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对话框详解0

简介: 对话框是人机交互的重要组成部分,android中使用AlertDialog.Builder类来创建对话框,本文详解了各种对话框的创建方法: ps:本文采用activity托管的方式来创建对话框,即使用onCreateDialog方法来创建。

对话框是人机交互的重要组成部分,android中使用AlertDialog.Builder类来创建对话框,本文详解了各种对话框的创建方法:

ps:本文采用activity托管的方式来创建对话框,即使用onCreateDialog方法来创建。当调用Activity类的showDialog方法时,系统会调用onCreateDialog方法来返回一个dialog,即showDialog将参数传进onCreateDialog方法。如果使用一般的创建方法,则和程序方法里面的做法相同。





main.xml布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" android:layout_width="fill_parent"
	android:layout_height="fill_parent">
	<Button android:id="@+id/btnDeleteFile" android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:text="显示确认对话框" />
	<Button android:id="@+id/btnSimpleList" android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:text="显示简单列表对话框" />
	<Button android:id="@+id/btnSingleChoiceList"
		android:layout_width="fill_parent" android:layout_height="wrap_content"
		android:text="显示单选列表对话框" />
	<Button android:id="@+id/btnMultiChoiceList"
		android:layout_width="fill_parent" android:layout_height="wrap_content"
		android:text="显示多选列表对话框" />
	<Button
	    android:id="@+id/customerDialog"
	    android:layout_width="match_parent"
	    android:layout_height="wrap_content"
	    android:text="显示自定义对话框" />

</LinearLayout>

自定义布局:

<?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
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="用户名:"
            android:textSize="20dp" />

        <EditText
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" />
    </LinearLayout>

    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="密    码:"
            android:textSize="20dp" />

        <EditText
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:password="true" />
    </LinearLayout>

</LinearLayout>

主程序:

public class Main extends Activity implements OnClickListener {
	private final int DIALOG_TWO_BUTTON = 1;
	private final int DIALOG_SIMPLE_LIST = 2;
	private final int DIALOG_SINGLE_CHOICE_LIST = 3;
	private final int DIALOG_MULTI_CHOICE_LIST = 4;
	private final int DIALOG_CUSTOMER_DIALOG = 5;
	private ListView lv = null;
	private String[] provinces = new String[] { "辽宁省", "山东省", "河北省", "福建省",
			"广东省", "黑龙江省" };
	//setSingleChoiceItems的响应事件
	private ButtonOnClick buttonOnClick = new ButtonOnClick(1);

	public void onClick(View view) {
		switch (view.getId()) {
		case R.id.btnDeleteFile:
			showDialog(DIALOG_TWO_BUTTON);
			break;
		case R.id.btnSimpleList:
			showDialog(DIALOG_SIMPLE_LIST);
			break;
		case R.id.btnSingleChoiceList:
			showDialog(DIALOG_SINGLE_CHOICE_LIST);
			break;
		case R.id.btnMultiChoiceList:
			showDialog(DIALOG_MULTI_CHOICE_LIST);
			break;
		case R.id.customerDialog:
			showDialog(DIALOG_CUSTOMER_DIALOG);
			break;
		}
	}

	@Override
	protected Dialog onCreateDialog(int id) {
		switch (id) {
		case DIALOG_TWO_BUTTON:
			return new AlertDialog.Builder(this)
					.setIcon(R.drawable.question)
					.setTitle("是否删除文件")
					//三个button  setNeutralButton()
					.setPositiveButton("确定",
							new DialogInterface.OnClickListener() {
								public void onClick(DialogInterface dialog,
										int whichButton) {
									new AlertDialog.Builder(Main.this)
											.setMessage("文件已经被删除.").create()
											.show();
								}
							})
					.setNegativeButton("取消",
							new DialogInterface.OnClickListener() {
								public void onClick(DialogInterface dialog,
										int whichButton) {

									new AlertDialog.Builder(Main.this)
											.setMessage("您已经选择了取消按钮,该文件未被删除.")
											.create().show();
								}
							}).create();

		case DIALOG_SIMPLE_LIST:
			return new AlertDialog.Builder(this).setTitle("选择省份")
					.setItems(provinces, new DialogInterface.OnClickListener() {
						public void onClick(DialogInterface dialog, int which) {
							final AlertDialog ad = new AlertDialog.Builder(
									Main.this)
									.setMessage(
											"您已经选择了: " + which + ":"
													+ provinces[which]).show();
							android.os.Handler hander = new android.os.Handler();
							hander.postDelayed(new Runnable() {
								public void run() {
									ad.dismiss();

