系出名门Android(3) - 对话框(Dialog)和通知(Notification)

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系出名门Android(3) - 对话框(Dialog)和通知(Notification)


作者:webabcd


介绍
在 Android 中种对话框及各种通知效果的应用
常用对话框的使用,弹出式对话框、日期选择对话框、时间选择对话框、进度条对话框 
通知(出现在通知列表)和提示性通知(Toast)的演示


1、常用对话框的演示
res/layout/main.xml

代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
   
    <TextView android:id="@+id/txtMsg" android:layout_width="wrap_content"
        android:layout_height="wrap_content"></TextView>
       
    <Button android:id="@+id/btn1" android:layout_width="wrap_content"
        android:layout_height="wrap_content"></Button>
    <Button android:id="@+id/btn2" android:layout_width="wrap_content"
        android:layout_height="wrap_content"></Button>
    <Button android:id="@+id/btn3" android:layout_width="wrap_content"
        android:layout_height="wrap_content"></Button>
    <Button android:id="@+id/btn4" android:layout_width="wrap_content"
        android:layout_height="wrap_content"></Button>
    <Button android:id="@+id/btn5" android:layout_width="wrap_content"
        android:layout_height="wrap_content"></Button>
    <Button android:id="@+id/btn6" android:layout_width="wrap_content"
        android:layout_height="wrap_content"></Button>
       
</LinearLayout>


res/layout/view.xml

代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
   
    <TextView android:text="我是一个 View"
        android:layout_width="wrap_content" android:layout_height="wrap_content">
    </TextView>
   
</LinearLayout>


res/values/array.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <!--
        定义一个名为 ary 的 string 类型的数组
    -->
    <string-array name="ary">
        <item>项目 1</item>
        <item>项目 2</item>
    </string-array>
</resources>


Main.java

代码
package com.webabcd.dialog;

import java.util.Calendar;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.app.TimePickerDialog;
import android.app.DatePickerDialog.OnDateSetListener;
import android.app.TimePickerDialog.OnTimeSetListener;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.View;
import android.widget.DatePicker;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.Button;

public class Main extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // 弹出式对话框的 Demo。先调用 Builder(),在 Create(), 需要显示对话框的是后再调用 show()
        AlertDialog dialog = new AlertDialog.Builder(this).setTitle("弹出对话框").create();
        dialog.show();
       
        // 以下是各种对话框的 Demo
        MyButtonClickListener listener = new MyButtonClickListener();
        Button btn1 = (Button) this.findViewById(R.id.btn1);
        btn1.setText("简单的对话框的 Demo");
        btn1.setOnClickListener(listener);

        Button btn2 = (Button) this.findViewById(R.id.btn2);
        btn2.setText("包括常用设置的对话框(数据来自 xml)");
        btn2.setOnClickListener(listener);

        Button btn3 = (Button) this.findViewById(R.id.btn3);
        btn3.setText("弹出的对话框的内容是一个 View");
        btn3.setOnClickListener(listener);

        Button btn4 = (Button) this.findViewById(R.id.btn4);
        btn4.setText("日期选择对话框");
        btn4.setOnClickListener(listener);

        Button btn5 = (Button) this.findViewById(R.id.btn5);
        btn5.setText("时间选择对话框");
        btn5.setOnClickListener(listener);

        Button btn6 = (Button) this.findViewById(R.id.btn6);
        btn6.setText("进度条对话框");
        btn6.setOnClickListener(listener);
    }

    class MyButtonClickListener implements View.OnClickListener {
        @Override
        public void onClick(View v) {
           
            // 具体的对话框的实现可以通过重写 onCreateDialog 完成
           
            switch (v.getId()) {
            case R.id.btn1:
                Main.this.showDialog(0);
                break;
            case R.id.btn2:
                Main.this.showDialog(1);
                break;
            case R.id.btn3:
                Main.this.showDialog(2);
                break;
            case R.id.btn4:
                Main.this.showDialog(3);
                break;
            case R.id.btn5:
                Main.this.showDialog(4);
                break;
            case R.id.btn6:
                Main.this.showDialog(5);
                break;
            }
        }
    }

    @Override
    public Dialog onCreateDialog(int id) {
        switch (id) {

        case 0:
            // 一个简单的弹出对话框
            return new AlertDialog.Builder(this).setTitle("这是一个简单的弹出对话框的 Demo")
                    .create();

        case 1:
            // 一个相对复杂的弹出对话框
            return new AlertDialog.Builder(this)
                    .setTitle("标题") // 设置标题
                    // .setCustomTitle(View) // 以一个 View 作为标题
                    .setIcon(R.drawable.icon01) // 设置标题图片
                    // .setMessage("信息") // 需要显示的弹出内容
                    .setPositiveButton("确定", new OnClickListener() { // 设置弹框的确认按钮所显示的文本,以及单击按钮后的响应行为
                        @Override
                        public void onClick(DialogInterface a0, int a1) {
                            TextView txtMsg = (TextView) Main.this.findViewById(R.id.txtMsg);
                            txtMsg.append("单击了对话框上的“确认”按钮\n");
                        }
                    })
                    .setItems(R.array.ary, new DialogInterface.OnClickListener() { // 弹框所显示的内容来自一个数组。数组中的数据会一行一行地依次排列
                        public void onClick(DialogInterface dialog,    int which) {
                        }
                    })
                    // 其他常用方法如下
                    // .setMultiChoiceItems(arg0, arg1, arg2)
                    // .setSingleChoiceItems(arg0, arg1, arg2)
                    // .setNeutralButton(arg0, arg1)
                    // .setNegativeButton(arg0, arg1)
                    .create();

