安卓开发04：对话框例子

layout中设置两个可点击按钮：

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:orientation="vertical" >

 <Button
     android:id="@+id/btn_dialog"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:text="@string/dialog"
     android:onClick="onClickDialog" />

 <Button
     android:id="@+id/btn_dialogs"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:text="@string/progressDialog"
     android:onClick="onClickProgressDialog" />

 </LinearLayout>

Activity代码：

 package com.example.androidtest;


 import android.app.Activity;
 import android.app.AlertDialog;
 import android.app.AlertDialog.Builder;
 import android.app.Dialog;
 import android.app.ProgressDialog;
 import android.content.DialogInterface;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.Menu;
 import android.view.View;
 import android.view.Window;
 import android.widget.EditText;
 import android.widget.Toast;

 public class MainActivity extends Activity {

     private String tag = "MainActivity";

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         requestWindowFeature(Window.FEATURE_NO_TITLE);
         setContentView(R.layout.activity_main); //设置一个View模板
         Log.d(tag, "In the onCreate() event");
     }

     @Override
     public void onStart() {
         super.onStart();
         Log.d(tag, "In the onStart() event");
         Toast.makeText(getBaseContext(), "onStart", Toast.LENGTH_SHORT).show();
     }

     public void onRestart() {
         super.onRestart();
         Log.d(tag, "In the onRestart() event");
     }

     public void onResume() {
         super.onResume();
         Log.d(tag, "In the onResume() event");
     }

     public void onPause() {
         super.onPause();
         Log.d(tag, "In the onPause() event");
     }

     public void onStop() {
         super.onStop();
         Log.d(tag, "In the onStop() event");
     }

     public void onDestroy() {
         super.onDestroy();
         Log.d(tag, "In the onDestroy() event");
     }

     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         getMenuInflater().inflate(R.menu.main, menu);
         return true;
     }

     /**
      * 点击打开对话框
      * @param v
      */
     @SuppressWarnings("deprecation")
     public void onClickDialog(View v) {
         Log.d(tag, "onClickDialog");
         showDialog(0);
     }

     /**
      * 点击打开进度条
      * @param v
      */
     public void onClickProgressDialog(View v) {
         Log.d(tag, "onClickProgressDialog");
         final ProgressDialog progressDialog = new ProgressDialog(this);
         progressDialog.setTitle("ProgressDialog"); //设置标题
         progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); //设置样式
         progressDialog.setMessage("please wait...");
         progressDialog.setProgress(0); //设置进度开始点
         progressDialog.setMax(100); //进度最大是100
         progressDialog.show();
         new Thread(new Runnable() {

             public void run() {
                 try {
                     Thread.sleep(1000);
                     progressDialog.setProgress(10); //每隔1秒就可以设置10
                     Thread.sleep(1000);
                     progressDialog.setProgress(20);
                     Thread.sleep(1000);
                     progressDialog.setProgress(30);
                     Thread.sleep(1000);
                     progressDialog.setProgress(40);
                     Thread.sleep(1000);
                     progressDialog.setProgress(50);
                     Thread.sleep(1000);
                     progressDialog.setProgress(60);
                     Thread.sleep(1000);
                     progressDialog.setProgress(70);
                     Thread.sleep(1000);
                     progressDialog.setProgress(90);
                     Thread.sleep(1000);
                     progressDialog.setProgress(100);
                     Thread.sleep(1000);
                     progressDialog.dismiss();
                 } catch (InterruptedException e) {
                     e.printStackTrace();
                 }
             }
         }).start();
     }

     @Override
     protected Dialog onCreateDialog(int id) {
         switch (id) {
             case 0:
                 Builder builder = new AlertDialog.Builder(this); //创建一个对话框
                 builder.setTitle("Android 对话框"); //设置标题
                 builder.setMessage("message"); //设置message
                 builder.setIcon(android.R.drawable.ic_dialog_info); //设置图标
                 builder.setView(new EditText(this)); //设置一个填写的框
                 builder.setMultiChoiceItems(new String[] {"选项1","选项2","选项3","选项4"}, null, null); //选择框
                 builder.setPositiveButton("确认", new DialogInterface.OnClickListener() {

                     public void onClick(DialogInterface dialog, int whichButton) {
                         Toast.makeText(getBaseContext(), "YES!", Toast.LENGTH_SHORT).show();
                     }
                 });
                 builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {

                     public void onClick(DialogInterface dialog, int whichButton) {
                         Toast.makeText(getBaseContext(), "NO!", Toast.LENGTH_SHORT).show();
                     }
                 });
                 return builder.create();
         }
         return null;
     }

