Android开发手记(13) 几种Alertdialog的使用

　　本文主要讨论七种形式的AlertDialog，及其编写方法。

1、退出

　　在用户退出的时候提示用户是否退出，含有“确定”和“退出”两个按键。

        btnExit.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 final AlertDialog.Builder alertDlg = new AlertDialog.Builder(MainActivity.this);
                 alertDlg.setMessage("确定退出吗？");
                 alertDlg.setTitle("退出");
                 alertDlg.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                     @Override
                     public void onClick(DialogInterface dialogInterface, int i) {
                         MainActivity.this.finish();
                     }
                 });
                 alertDlg.setNegativeButton("取消", null);
                 alertDlg.show();
             }
         });    

2、调查图表

　　弹出对话框，让用户选择相应的按钮来获得用户选项。含有相应的提示问题。

 btnChart.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 AlertDialog.Builder alertDlg = new AlertDialog.Builder(MainActivity.this);
                 alertDlg.setIcon(android.R.drawable.btn_star);
                 alertDlg.setTitle("调查");
                 alertDlg.setMessage("你喜欢的颜色是？");
                 alertDlg.setPositiveButton("红色", new DialogInterface.OnClickListener() {
                     @Override
                     public void onClick(DialogInterface dialogInterface, int i) {
                         Toast.makeText(MainActivity.this, "你喜欢红色", Toast.LENGTH_SHORT);
                     }
                 });
                 alertDlg.setNegativeButton("蓝色", new DialogInterface.OnClickListener() {
                     @Override
                     public void onClick(DialogInterface dialogInterface, int i) {
                         Toast.makeText(MainActivity.this, "你喜欢蓝色", Toast.LENGTH_SHORT);
                     }
                 });
                 alertDlg.setNeutralButton("黄色", new DialogInterface.OnClickListener() {
                     @Override
                     public void onClick(DialogInterface dialogInterface, int i) {
                         Toast.makeText(MainActivity.this, "你喜欢黄色", Toast.LENGTH_SHORT);
                     }
                 });
                 alertDlg.show();
             }
         });

3、输入内容

　　弹出对话框，提示用户输入用户名或者密码，可以作登陆使用。

         btnContent.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 AlertDialog.Builder alertDlg = new AlertDialog.Builder(MainActivity.this);
                 alertDlg.setTitle("请输入");
                 alertDlg.setIcon(android.R.drawable.ic_dialog_info);
                 alertDlg.setView(new EditText(MainActivity.this)).setPositiveButton("确定", null);
                 alertDlg.setNegativeButton("取消", null);
                 alertDlg.show();
             }
         });    

4、单选按钮

　　对话框内含有一系列单选按钮让用户选择。

         btnRadio.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 new AlertDialog.Builder(MainActivity.this).setTitle("单选框")
                         .setIcon(android.R.drawable.ic_dialog_info)
                         .setSingleChoiceItems(new String[]{"红色", "蓝色", "黄色"}, 0, null)
                         .setPositiveButton("确定", null)
                         .setNegativeButton("取消", null).show();
             }
         });

5、多选按钮

　　对话框内含有一系列多选按钮让用户选择。

         btnCheckBox.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 new AlertDialog.Builder(MainActivity.this).setTitle("复选框")
                         .setIcon(android.R.drawable.ic_dialog_info)
                         .setMultiChoiceItems(new String[]{"红色", "蓝色", "黄色"}, null, null)
                         .setPositiveButton("确定", null)
                         .setNegativeButton("取消", null).show();
             }
         });

6、简单列表

　　含有一系列简单的列表，供用户点击，可以做菜单使用。

         btnList.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 new AlertDialog.Builder(MainActivity.this).setTitle("列表框")
                         .setIcon(android.R.drawable.ic_dialog_info)
                         .setItems(new String[]{"红色", "蓝色", "黄色"}, null)
                         .setPositiveButton("确定", null)
                         .setNegativeButton("取消", null).show();
             }
         });

7、自定义布局

　　可以自定义对话框显示内容，通过资源文件导入布局。

         btnCostume.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 LayoutInflater inflater = getLayoutInflater();
                 View layout = inflater.inflate(R.layout.activity_main,
                         (ViewGroup)findViewById(R.id.mainMenu));

                 new AlertDialog.Builder(MainActivity.this).setTitle("自定义布局")
                         .setView(layout)
                         .setPositiveButton("确定", null)
                         .setNegativeButton("取消", null).show();
             }
         });

