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Android的AlertDialog详解


2013/5/29 12:46:45 编辑:admin 来源:本站整理 
今天给大家分享Android的AlertDialog详解电脑技术文章。喜欢的可以分享Android的AlertDialog详解给你的好友。

AlertDialog的构造方法全部是Protected的, 所以不能直接通过new一个AlertDialog来创建出一个AlertDialog。

喜欢电脑技术的网友不妨去看看下面的文章:
  • 要创建一个AlertDialog, 就要用到AlertDialog.Builder中的create()方法。

    使用AlertDialog.Builder创建对话框需要了解以下几个方法:

    setTitle :为对话框设置标题
    setIcon :为对话框设置图标
    setMessage:为对话框设置内容
    setView : 给对话框设置自定义样式
    setItems :设置对话框要显示的一个list, 一般用于显示几个命令时
    setMultiChoiceItems :用来设置对话框显示一系列的复选框
    setNeutralButton :普通按钮

    setPositiveButton :给对话框添加"Yes"按钮
    setNegativeButton :对话框添加"No"按钮
    create : 创建对话框
    show :显示对话框
    一、简单的AlertDialog

    下面, 创建一个简单的ALertDialog并显示它:


    [java] package com.tianjf;

    import android.app.Activity;
    import android.app.AlertDialog;
    import android.app.Dialog;
    import android.os.Bundle;

    public class Dialog_AlertDialogDemoActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Dialog alertDialog = new AlertDialog.Builder(this).
    setTitle("对话框的标题").
    setMessage("对话框的内容").
    setIcon(R.drawable.ic_launcher).
    create();
    alertDialog.show();
    }
    }
    package com.tianjf;

    import android.app.Activity;
    import android.app.AlertDialog;
    import android.app.Dialog;
    import android.os.Bundle;

    public class Dialog_AlertDialogDemoActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Dialog alertDialog = new AlertDialog.Builder(this).
    setTitle("对话框的标题").
    setMessage("对话框的内容").
    setIcon(R.drawable.ic_launcher).
    create();
    alertDialog.show();
    }
    }运行结果如下:


    ▼Android的AlertDialog详解\


    二、带按钮的AlertDialog

    上面的例子很简单, 下面我们在这个AlertDialog上面加几个Button, 实现删除操作的提示对话框


    [java] package com.tianjf;

    import android.app.Activity;
    import android.app.AlertDialog;
    import android.app.Dialog;
    import android.content.DialogInterface;
    import android.os.Bundle;

    public class Dialog_AlertDialogDemoActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Dialog alertDialog = new AlertDialog.Builder(this).
    setTitle("确定删除?").
    setMessage("您确定删除该条信息吗?").
    setIcon(R.drawable.ic_launcher).
    setPositiveButton("确定", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    }
    }).
    setNegativeButton("取消", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    }
    }).
    setNeutralButton("查看详情", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    }
    }).
    create();
    alertDialog.show();
    }
    }
    package com.tianjf;

    import android.app.Activity;
    import android.app.AlertDialog;
    import android.app.Dialog;
    import android.content.DialogInterface;
    import android.os.Bundle;

    public class Dialog_AlertDialogDemoActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Dialog alertDialog = new AlertDialog.Builder(this).
    setTitle("确定删除?").
    setMessage("您确定删除该条信息吗?").
    setIcon(R.drawable.ic_launcher).
    setPositiveButton("确定", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    }
    }).
    setNegativeButton("取消", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    }
    }).
    setNeutralButton("查看详情", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    }
    }).
    create();
    alertDialog.show();
    }
    }在这个例子中, 我们定义了三个按钮, 分别是"Yes"按钮, "No"按钮以及一个普通按钮, 每个按钮都有onClick事件, TODO的地方可以放点了按钮之后想要做的一些处理

    看一下运行结果:

    \


    可以看到三个按钮添加到了AlertDialog上, 三个没有添加事件处理的按钮, 点了只是关闭对话框, 没有任何其他操作。

    三、类似ListView的AlertDialog
    用setItems(CharSequence[] items, final OnClickListener listener)方法来实现类似ListView的AlertDialog

    第一个参数是要显示的数据的数组, 第二个参数是点击某个item的触发事件


    [java] package com.tianjf;

    import android.app.Activity;
    import android.app.AlertDialog;
    import android.app.Dialog;
    import android.content.DialogInterface;
    import android.os.Bundle;
    import android.widget.Toast;

    public class Dialog_AlertDialogDemoActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    final String[] arrayFruit = new String[] { "苹果", "橘子", "草莓", "香蕉" };

