安卓开发：四种对话框

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="click1"
        android:text="普通对话框" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="click2"
        android:text="单选对话框" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="click3"
        android:text="多选对话框" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="click4"
        android:text="进度条对话框" />

</LinearLayout>

package org.dreamtech.dialog;

import android.os.Bundle;
import android.os.SystemClock;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.DialogInterface.OnMultiChoiceClickListener;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    // 普通对话框
    public void click1(View v) {
        AlertDialog.Builder builder = new Builder(this);
        builder.setTitle("对话框标题");
        builder.setMessage("对话框内容");
        builder.setPositiveButton("确认", new OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(getApplicationContext(), "点击了确定按钮",
                        Toast.LENGTH_LONG).show();
            }
        });
        builder.setNegativeButton("取消", new OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(getApplicationContext(), "点击了取消按钮",
                        Toast.LENGTH_LONG).show();
            }
        });
        builder.show();
    }

    // 单选对话框
    public void click2(View v) {
        AlertDialog.Builder builder = new Builder(this);
        builder.setTitle("对话框标题");
        final String items[] = { "选项1", "选项2", "选项3" };
        builder.setSingleChoiceItems(items, -1, new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                String item = items[which];
                Toast.makeText(getApplicationContext(), "选中" + item,
                        Toast.LENGTH_LONG).show();
                dialog.dismiss();
            }
        });
        builder.show();
    }

    // 多选对话框
    public void click3(View v) {
        AlertDialog.Builder builder = new Builder(this);
        builder.setTitle("对话框标题");
        final String items[] = { "选项1", "选项2", "选项3" };
        final boolean checkItems[] = { false, false, false };
        builder.setMultiChoiceItems(items, checkItems,
                new OnMultiChoiceClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which,
                            boolean isChecked) {

                    }
                });
        builder.setPositiveButton("确定", new OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                StringBuffer sb = new StringBuffer();
                for (int i = 0; i < checkItems.length; i++) {
                    if (checkItems[i]) {
                        String choice = items[i];
                        sb.append(choice + " ");
                    }
                }
                Toast.makeText(getApplicationContext(), "选中" + sb.toString(),
                        Toast.LENGTH_LONG).show();
                dialog.dismiss();
            }
        });
        builder.show();
    }

    // 进度条对话框
    public void click4(View v) {
        final ProgressDialog dialog = new ProgressDialog(this);
        dialog.setTitle("正在加载");
        dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        dialog.show();
        new Thread() {
            public void run() {
                dialog.setMax(100);
                for (int i = 0; i <= 100; i++) {
                    dialog.setProgress(i);
                    SystemClock.sleep(50);
                }
                dialog.dismiss();
            };
        }.start();
    }
}