTop_creator="1"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintBottom_creator="1"
        app:layout_constraintBottom_toTopOf="@+id/button2"
        app:layout_constraintTop_toTopOf="@+id/button2" />

    <!-- 定義一個普通的按鈕組件 -->
    <Button
        android:layout_width="88dp"
        android:layout_height="wrap_content"
        android:text="簡單列表項對話框"
        android:onClick="simpleList"
        android:id="@+id/button4"
        android:layout_marginStart="16dp"
        tools:layout_constraintTop_creator="1"
        android:layout_marginTop="52dp"
        app:layout_constraintTop_toBottomOf="@+id/button3"
        tools:layout_constraintLeft_creator="1"
        app:layout_constraintLeft_toLeftOf="@+id/button3" />

    <!-- 定義一個普通的按鈕組件 -->
    <Button
        android:layout_width="88dp"
        android:layout_height="wrap_content"
        android:text="單選列表項對話框"
        android:onClick="singleChoice"
        android:layout_marginEnd="36dp"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintBottom_creator="1"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_marginBottom="191dp" />

    <!-- 定義一個普通的按鈕組件 -->
    <Button
        android:layout_width="88dp"
        android:layout_height="wrap_content"
        android:text="多選列表項對話框"
        android:onClick="multiChoice"
        tools:layout_constraintTop_creator="1"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintBottom_creator="1"
        app:layout_constraintBottom_toTopOf="@+id/button2"
        android:layout_marginEnd="16dp"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="@+id/button2" />

    <!-- 定義一個普通的按鈕組件 -->
    <Button
        android:layout_width="88dp"
        android:layout_height="wrap_content"
        android:text="自定義列表項對話框"
        android:onClick="customList"
        android:id="@+id/button2"
        android:layout_marginStart="6dp"
        tools:layout_constraintBottom_creator="1"
        app:layout_constraintBottom_toTopOf="@+id/button3"
        tools:layout_constraintLeft_creator="1"
        android:layout_marginBottom="9dp"
        app:layout_constraintLeft_toRightOf="@+id/button3" />

    <!-- 定義一個普通的按鈕組件 -->
    <Button
        android:layout_width="88dp"
        android:layout_height="wrap_content"
        android:text="自定義View對話框"
        android:onClick="customView"
        android:id="@+id/button3"
        android:layout_marginStart="78dp"
        tools:layout_constraintTop_creator="1"
        android:layout_marginTop="186dp"
        tools:layout_constraintLeft_creator="1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

 

 

package allegro.alertdialog;

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.TableLayout;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    TextView show;
    String[] items = new String[] {
            "瘋狂Java講義", "瘋狂Ajax講義",
            "輕量級Java EE企業應用實戰",
            "瘋狂Android講義" };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        show = (TextView) findViewById(R.id.show);
    }

    public void simple(View source)
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(this)
                // 設置對話框標題
                .setTitle("簡單對話框")
                // 設置圖標
                .setIcon(R.drawable.tools)
                .setMessage("對話框的測試內容\n第二行內容");
        // 爲AlertDialog.Builder添加「肯定」按鈕
        setPositiveButton(builder);
        // 爲AlertDialog.Builder添加「取消」按鈕
        setNegativeButton(builder)
                .create()
                .show();
    }

    public void simpleList(View source)
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(this)
                // 設置對話框標題
                .setTitle("簡單列表對話框")
                // 設置圖標
                .setIcon(R.drawable.tools)
                // 設置簡單的列表項內容
                .setItems(items, new DialogInterface.OnClickListener()
                {
                    @Override
                    public void onClick(DialogInterface dialog, int which)
                    {
                        show.setText("你選中了《" + items[which] + "》");
                    }
                });
        // 爲AlertDialog.Builder添加「肯定」按鈕
        setPositiveButton(builder);
        // 爲AlertDialog.Builder添加「取消」按鈕
        setNegativeButton(builder)
                .create()
                .show();
    }

    public void singleChoice(View source)
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(this)
                // 設置對話框標題
                .setTitle("單選列表項對話框")
                // 設置圖標
                .setIcon(R.drawable.tools)
                // 設置單選列表項，默認選中第二項（索引爲1）
                .setSingleChoiceItems(items, 1, new DialogInterface.OnClickListener()
                {
                    @Override
                    public void onClick(DialogInterface dialog, int which)
                    {
                        show.setText("你選中了《" + items[which] + "》");
                    }
                });
        // 爲AlertDialog.Builder添加「肯定」按鈕
        setPositiveButton(builder);
        // 爲AlertDialog.Builder添加「取消」按鈕
        setNegativeButton(builder)
                .create()
                .show();
    }

    public void multiChoice(View source)
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(this)
                // 設置對話框標題
                .setTitle("多選列表項對話框")
                // 設置圖標
                .setIcon(R.drawable.tools)
                // 設置多選列表項，設置勾選第2項、第4項
                .setMultiChoiceItems(items
                        , new boolean[]{false , true ,false ,true}, null);
        // 爲AlertDialog.Builder添加「肯定」按鈕
        setPositiveButton(builder);
        // 爲AlertDialog.Builder添加「取消」按鈕
        setNegativeButton(builder)
                .create()
                .show();
    }

    public void customList(View source)
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(this)
                // 設置對話框標題
                .setTitle("自定義列表項對話框")
                // 設置圖標
                .setIcon(R.drawable.tools)
                // 設置自定義列表項
                .setAdapter(new ArrayAdapter<String>(this
                        , R.layout.array_item
                        , items), null);
        // 爲AlertDialog.Builder添加「肯定」按鈕
        setPositiveButton(builder);
        // 爲AlertDialog.Builder添加「取消」按鈕
        setNegativeButton(builder)
                .create()
                .show();
    }

    public void customView(View source)
    {
        // 裝載app\src\main\res\layout\login.xml界面佈局文件
        TableLayout loginForm = (TableLayout)getLayoutInflater()
                .inflate( R.layout.login, null);
        new AlertDialog.Builder(this)
                // 設置對話框的圖標
                .setIcon(R.drawable.tools)
                // 設置對話框的標題
                .setTitle("自定義View對話框")
                // 設置對話框顯示的View對象
                .setView(loginForm)
                // 爲對話框設置一個「肯定」按鈕
                .setPositiveButton("登陸", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog,
                                        int which) {
                        // 此處可執行登陸處理
                    }
                })
                // 爲對話框設置一個「取消」按鈕
                .setNegativeButton("取消", new DialogInterface.OnClickListener()
                {
                    @Override
                    public void onClick(DialogInterface dialog,
                                        int which)
                    {
                        // 取消登陸，不作任何事情
                    }
                })
                // 建立並顯示對話框
                .create()
                .show();
    }


    private AlertDialog.Builder setPositiveButton(
            AlertDialog.Builder builder)
    {
        // 調用setPositiveButton方法添加「肯定」按鈕
        return builder.setPositiveButton("肯定", new DialogInterface.OnClickListener()
        {
            @Override
            public void onClick(DialogInterface dialog, int which)
            {
                show.setText("單擊了【肯定】按鈕！");
            }
        });
    }
    private AlertDialog.Builder setNegativeButton(
            AlertDialog.Builder builder)
    {
        // 調用setNegativeButton方法添加「取消」按鈕
        return builder.setNegativeButton("取消", new DialogInterface.OnClickListener()
        {
            @Override
            public void onClick(DialogInterface dialog, int which)
            {
                show.setText("單擊了【取消】按鈕！");
            }
        });
    }

}