几种对话框和菜单

package com.example.ADemo4;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.graphics.Color;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MyActivity extends Activity {
    public static final int RED_MENU_ID = Menu.FIRST;
    public static final int GREEN_MENU_ID = Menu.FIRST + 1;
    public static final int BLUE_MENU_ID = Menu.FIRST + 2;

    private Button mButton;

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

        mButton = (Button) findViewById(R.id.button);
        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                (new AlertDialog.Builder(MyActivity.this)).setMessage("确定是否退出程序")
                        .setTitle("普通对话框")
                        .setCancelable(false)
                        .setPositiveButton("确定退出", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {
                                //To change body of implemented methods use File | Settings | File Templates.
                                MyActivity.this.finish();
                            }
                        })
                        .setNegativeButton("取消推出", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {
                                dialogInterface.cancel();
                            }
                        })
                        .create()
                        .show();
            }
        });

        Button button1 = (Button) findViewById(R.id.button1);
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                (new AlertDialog.Builder(MyActivity.this))
                        .setTitle("对话框头部")
                        .setTitle("List对话框")
                        .setItems(R.array.select_dialog_items, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int which) {
                                String[] items =
                                        getResources().getStringArray(R.array.select_dialog_items);
                                new AlertDialog.Builder(MyActivity.this)
                                        .setMessage("You selected: " + which + " , " + items[which])
                                        .show();

                            }
                        }).create()
                        .show();
            }
        });

        Button button2 = (Button) findViewById(R.id.button2);
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                (new AlertDialog.Builder(MyActivity.this))
                        .setTitle("对话框头部")
                        .setTitle("Radio对话框")
                        .setSingleChoiceItems(R.array.select_dialog_items, 0, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int which) {
                                String[] items =
                                        getResources().getStringArray(R.array.select_dialog_items);
                                new AlertDialog.Builder(MyActivity.this)
                                        .setMessage("You selected: " + which + " , " + items[which])
                                        .show();

                            }
                        }).create()
                        .show();
            }
        });

        Button button3 = (Button) findViewById(R.id.button3);
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                (new AlertDialog.Builder(MyActivity.this))
                        .setTitle("对话框头部")
                        .setTitle("Check对话框")
                        .setMultiChoiceItems(R.array.select_dialog_items,
                                new boolean[]{false, true, false, true},
                                new DialogInterface.OnMultiChoiceClickListener() {
                                    @Override
                                    public void onClick(DialogInterface dialogInterface, int i, boolean b) {
                                        Toast toast = Toast.makeText(MyActivity.this, i + ":" + b, Toast.LENGTH_SHORT);
                                        toast.show();
                                    }
                                })
                        .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int whichButton) {
                            }
                        })
                        .setNegativeButton("No", new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int whichButton) {
                            }
                        })

                        .create()
                        .show();
            }
        });

        LayoutInflater factory = LayoutInflater.from(this);
        final View textEntryView = factory.inflate(R.layout.dialog, null);

        Button button4 = (Button) findViewById(R.id.button4);
        button4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                (new AlertDialog.Builder(MyActivity.this))
                        .setTitle("对话框头部")
                        .setTitle("继承View对话框")
                        .setView(textEntryView)
                        .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int whichButton) {
                            }
                        })
                        .setNegativeButton("No", new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int whichButton) {
                            }
                        })

                        .create()
                        .show();
            }
        });
    }

    //创建菜单
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);    //To change body of overridden methods use File | Settings | File Templates.
        menu.add(0, RED_MENU_ID, 0, R.string.red);
        menu.add(0, GREEN_MENU_ID, 0, R.string.green);
        menu.add(0, BLUE_MENU_ID, 0, R.string.blue);
        return true;

    }
    //菜单事件
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case RED_MENU_ID:
                mButton.setBackgroundColor(Color.RED);
                mButton.setText(R.string.red);
                return true;
            case GREEN_MENU_ID:
                mButton.setBackgroundColor(Color.GREEN);
                mButton.setText(R.string.green);
                return true;
            case BLUE_MENU_ID:
                mButton.setBackgroundColor(Color.BLUE);
                mButton.setText(R.string.blue);
                return true;
        }
        return super.onOptionsItemSelected(item);

    }
}