								}
							}, 5 * 1000);

						}
					}).create();
		case DIALOG_SINGLE_CHOICE_LIST:
			return new AlertDialog.Builder(this).setTitle("选择省份")
					.setSingleChoiceItems(provinces, 1, buttonOnClick)
					.setPositiveButton("确定", buttonOnClick)
					.setNegativeButton("取消", buttonOnClick).create();
		case DIALOG_MULTI_CHOICE_LIST:
			AlertDialog ad = new AlertDialog.Builder(this)
					.setIcon(R.drawable.image)
					.setTitle("选择省份")
					.setMultiChoiceItems(
							provinces,
							new boolean[] { false, true, false, true, false,
									false },
							new DialogInterface.OnMultiChoiceClickListener() {
								public void onClick(DialogInterface dialog,
										int whichButton, boolean isChecked) {

								}
							})
					.setPositiveButton("确定",
							new DialogInterface.OnClickListener() {
								public void onClick(DialogInterface dialog,
										int whichButton) {
									int count = lv.getCount();
									String s = "您选择了:";
									for (int i = 0; i < provinces.length; i++) {

										if (lv.getCheckedItemPositions().get(i))
											s += i
													+ ":"
													+ lv.getAdapter()
															.getItem(i) + "  ";

									}
									if (lv.getCheckedItemPositions().size() > 0) {
										new AlertDialog.Builder(Main.this)
												.setMessage(s).show();
									} else {
										new AlertDialog.Builder(Main.this)
												.setMessage("您未选择任何省份").show();

									}

								}
							}).setNegativeButton("取消", null).create();
			lv = ad.getListView();
			return ad;

		case DIALOG_CUSTOMER_DIALOG:
			LinearLayout loginLayout = (LinearLayout) getLayoutInflater()
					.inflate(R.layout.login, null);
			new AlertDialog.Builder(this)
					.setIcon(R.drawable.image)
					.setTitle("用户登录")
					//通过setView方法设置自定义视图
					.setView(loginLayout)
					.setPositiveButton("登录",
							new DialogInterface.OnClickListener() {
								public void onClick(DialogInterface dialog,
										int whichButton) {
									// 编写处理用户登录的代码
								}
							})
					.setNegativeButton("取消",
							new DialogInterface.OnClickListener() {
								public void onClick(DialogInterface dialog,
										int whichButton) {
									// 取消用户登录,退出程序

								}
							}).show();
			break;
		}

		return null;
	}

	private class ButtonOnClick implements DialogInterface.OnClickListener
	{
		private int index;

		public ButtonOnClick(int index)
		{
			this.index = index;
		}

		public void onClick(DialogInterface dialog, int whichButton)
		{
			if (whichButton >= 0)
			{
				index = whichButton;
			}
			else
			{
				if (whichButton == DialogInterface.BUTTON_POSITIVE)
				{
					new AlertDialog.Builder(Main.this).setMessage(
							"您已经选择了: " + index + ":" + provinces[index]).show();
				}
				else if (whichButton == DialogInterface.BUTTON_NEGATIVE)
				{
					new AlertDialog.Builder(Main.this).setMessage("您什么都未选择.")
							.show();
				}
			}
		}
	}
	//调用show方法之前调用
	@Override
	protected void onPrepareDialog(int id, Dialog dialog)
	{
		super.onPrepareDialog(id, dialog);
	}

	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		Button btnDeleteFile = (Button) findViewById(R.id.btnDeleteFile);
		Button btnSimpleList = (Button) findViewById(R.id.btnSimpleList);
		Button btnSingleChoiceList = (Button) findViewById(R.id.btnSingleChoiceList);
		Button btnMultiChoiceList = (Button) findViewById(R.id.btnMultiChoiceList);
		Button customerDialog = (Button)findViewById(R.id.customerDialog);
		btnDeleteFile.setOnClickListener(this);
		btnSimpleList.setOnClickListener(this);
		btnSingleChoiceList.setOnClickListener(this);
		btnMultiChoiceList.setOnClickListener(this);
		customerDialog.setOnClickListener(this);
	}
}


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