基于Java语言的Android开发从入门到精通明日科技图书源码

package com.mingrisoft; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Toast; public class MainActivity extends AppCompatActivity { private boolean[] checkedItems;//记录各列表项的状态 private String[] items;//各列表项要显示的内容 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button button1 = (Button) findViewById(R.id.button1); // 获取“显示带取消、确定按钮的对话框”按钮 // 为“显示带取消、确定按钮的对话框”按钮添加单击事件监听器 button1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //创建对话框对象 AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create(); alertDialog.setIcon(R.drawable.advise); //设置对话框的图标 alertDialog.setTitle("乔布斯:"); //设置对话框的标题 alertDialog.setMessage("活着就是为了改变世界，难道还有其他原因吗？"); //设置要显示的内容 //添加取消按钮 alertDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "否", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(MainActivity.this, "您单击了否按钮", Toast.LENGTH_SHORT).show(); } }); //添加确定按钮 alertDialog.setButton(DialogInterface.BUTTON_POSITIVE, "是", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(MainActivity.this, "您单击了是按钮 ", Toast.LENGTH_SHORT).show(); } }); alertDialog.show(); //显示对话框 } }); Button button2 = (Button) findViewById(R.id.button2); // 获取“显示带列表的对话框”按钮 button2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //创建名言字符串数组 final String[] items = new String[]{"当你有使命，它会让你更专注", "要么出众，要么出局", "活着就是为了改变世界", "求知若饥，虚心若愚"}; //创建列表对话框对象 AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setIcon(R.drawable.advise1); //设置对话框的图标 builder.setTitle("请选择你喜欢的名言："); //设置对话框的标题 //添加列表项 builder.setItems(items, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(MainActivity.this, "您选择了" + items[which], Toast.LENGTH_SHORT).show(); } }); builder.create().show(); // 创建对话框并显示 } }); Button button3 = (Button) findViewById(R.id.button3); // 获取“显示带单选列表项的对话框”按钮 button3.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //创建名字字符串数组 final String[] items = new String[]{"扎克伯格", "乔布斯", "拉里.埃里森", "安迪.鲁宾", "马云"}; // 显示带单选列表项的对话框 AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setIcon(R.drawable.advise2); //设置对话框的图标 builder.setTitle("如果让你选择，你最想做哪一个："); //设置对话框的标题 builder.setSingleChoiceItems(items, 0, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(MainActivity.this, "您选择了" + items[which], Toast.LENGTH_SHORT).show(); //显示选择结果 } }); builder.setPositiveButton("确定", null); //添加确定按钮 builder.create().show(); // 创建对话框并显示 } }); Button button4 = (Button) findViewById(R.id.button4); // 获取“显示带多选列表项的对话框”按钮 button4.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { checkedItems = new boolean[]{false, true, false, true, false}; //记录各列表项的状态 //各列表项要显示的内容 items = new String[]{"开心消消乐", "球球大作战", "欢乐斗地主", "梦幻西游", "超级玛丽"}; // 显示带单选列表项的对话框 AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setIcon(R.drawable.advise2); //设置对话框的图标 builder.setTitle("请选择您喜爱的游戏："); //设置对话框标题 builder.setMultiChoiceItems(items, checkedItems, new DialogInterface.OnMultiChoiceClickListener() { @Override public void onClick(DialogInterface dialog, int which, boolean isChecked) { checkedItems[which] = isChecked; //改变被操作列表项的状态 } }); //为对话框添加“确定”按钮 builder.setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { String result = ""; for (int i = 0; i < checkedItems.length; i++) { if (checkedItems[i]) { //当选项被选择时 result += items[i] + "、"; //将选项的内容添加到result中 } } //当result不为空时，通过消息提示框显示选择的结果 if (!"".equals(result)) { result = result.substring(0, result.length() - 1); //去掉最后面添加的“、”号 Toast.makeText(MainActivity.this, "您选择了[ " + result + " ]", Toast.LENGTH_LONG).show(); } } }); builder.create().show(); // 创建对话框并显示 } }); } }