09_消息通知Toast和Notification

1. Toast

　　学习创建长短不一的Toast提示，并自定义Toast在屏幕上的位置以及Toast的外观。

 1 package com.example.toastdemo;
 2
 3 import android.app.Activity;
 4 import android.app.ActionBar;
 5 import android.app.Fragment;
 6 import android.os.Bundle;
 7 import android.view.Gravity;
 8 import android.view.LayoutInflater;
 9 import android.view.Menu;
10 import android.view.MenuItem;
11 import android.view.View;
12 import android.view.ViewGroup;
13 import android.widget.Button;
14 import android.widget.ImageView;
15 import android.widget.Toast;
16 import android.os.Build;
17
18 public class MainActivity extends Activity {
19
20     private Button btnShowToastShort, btnShowToastLong, btnShowToastImage;
21
22     @Override
23     protected void onCreate(Bundle savedInstanceState) {
24         super.onCreate(savedInstanceState);
25         setContentView(R.layout.activity_main);
26
27         btnShowToastShort = (Button) findViewById(R.id.btnShowToast);
28         btnShowToastLong = (Button) findViewById(R.id.btnShowToastLong);
29         btnShowToastImage = (Button) findViewById(R.id.btnShowToastImage);
30
31         btnShowToastShort.setOnClickListener(new View.OnClickListener() {
32
33             @Override
34             public void onClick(View v) {
35                 // 可以改变Toast显示的位置；
36
37                 Toast shortToast = Toast.makeText(MainActivity.this,
38                         "显示一个简短的Toast", Toast.LENGTH_SHORT);
39                 shortToast.setGravity(Gravity.CENTER, 0, 0);
40                 shortToast.show();
41             }
42         });
43
44         btnShowToastLong.setOnClickListener(new View.OnClickListener() {
45
46             @Override
47             public void onClick(View v) {
48                 Toast.makeText(MainActivity.this, "显示一个较长的Toast",
49                         Toast.LENGTH_LONG).show();
50             }
51         });
52
53         btnShowToastImage.setOnClickListener(new View.OnClickListener() {
54
55             // 显示图片之后，就不会显示文字。
56             // 若想显示其它，需要定义Layout
57             @Override
58             public void onClick(View v) {
59                 Toast imageToast = Toast.makeText(MainActivity.this,
60                         "显示一个图片的Toast", Toast.LENGTH_LONG);
61                 ImageView imageView = new ImageView(MainActivity.this);
62                 imageView.setImageResource(R.drawable.ic_launcher);
63                 imageToast.setView(imageView);
64                 imageToast.show();
65             }
66         });
67
68     }
69
70 }

MainActivity

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:id="@+id/container"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:orientation="vertical"
 7     tools:context="com.example.toastdemo.MainActivity"
 8     tools:ignore="MergeRootFrame" >
 9
10     <Button
11         android:id="@+id/btnShowToast"
12         android:layout_width="fill_parent"
13         android:layout_height="wrap_content"
14         android:text="显示一个简短的Toast" />
15
16     <Button
17         android:id="@+id/btnShowToastLong"
18         android:layout_width="fill_parent"
19         android:layout_height="wrap_content"
20         android:text="显示一个较长的Toast" />
21
22     <Button
23         android:id="@+id/btnShowToastImage"
24         android:layout_width="fill_parent"
25         android:layout_height="wrap_content"
26         android:text="显示一个图片的Toast" />
27
28 </LinearLayout>

activity_main.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="com.example.toastdemo"
 4     android:versionCode="1"
 5     android:versionName="1.0" >
 6
 7     <uses-sdk
 8         android:minSdkVersion="14"
 9         android:targetSdkVersion="19" />
10
11     <application
12         android:allowBackup="true"
13         android:icon="@drawable/ic_launcher"
14         android:label="@string/app_name"
15         android:theme="@style/AppTheme" >
16         <activity
17             android:name="com.example.toastdemo.MainActivity"
18             android:label="@string/app_name" >
19             <intent-filter>
20                 <action android:name="android.intent.action.MAIN" />
21
22                 <category android:name="android.intent.category.LAUNCHER" />
23             </intent-filter>
24         </activity>
25     </application>
26
27 </manifest>

AndroidManifest.xml

2. Notification

　　学习创建Notification对象，为其指定标题、内容和图标，以及Notification的更新方法。

 1 package com.example.notificationdemo;
 2
 3 import android.app.Activity;
 4 import android.app.Notification;
 5 import android.app.NotificationManager;
 6 import android.content.Context;
 7 import android.os.Bundle;
 8 import android.support.v4.app.NotificationCompat;
 9 import android.support.v4.app.NotificationCompat.Builder;
10 import android.view.View;
11 import android.widget.Button;
12
13 public class MainActivity extends Activity {
14
15     public static final int NOTIFICATION_ID = 1234;
16     private Button btn1;
17     private int conter = 0;
18
19     @Override
20     protected void onCreate(Bundle savedInstanceState) {
21         super.onCreate(savedInstanceState);
22         setContentView(R.layout.activity_main);
23
24         btn1 = (Button) findViewById(R.id.but1);
25         btn1.setOnClickListener(new View.OnClickListener() {
26
27             @Override
28             public void onClick(View v) {
29                 conter++;
30                 Builder builder = new NotificationCompat.Builder(
31                         MainActivity.this);
32                 builder.setSmallIcon(R.drawable.ic_launcher);
33                 builder.setContentTitle("你已经创建" + conter + "个新消息了！");
34                 builder.setContentText("Notification~~~");
35
36                 Notification notification = builder.build();
37                 NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
38                 manager.notify(NOTIFICATION_ID, notification);
39
40             }
41         });
42
43     }
44
45 }

MainActivity

 1 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:id="@+id/container"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     tools:context="com.example.notificationdemo.MainActivity"
 7     tools:ignore="MergeRootFrame" >
 8
 9     <Button
10         android:id="@+id/but1"
11         android:layout_width="fill_parent"
12         android:layout_height="wrap_content"
13         android:text="创建一个提示" />
14
15 </FrameLayout>

activity_main.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="com.example.notificationdemo"
 4     android:versionCode="1"
 5     android:versionName="1.0" >
 6
 7     <uses-sdk
 8         android:minSdkVersion="14"
 9         android:targetSdkVersion="19" />
10
11     <application
12         android:allowBackup="true"
13         android:icon="@drawable/ic_launcher"
14         android:label="@string/app_name"
15         android:theme="@style/AppTheme" >
16         <activity
17             android:name="com.example.notificationdemo.MainActivity"
18             android:label="@string/app_name" >
19             <intent-filter>
20                 <action android:name="android.intent.action.MAIN" />
21
22                 <category android:name="android.intent.category.LAUNCHER" />
23             </intent-filter>
24         </activity>
25     </application>
26
27 </manifest>

AndroidManifest.xml