        case 2:
            // 弹出对话框为指定的 View 的 Demo
            return new AlertDialog.Builder(this).setTitle("此对话框的内容是一个 View")
                    .setView(this.findViewById(R.layout.view)).create();

        case 3:
            // 弹出日期选择对话框
            Calendar c = Calendar.getInstance();
            return new DatePickerDialog(this, new OnDateSetListener() {
                @Override
                public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                    TextView txtMsg = (TextView) Main.this.findViewById(R.id.txtMsg);
                    txtMsg.append("新设置的日期为:" + String.valueOf(year) + "-"
                            + String.valueOf(monthOfYear) + "-"
                            + String.valueOf(dayOfMonth) + "\n");
                }
            }, c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DATE));

        case 4:
            // 弹出时间选择对话框
            Calendar c2 = Calendar.getInstance();
            return new TimePickerDialog(this, new OnTimeSetListener() {
                @Override
                public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                    TextView txtMsg = (TextView) Main.this.findViewById(R.id.txtMsg);
                    txtMsg.append("新设置的时间为:"
                            + String.valueOf(hourOfDay) + ":"
                            + String.valueOf(minute) + "\n");
                }

            }, c2.get(Calendar.HOUR), c2.get(Calendar.MINUTE), true);

        case 5:
            // 弹出进度条对话框
            ProgressDialog progress = new ProgressDialog(this);
            progress.setMessage("loading...");
            return progress;

        default:
            return null;
        }
    }
}


2、各种提示效果的演示
res/layout/main.xml

代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
   
    <Button android:id="@+id/btn1" android:layout_width="wrap_content"
        android:layout_height="wrap_content"></Button>
    <Button android:id="@+id/btn2" android:layout_width="wrap_content"
        android:layout_height="wrap_content"></Button>
    <Button android:id="@+id/btn3" android:layout_width="wrap_content"
        android:layout_height="wrap_content"></Button>
    <Button android:id="@+id/btn4" android:layout_width="wrap_content"
        android:layout_height="wrap_content"></Button>
       
</LinearLayout>


res/layout/view.xml

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


Main.java

代码
package com.webabcd.notification;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class Main extends Activity {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // 通过 Tost.makeText().show() 来实现提示性的通知效果
        // 短时间的提示性通知的 Demo
        Button btn1 = (Button) this.findViewById(R.id.btn1);
        btn1.setText("短时间提示");
        btn1.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                Toast.makeText(Main.this, "我是短时间提示", Toast.LENGTH_SHORT).show();
            }
        });

        // 长时间的提示性通知的 Demo
        Button btn2 = (Button) this.findViewById(R.id.btn2);
        btn2.setText("长时间提示");
        btn2.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                Toast.makeText(Main.this, "我是长时间提示", Toast.LENGTH_LONG).show();
            }
        });

        // 以一个 View 作为提示性通知的 Demo
        Button btn3 = (Button) this.findViewById(R.id.btn3);
        btn3.setText("以一个 View 做提示");
        btn3.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                View view = inflateView(R.layout.view);
                TextView txtMsg = (TextView) view.findViewById(R.id.txtMsg);
                txtMsg.setText("提示内容");

                Toast toast = new Toast(Main.this);
                toast.setView(view);
                toast.setDuration(Toast.LENGTH_LONG);
                toast.show();
            }
        });

       
        Button btn4 = (Button) this.findViewById(R.id.btn4);
        btn4.setText("发出一个通知(Notification)");
        btn4.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                // 实例化通知管理器
                NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

                // 指定单击通知后所打开的详细的通知页面(单击通知后打开 NotificationView)
                PendingIntent contentIntent = PendingIntent.getActivity(
                        Main.this, 0, new Intent(Main.this,    NotificationView.class), 0);

                // 实例化一个通知,并指定其图标和标题(在提示栏上显示)
                Notification n = new Notification(R.drawable.icon01, "我是滚动的通知信息我是滚动的通知信息我是滚动的通知信息", System.currentTimeMillis());
               
                // 设置通知的发送人和通知的详细内容(打开提示栏后在通知列表中显示)
                n.setLatestEventInfo(Main.this, "通知发送人", "我是详细的通知信息我是详细的通知信息我是详细的通知信息", contentIntent);

                // 100 毫秒延迟后,震动 250 毫秒,暂停 100 毫秒后,再震动 500 毫秒
                n.vibrate = new long[] { 100, 250, 100, 500 };
               
                // 发出通知(其中第一个参数为通知标识符)
                nm.notify(0, n);
            }
        });
    }

    // 将指定的 xml 资源转换为一个 View
    private View inflateView(int resource) {
        LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        return vi.inflate(resource, null);
    }

    // 打开详细通知页后此 Activity 会被 Pause,从详细通知页返回后此 Activity 会被 Resume
    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
       
        Log.d("MyDebug", "onPause");
    }
   
    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
       
        Log.d("MyDebug", "onResume");
    }
}

NotificationView.java

代码
package com.webabcd.notification;

import android.app.Activity;
import android.app.NotificationManager;
import android.os.Bundle;
import android.widget.TextView;

// 单击通知列表的某个通知后,所打开的详细的通知页
public class NotificationView extends Activity {
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.view);

        TextView txtMsg = (TextView)this.findViewById(R.id.txtMsg);
        txtMsg.setText("点通知之后所链接到的 Activity");
       
        NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        // 取消显示在通知列表中的指定通知(参数为通知标识符)
        nm.cancel(0);
       
        // 需要关闭此 Activity 的话就 finish 它既可
        // this.finish();
    }
}