iOS转安卓：AlertDialog#学浪计划#抖青有文化

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package jay.com.alertdialogdemo; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; import android.widget.Toast; public class MainActivity extends AppCompatActivity implements View.OnClickListener { private Button btn_dialog_one; private Button btn_dialog_two; private Button btn_dialog_three; private Button btn_dialog_four; private Context mContext; private boolean[] checkItems; private AlertDialog alert = null; private AlertDialog.Builder builder = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mContext = MainActivity.this; bindView(); } private void bindView() { btn_dialog_one = (Button) findViewById(R.id.btn_dialog_one); btn_dialog_two = (Button) findViewById(R.id.btn_dialog_two); btn_dialog_three = (Button) findViewById(R.id.btn_dialog_three); btn_dialog_four = (Button) findViewById(R.id.btn_dialog_four); btn_dialog_one.setOnClickListener(this); btn_dialog_two.setOnClickListener(this); btn_dialog_three.setOnClickListener(this); btn_dialog_four.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { //普通对话框 case R.id.btn_dialog_one: alert = null; builder = new AlertDialog.Builder(mContext); alert = builder.setIcon(R.mipmap.ic_icon_fish) .setTitle("系统提示：") .setMessage("这是一个最普通的AlertDialog,\n带有三个按钮，分别是取消，中立和确定") .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(mContext, "你点击了取消按钮~", Toast.LENGTH_SHORT).show(); } }) .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(mContext, "你点击了确定按钮~", Toast.LENGTH_SHORT).show(); } }) .setNeutralButton("中立", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(mContext, "你点击了中立按钮~", Toast.LENGTH_SHORT).show(); } }).create(); //创建AlertDialog对象 alert.show(); //显示对话框 break; //普通列表对话框 case R.id.btn_dialog_two: final String[] lesson = new String[]{"语文", "数学", "英语", "化学", "生物", "物理", "体育"}; alert = null; builder = new AlertDialog.Builder(mContext); alert = builder.setIcon(R.mipmap.ic_icon_fish) .setTitle("选择你喜欢的课程") .setItems(lesson, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(getApplicationContext(), "你选择了" + lesson[which], Toast.LENGTH_SHORT).show(); } }).create(); alert.show(); break; //单选列表对话框 case R.id.btn_dialog_three: final String[] fruits = new String[]{"苹果", "雪梨", "香蕉", "葡萄", "西瓜"}; alert = null; builder = new AlertDialog.Builder(mContext); alert = builder.setIcon(R.mipmap.ic_icon_fish) .setTitle("选择你喜欢的水果，只能选一个哦~") .setSingleChoiceItems(fruits, 0, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(getApplicationContext(), "你选择了" + fruits[which], Toast.LENGTH_SHORT).show(); } }).create(); alert.show(); break; //多选列表对话框 case R.id.btn_dialog_four: final String[] menu = new String[]{"水煮豆腐", "萝卜牛腩", "酱油鸡", "胡椒猪肚鸡"}; //定义一个用来记录个列表项状态的boolean数组 checkItems = new boolean[]{false, false, false, false}; alert = null; builder = new AlertDialog.Builder(mContext); alert = builder.setIcon(R.mipmap.ic_icon_fish) .setMultiChoiceItems(menu, checkItems, new DialogInterface.OnMultiChoiceClickListener() { @Override public void onClick(DialogInterface dialog, int which, boolean isChecked) { checkItems[which] = isChecked; } }) .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { String result = ""; for (int i = 0; i < checkItems.length; i++) { if (checkItems[i]) result += menu[i] + " "; } Toast.makeText(getApplicationContext(), "客官你点了:" + result, Toast.LENGTH_SHORT).show(); } }) .setCancelable(false) .create(); alert.show(); break; } } } 

本节继续给大家带来是显示提示信息的第三个控件AlertDialog(对话框)，同时它也是其他 Dialog的的父类！比如ProgressDialog，TimePickerDialog等，而AlertDialog的父类是：Dialog！ 另外，不像前面学习的Toast和Notification，AlertDialog并不能直接new出来，如果你打开 AlertDialog的源码，会发现构造方法是protected的，如果我们要创建AlertDialog的话，我们 需要使用到该类中的一个静态内部类：public static class Builder，然后来调用AlertDialog 里的相关方法，来对AlertDialog进行定制，最后调用show()方法来显示我们的AlertDialog对话框！ 好的，下面我们就来学习AlertDialog的基本用法，以及定制我们的AlertDialog！ 官方文档：AlertDialog

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="jay.com.alertdialogdemo" > <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest> 

记录成长过程