8、完整代码：

 import android.app.AlertDialog;
 import android.app.Dialog;
 import android.content.DialogInterface;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.Toast;

 public class MainActivity extends AppCompatActivity {

     private Button btnExit;
     private Button btnChart;
     private Button btnContent;
     private Button btnRadio;
     private Button btnCheckBox;
     private Button btnList;
     private Button btnCostume;

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

         btnExit = (Button)findViewById(R.id.btnExit);
         btnChart = (Button)findViewById(R.id.btnChart);
         btnContent = (Button)findViewById(R.id.btnContent);
         btnRadio = (Button)findViewById(R.id.btnRadio);
         btnCheckBox = (Button)findViewById(R.id.btnCheckBox);
         btnList = (Button)findViewById(R.id.btnList);
         btnCostume = (Button)findViewById(R.id.btnCostume);

         btnExit.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 final AlertDialog.Builder alertDlg = new AlertDialog.Builder(MainActivity.this);
                 alertDlg.setMessage("确定退出吗？");
                 alertDlg.setTitle("退出");
                 alertDlg.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                     @Override
                     public void onClick(DialogInterface dialogInterface, int i) {
                         MainActivity.this.finish();
                     }
                 });
                 alertDlg.setNegativeButton("取消", null);
                 alertDlg.show();
             }
         });

         btnChart.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 AlertDialog.Builder alertDlg = new AlertDialog.Builder(MainActivity.this);
                 alertDlg.setIcon(android.R.drawable.btn_star);
                 alertDlg.setTitle("调查");
                 alertDlg.setMessage("你喜欢的颜色是？");
                 alertDlg.setPositiveButton("红色", new DialogInterface.OnClickListener() {
                     @Override
                     public void onClick(DialogInterface dialogInterface, int i) {
                         Toast.makeText(MainActivity.this, "你喜欢红色", Toast.LENGTH_SHORT);
                     }
                 });
                 alertDlg.setNegativeButton("蓝色", new DialogInterface.OnClickListener() {
                     @Override
                     public void onClick(DialogInterface dialogInterface, int i) {
                         Toast.makeText(MainActivity.this, "你喜欢蓝色", Toast.LENGTH_SHORT);
                     }
                 });
                 alertDlg.setNeutralButton("黄色", new DialogInterface.OnClickListener() {
                     @Override
                     public void onClick(DialogInterface dialogInterface, int i) {
                         Toast.makeText(MainActivity.this, "你喜欢黄色", Toast.LENGTH_SHORT);
                     }
                 });
                 alertDlg.show();
             }
         });

         btnContent.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 AlertDialog.Builder alertDlg = new AlertDialog.Builder(MainActivity.this);
                 alertDlg.setTitle("请输入");
                 alertDlg.setIcon(android.R.drawable.ic_dialog_info);
                 alertDlg.setView(new EditText(MainActivity.this)).setPositiveButton("确定", null);
                 alertDlg.setNegativeButton("取消", null);
                 alertDlg.show();
             }
         });

         btnRadio.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 new AlertDialog.Builder(MainActivity.this).setTitle("单选框")
                         .setIcon(android.R.drawable.ic_dialog_info)
                         .setSingleChoiceItems(new String[]{"红色", "蓝色", "黄色"}, 0, null)
                         .setPositiveButton("确定", null)
                         .setNegativeButton("取消", null).show();
             }
         });

         btnCheckBox.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 new AlertDialog.Builder(MainActivity.this).setTitle("复选框")
                         .setIcon(android.R.drawable.ic_dialog_info)
                         .setMultiChoiceItems(new String[]{"红色", "蓝色", "黄色"}, null, null)
                         .setPositiveButton("确定", null)
                         .setNegativeButton("取消", null).show();
             }
         });

         btnList.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 new AlertDialog.Builder(MainActivity.this).setTitle("列表框")
                         .setIcon(android.R.drawable.ic_dialog_info)
                         .setItems(new String[]{"红色", "蓝色", "黄色"}, null)
                         .setPositiveButton("确定", null)
                         .setNegativeButton("取消", null).show();
             }
         });

         btnCostume.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 LayoutInflater inflater = getLayoutInflater();
                 View layout = inflater.inflate(R.layout.activity_main,
                         (ViewGroup)findViewById(R.id.mainMenu));

                 new AlertDialog.Builder(MainActivity.this).setTitle("自定义布局")
                         .setView(layout)
                         .setPositiveButton("确定", null)
                         .setNegativeButton("取消", null).show();
             }
         });

     }

 }

MainActivity.java