android_alertDialog

主文件

package cn.com.sxp;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class AlertDialogActivity extends Activity implements OnClickListener {
    private Button btnOne = null;
    private Button btnTwo = null;
    private Button btnThree = null;
    private AlertDialog.Builder builder = null;
    private AlertDialog alert = null;
    final CharSequence[] items = {"红", "绿", "蓝"}; 

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

        btnOne = (Button) findViewById(R.id.btnOne);
        btnTwo = (Button) findViewById(R.id.btnTwo);
        btnThree = (Button) findViewById(R.id.btnThree);

        btnOne.setOnClickListener(this);
        btnTwo.setOnClickListener(this);
        btnThree.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.btnOne:
            // Builder构造函数
            // Constructor using a context for this builder and the AlertDialog it creates. 
            builder = new AlertDialog.Builder(this);
            // setMessage:
            // Set the message to display.
            builder.setMessage("我乃石大虾")
            // setCancelable
            // Sets whether the dialog is cancelable or not. Default is true.
                   .setCancelable(false)
                   // setPositiveButton
                   // Set a listener to be invoked when the positive button of the dialog is pressed.
                   .setPositiveButton("是", new DialogInterface.OnClickListener() {
                       public void onClick(DialogInterface dialog, int id) {
                           AlertDialogActivity.this.finish();
                       }
                   })
                   .setNegativeButton("不", new DialogInterface.OnClickListener() {
                       public void onClick(DialogInterface dialog, int id) {
                            dialog.cancel();
                       }
                   });
            alert = builder.create();
            alert.show();
            break;
        case R.id.btnTwo:
            builder = new AlertDialog.Builder(this);
            builder.setTitle("请选择一种颜色");
            // setItems
            // Set a list of items to be displayed in the dialog as the content, you will be notified of the selected item via the supplied listener.
            builder.setItems(items, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int item) {
                    Toast.makeText(getApplicationContext(), items[item], Toast.LENGTH_SHORT).show();
                }
            });
            alert = builder.create();
            alert.show();
            break;
        case R.id.btnThree:
            builder = new AlertDialog.Builder(this);
            builder.setTitle("请选择一种颜色,与上面不一样");
            // setSingleChoiceItems
            // Set a list of items to be displayed in the dialog as the content, you will be notified of the selected item via the supplied listener. The list
            // will have a check mark displayed to the right of the text for the checked item. Clicking on an item in the list will not dismiss the dialog. 
            // Clicking on a button will dismiss the dialog.
            // -1表示没有相被选择
            // builder.setMultiChoiceItems(items, -1, listener)
            builder.setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int item) {
                    Toast.makeText(getApplicationContext(), items[item], Toast.LENGTH_SHORT).show();
                }
            });
            alert = builder.create();
            alert.show();
        default:

        }
    }
}

XML文件

<?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" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/btnOne"
        android:text="一般" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/btnTwo"
        android:text="列表" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/btnThree"
        android:text="可选" />

</LinearLayout>

运行效果：

点击一;

点击二;

点击三