 }

普通对话框：

我们可以看到layout布局视图中有两个按钮，第一个按钮点击后打开的是普通对话框，点击事件android:onClick后调用Activity中的onClickDialog方法

 <Button
     android:id="@+id/btn_dialog"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:text="@string/dialog"
     android:onClick="onClickDialog" />

Activity中，Dialog代码：

 /**
  * 点击打开对话框
  * @param v
  */
 @SuppressWarnings("deprecation")
 public void onClickDialog(View v) {
     Log.d(tag, "onClickDialog");
     showDialog(0);
 }

 /**
  * 需要重写创建Dialog方法
  */
 @Override
 protected Dialog onCreateDialog(int id) {
     switch (id) {
         case 0:
             Builder builder = new AlertDialog.Builder(this); //创建一个对话框
             builder.setTitle("Android 对话框"); //设置标题
             builder.setMessage("message"); //设置message
             builder.setIcon(android.R.drawable.ic_dialog_info); //设置图标
             builder.setView(new EditText(this)); //设置一个填写的框
             builder.setMultiChoiceItems(new String[] {"选项1","选项2","选项3","选项4"}, null, null); //选择框
             builder.setPositiveButton("确认", new DialogInterface.OnClickListener() {

                 public void onClick(DialogInterface dialog, int whichButton) {
                     Toast.makeText(getBaseContext(), "YES!", Toast.LENGTH_SHORT).show();
                 }
             });
             builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {

                 public void onClick(DialogInterface dialog, int whichButton) {
                     Toast.makeText(getBaseContext(), "NO!", Toast.LENGTH_SHORT).show();
                 }
             });
             return builder.create();
     }
     return null;
 }

进度对话框：

layout中第二个按钮就是调用进度对话框，进度对话框可以显示程序运行进度。

 <Button
     android:id="@+id/btn_dialogs"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:text="@string/progressDialog"
     android:onClick="onClickProgressDialog" />

Activity中，我们需要创建一个进度Dialog:

 /**
    * 点击打开进度条
    * @param v
    */
   public void onClickProgressDialog(View v) {
       Log.d(tag, "onClickProgressDialog");
       final ProgressDialog progressDialog = new ProgressDialog(this);
       progressDialog.setTitle("ProgressDialog"); //设置标题
       progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); //设置样式
       progressDialog.setMessage("please wait...");
       progressDialog.setProgress(0); //设置进度开始点
       progressDialog.setMax(100); //进度最大是100
       progressDialog.show();
       new Thread(new Runnable() {

           public void run() {
               try {
                   //每1秒后，进度条显示10%
                   Thread.sleep(1000);
                   progressDialog.setProgress(10); //每隔1秒就可以设置10
                   Thread.sleep(1000);
                   progressDialog.setProgress(20);
                   Thread.sleep(1000);
                   progressDialog.setProgress(30);
                   Thread.sleep(1000);
                   progressDialog.setProgress(40);
                   Thread.sleep(1000);
                   progressDialog.setProgress(50);
                   Thread.sleep(1000);
                   progressDialog.setProgress(60);
                   Thread.sleep(1000);
                   progressDialog.setProgress(70);
                   Thread.sleep(1000);
                   progressDialog.setProgress(90);
                   Thread.sleep(1000);
                   progressDialog.setProgress(100);
                   Thread.sleep(1000);
                   progressDialog.dismiss();
               } catch (InterruptedException e) {
                   e.printStackTrace();
               }
           }
       }).start();
   }

消息模式弹出框：

 Toast.makeText(getBaseContext(), "YES!", Toast.LENGTH_SHORT).show();

也可以自定义：

 Toast toast=Toast.makeText(getApplicationContext(), "显示带图片的toast", 3000);
               toast.setGravity(Gravity.CENTER, 0, 0);
               //创建图片视图对象
               ImageView imageView= new ImageView(getApplicationContext());
               //设置图片
               imageView.setImageResource(R.drawable.ic_launcher);
               //获得toast的布局
               LinearLayout toastView = (LinearLayout) toast.getView();
               //设置此布局为横向的
               toastView.setOrientation(LinearLayout.HORIZONTAL);
               //将ImageView在加入到此布局中的第一个位置
               toastView.addView(imageView, 0);
               toast.show();