    Dialog alertDialog = new AlertDialog.Builder(this).
    setTitle("你喜欢吃哪种水果?").
    setIcon(R.drawable.ic_launcher)
    .setItems(arrayFruit, new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    Toast.makeText(Dialog_AlertDialogDemoActivity.this, arrayFruit[which], Toast.LENGTH_SHORT).show();
    }
    }).
    setNegativeButton("取消", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    }
    }).
    create();
    alertDialog.show();
    }
    }
    package com.tianjf;

    import android.app.Activity;
    import android.app.AlertDialog;
    import android.app.Dialog;
    import android.content.DialogInterface;
    import android.os.Bundle;
    import android.widget.Toast;

    public class Dialog_AlertDialogDemoActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    final String[] arrayFruit = new String[] { "苹果", "橘子", "草莓", "香蕉" };

    Dialog alertDialog = new AlertDialog.Builder(this).
    setTitle("你喜欢吃哪种水果?").
    setIcon(R.drawable.ic_launcher)
    .setItems(arrayFruit, new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    Toast.makeText(Dialog_AlertDialogDemoActivity.this, arrayFruit[which], Toast.LENGTH_SHORT).show();
    }
    }).
    setNegativeButton("取消", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    }
    }).
    create();
    alertDialog.show();
    }
    }运行结果如下:

    \

    四、类似RadioButton的AlertDialog
    用setSingleChoiceItems(CharSequence[] items, int checkedItem, final OnClickListener listener)方法来实现类似RadioButton的AlertDialog

    第一个参数是要显示的数据的数组, 第二个参数是初始值(初始被选中的item), 第三个参数是点击某个item的触发事件

    在这个例子里面我们设了一个selectedFruitIndex用来记住选中的item的index


    [java] package com.tianjf;

    import android.app.Activity;
    import android.app.AlertDialog;
    import android.app.Dialog;
    import android.content.DialogInterface;
    import android.os.Bundle;
    import android.widget.Toast;

    public class Dialog_AlertDialogDemoActivity extends Activity {

    private int selectedFruitIndex = 0;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    final String[] arrayFruit = new String[] { "苹果", "橘子", "草莓", "香蕉" };

    Dialog alertDialog = new AlertDialog.Builder(this).
    setTitle("你喜欢吃哪种水果?").
    setIcon(R.drawable.ic_launcher)
    .setSingleChoiceItems(arrayFruit, 0, new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    selectedFruitIndex = which;
    }
    }).
    setPositiveButton("确认", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    Toast.makeText(Dialog_AlertDialogDemoActivity.this, arrayFruit[selectedFruitIndex], Toast.LENGTH_SHORT).show();
    }
    }).
    setNegativeButton("取消", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    }
    }).
    create();
    alertDialog.show();
    }
    }
    package com.tianjf;

    import android.app.Activity;
    import android.app.AlertDialog;
    import android.app.Dialog;
    import android.content.DialogInterface;
    import android.os.Bundle;
    import android.widget.Toast;

    public class Dialog_AlertDialogDemoActivity extends Activity {

    private int selectedFruitIndex = 0;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    final String[] arrayFruit = new String[] { "苹果", "橘子", "草莓", "香蕉" };

    Dialog alertDialog = new AlertDialog.Builder(this).
    setTitle("你喜欢吃哪种水果?").
    setIcon(R.drawable.ic_launcher)
    .setSingleChoiceItems(arrayFruit, 0, new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    selectedFruitIndex = which;
    }
    }).
    setPositiveButton("确认", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    Toast.makeText(Dialog_AlertDialogDemoActivity.this, arrayFruit[selectedFruitIndex], Toast.LENGTH_SHORT).show();
    }
    }).
    setNegativeButton("取消", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    }
    }).
    create();
    alertDialog.show();
    }
    }

    运行结果如下:

    \`


    五、类似CheckBox的AlertDialog
    用setMultiChoiceItems(CharSequence[] items, boolean[] checkedItems, final OnMultiChoiceClickListener listener)方法来实现类似CheckBox的AlertDialog
    第一个参数是要显示的数据的数组, 第二个参数是选中状态的数组, 第三个参数是点击某个item的触发事件


    [java] package com.tianjf;

    import android.app.Activity;
    import android.app.AlertDialog;
    import android.app.Dialog;
    import android.content.DialogInterface;
    import android.os.Bundle;
    import android.widget.Toast;

    public class Dialog_AlertDialogDemoActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    final String[] arrayFruit = new String[] { "苹果", "橘子", "草莓", "香蕉" };
    final boolean[] arrayFruitSelected = new boolean[] {true, true, false, false};

