笔记17 | 复习AlertDialog(对话框)示例

package com.Evan.demo_alertdialog;  import android.R.menu;  import android.app.Activity;  import android.app.AlertDialog;  import android.content.DialogInterface;  import android.content.DialogInterface.OnClickListener;  import android.content.DialogInterface.OnMultiChoiceClickListener;  import android.os.Bundle;  import android.view.View;  import android.widget.Button;  import android.widget.Toast;  public class MainActivity extends Activity {      private Button dialog_1,dialog_2,dialog_3,dialog_4;      private AlertDialog alert;      private AlertDialog.Builder builder=null;      private boolean[] checkItems;      private final String[] Loves={              "benz","BMW","Lamborghini","Porsche","Audi"      };      @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_main);          SetView();      }      private void SetView() {          dialog_1=(Button) findViewById(R.id.button1);          dialog_2=(Button) findViewById(R.id.button2);          dialog_3=(Button) findViewById(R.id.button3);          dialog_4=(Button) findViewById(R.id.button4);      }      public void onClick(View v){          switch (v.getId()) {          /*           * 普通选择对话框           */          case R.id.button1:              alert=null;              builder=new AlertDialog.Builder(MainActivity.this);              alert=builder.setIcon(R.drawable.aa4)//图标                      .setTitle("标题设置")                      .setMessage("弹出主题设置")                      .setNegativeButton("取消", new OnClickListener() {                          @Override                          public void onClick(DialogInterface dialog, int which) {                              Toast.makeText(MainActivity.this, "您选择了：取消", 0).show();                          }                      }).setPositiveButton("确认", new OnClickListener() {                          @Override                          public void onClick(DialogInterface dialog, int which) {                              Toast.makeText(MainActivity.this, "您选择了：确认", 0).show();                          }                      }).create();//创建              alert.show();//显示              break;              /*               * 普通单选对话框               */          case R.id.button2:              alert=null;              builder=new AlertDialog.Builder(MainActivity.this);              alert=builder.setIcon(R.drawable.aa4)                      .setTitle("标题设置")                      .setItems(Loves, new OnClickListener() {                          @Override                          public void onClick(DialogInterface dialog, int which) {                              Toast.makeText(MainActivity.this, "你选择了："+Loves[which], 0).show();                          }                      }).create();              alert.show();              break;              /*               * 单项选择对话框               */          case R.id.button3:              alert=null;              builder=new AlertDialog.Builder(MainActivity.this);              alert=builder.setIcon(R.drawable.aa4)                      .setTitle("标题设置")                      .setSingleChoiceItems(Loves, 0, new OnClickListener() {                          @Override                          public void onClick(DialogInterface dialog, int which) {                              Toast.makeText(getApplicationContext(), "你选择了" + Loves[which], Toast.LENGTH_SHORT).show();                          }                      }).create();              alert.show();              break;              /*               * 多项选择对话框               */          case R.id.button4:              checkItems = new boolean[]{false, false, false, false, false};              alert=null;              builder=new AlertDialog.Builder(MainActivity.this);              alert=builder.setIcon(R.drawable.aa4)                      .setTitle("标题设置")                      .setMultiChoiceItems(Loves, checkItems, new OnMultiChoiceClickListener() {                          @Override                          public void onClick(DialogInterface dialog, int which, boolean isChecked) {                              checkItems[which]=isChecked;                          }                      }).setPositiveButton("确实选择", new OnClickListener() {                          @Override                          public void onClick(DialogInterface dialog, int which) {                              String result="";                              for(int i=0;i<checkItems.length;i++){                                  if(checkItems[i])                                      result+=Loves[i]+" ";                              }                              Toast.makeText(getApplicationContext(), "选择的是:" + result, Toast.LENGTH_SHORT).show();                          }                      })                      .create();              alert.show();              break;          }      }  }  

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"      xmlns:tools="http://schemas.android.com/tools"      android:layout_width="match_parent"      android:layout_height="match_parent"      tools:context=".MainActivity" >      <Button          android:id="@+id/button1"          android:layout_width="match_parent"          android:layout_height="wrap_content"          android:layout_alignParentLeft="true"          android:layout_alignParentTop="true"          android:layout_marginTop="14dp"          android:onClick="onClick"          android:text="普通选择对话框" />      <Button          android:id="@+id/button2"          android:layout_width="match_parent"          android:layout_height="wrap_content"          android:layout_alignParentLeft="true"          android:layout_below="@+id/button1"          android:onClick="onClick"          android:text="普通单选对话框" />      <Button          android:id="@+id/button3"          android:layout_width="match_parent"          android:layout_height="wrap_content"          android:layout_alignLeft="@+id/button1"          android:layout_below="@+id/button2"          android:onClick="onClick"          android:text="单项选择对话框" />      <Button          android:id="@+id/button4"          android:layout_width="match_parent"          android:onClick="onClick"          android:layout_height="wrap_content"          android:layout_alignLeft="@+id/button2"          android:layout_below="@+id/button3"          android:text="多项选择对话框" />  </RelativeLayout>