    Dialog alertDialog = new AlertDialog.Builder(this).
    setTitle("你喜欢吃哪种水果?").
    setIcon(R.drawable.ic_launcher)
    .setMultiChoiceItems(arrayFruit, arrayFruitSelected, new DialogInterface.OnMultiChoiceClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
    arrayFruitSelected[which] = isChecked;
    }
    }).
    setPositiveButton("确认", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    StringBuilder stringBuilder = new StringBuilder();
    for (int i = 0; i < arrayFruitSelected.length; i++) {
    if (arrayFruitSelected[i] == true)
    {
    stringBuilder.append(arrayFruit[i] + "、");
    }
    }
    Toast.makeText(Dialog_AlertDialogDemoActivity.this, stringBuilder.toString(), Toast.LENGTH_SHORT).show();
    }
    }).
    setNegativeButton("取消", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    }
    }).
    create();
    alertDialog.show();
    }
    }
    package com.tianjf;

    import android.app.Activity;
    import android.app.AlertDialog;
    import android.app.Dialog;
    import android.content.DialogInterface;
    import android.os.Bundle;
    import android.widget.Toast;

    public class Dialog_AlertDialogDemoActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    final String[] arrayFruit = new String[] { "苹果", "橘子", "草莓", "香蕉" };
    final boolean[] arrayFruitSelected = new boolean[] {true, true, false, false};

    Dialog alertDialog = new AlertDialog.Builder(this).
    setTitle("你喜欢吃哪种水果?").
    setIcon(R.drawable.ic_launcher)
    .setMultiChoiceItems(arrayFruit, arrayFruitSelected, new DialogInterface.OnMultiChoiceClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
    arrayFruitSelected[which] = isChecked;
    }
    }).
    setPositiveButton("确认", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    StringBuilder stringBuilder = new StringBuilder();
    for (int i = 0; i < arrayFruitSelected.length; i++) {
    if (arrayFruitSelected[i] == true)
    {
    stringBuilder.append(arrayFruit[i] + "、");
    }
    }
    Toast.makeText(Dialog_AlertDialogDemoActivity.this, stringBuilder.toString(), Toast.LENGTH_SHORT).show();
    }
    }).
    setNegativeButton("取消", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    }
    }).
    create();
    alertDialog.show();
    }
    }运行结果如下:

    \

    六、自定义View的AlertDialog
    有时候我们不能满足系统自带的AlertDialog风格, 就比如说我们要实现一个Login画面, 有用户名和密码, 这时我们就要用到自定义View的AlertDialog

    先创建Login画面的布局文件

    [html] <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android";
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center" >

    <TextView
    android:layout_width="0dip"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:text="@string/user" />

    <EditText
    android:layout_width="0dip"
    android:layout_height="wrap_content"
    android:layout_weight="1" />
    </LinearLayout>

    <LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center" >

    <TextView
    android:layout_width="0dip"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:text="@string/passward" />

    <EditText
    android:layout_width="0dip"
    android:layout_height="wrap_content"
    android:layout_weight="1" />
    </LinearLayout>

    </LinearLayout>
    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android";
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center" >

    <TextView
    android:layout_width="0dip"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:text="@string/user" />

    <EditText
    android:layout_width="0dip"
    android:layout_height="wrap_content"
    android:layout_weight="1" />
    </LinearLayout>

    <LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center" >

    <TextView
    android:layout_width="0dip"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:text="@string/passward" />

    <EditText
    android:layout_width="0dip"
    android:layout_height="wrap_content"
    android:layout_weight="1" />
    </LinearLayout>

    </LinearLayout>
    然后在Activity里面把Login画面的布局文件添加到AlertDialog上

    [java] package com.tianjf;

    import android.app.Activity;
    import android.app.AlertDialog;
    import android.app.Dialog;
    import android.content.DialogInterface;
    import android.os.Bundle;
    import android.view.LayoutInflater;
    import android.view.View;

    public class Dialog_AlertDialogDemoActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    // 取得自定义View
    LayoutInflater layoutInflater = LayoutInflater.from(this);
    View myLoginView = layoutInflater.inflate(R.layout.login, null);

    Dialog alertDialog = new AlertDialog.Builder(this).
    setTitle("用户登录").
    setIcon(R.drawable.ic_launcher).
    setView(myLoginView).
    setPositiveButton("登录", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    }
    }).
    setNegativeButton("取消", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    }
    }).
    create();
    alertDialog.show();
    }
    }
    package com.tianjf;

    import android.app.Activity;
    import android.app.AlertDialog;
    import android.app.Dialog;
    import android.content.DialogInterface;
    import android.os.Bundle;
    import android.view.LayoutInflater;
    import android.view.View;

    public class Dialog_AlertDialogDemoActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    // 取得自定义View
    LayoutInflater layoutInflater = LayoutInflater.from(this);
    View myLoginView = layoutInflater.inflate(R.layout.login, null);

    Dialog alertDialog = new AlertDialog.Builder(this).
    setTitle("用户登录").
    setIcon(R.drawable.ic_launcher).
    setView(myLoginView).
    setPositiveButton("登录", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    }
    }).
    setNegativeButton("取消", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    }
    }).
    create();
    alertDialog.show();
    }
    }运行结果如下:

    \





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