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activity启动模式之singleTop

2017/8/1 22:38:55 饭饭_fan 程序员俱乐部我要评论(0)

摘要：activity启动模式之singleTop一、简介二、设置方法在AndroidManifest.xml中将要设置为singleTop启动模式的页面进行配置<activityandroid:name="activityLaunchSingleTop.ActivityB2"android:launchMode="singleTop"></activity>三、代码实例效果图：代码：activityLaunchSingleTop
标签：模式启动 Activity

activity启动模式之singleTop

一、简介

二、设置方法

在AndroidManifest.xml中将要设置为singleTop启动模式的页面进行配置

三、代码实例

效果图：

代码：

activityLaunchSingleTop.MainActivity

 1 package activityLaunchSingleTop;
 2 
 3 
 4 
 5 
 6 import com.example.activityLaunchSingleTop.R;
 7 
 8 import android.app.Activity;
 9 import android.content.Intent;
10 import android.os.Bundle;
11 import android.view.View;
12 import android.view.View.OnClickListener;
13 import android.widget.Button;
14 
15 
16 
17 public class MainActivity extends Activity{
18     private Button btn_goB1;//创建一个button对象
19     private Button btn_goB2;//创建一个button对象
20      protected void onCreate(Bundle savedInstanceState) {
21             super.onCreate(savedInstanceState);//父类操作
22             setContentView(R.layout.activity_main);//引入名为activity_main的界面
23             btn_goB1=(Button) findViewById(R.id.btn_goB1);//找id为btn_openActivity的button
24             btn_goB1.setOnClickListener(new OnClickListener() {//设置button点击监听
25                 
26                 @Override
27                 public void onClick(View v) {//onclick事件
28                     // TODO Auto-generated method stub
29                     Intent intent=new Intent();//初始化intent
30                     intent.setClass(MainActivity.this,MainActivity.class);//连接
31                     startActivity(intent);//打开activity
32                 }
33             });
34             
35             btn_goB2=(Button) findViewById(R.id.btn_goB2);//找id为btn_openActivity的button
36             btn_goB2.setOnClickListener(new OnClickListener() {//设置button点击监听
37                 
38                 @Override
39                 public void onClick(View v) {//onclick事件
40                     // TODO Auto-generated method stub
41                     Intent intent=new Intent();//初始化intent
42                     intent.setClass(MainActivity.this,ActivityB2.class);//连接
43                     startActivity(intent);//打开activity
44                 }
45             });
46         }
47 }

activityLaunchSingleTop.ActivityB2

 1 package activityLaunchSingleTop;
 2 
 3 
 4 
 5 
 6 import com.example.activityLaunchSingleTop.R;
 7 
 8 import android.app.Activity;
 9 import android.content.Intent;
10 import android.os.Bundle;
11 import android.text.InputFilter.LengthFilter;
12 import android.view.View;
13 import android.view.View.OnClickListener;
14 import android.widget.Button;
15 import android.widget.Toast;
16 
17 
18 
19 public class ActivityB2 extends Activity{
20     private Button btn_goB1;//创建一个button对象
21     private Button btn_goB2;//创建一个button对象
22      protected void onCreate(Bundle savedInstanceState) {
23             super.onCreate(savedInstanceState);//父类操作
24             setContentView(R.layout.activity_b2);//引入名为activity_main的界面
25             btn_goB1=(Button) findViewById(R.id.btn_goB1);//找id为btn_openActivity的button
26             btn_goB1.setOnClickListener(new OnClickListener() {//设置button点击监听
27                 
28                 @Override
29                 public void onClick(View v) {//onclick事件
30                     // TODO Auto-generated method stub
31                     Intent intent=new Intent();//初始化intent
32                     intent.setClass(ActivityB2.this,MainActivity.class);//连接
33                     startActivity(intent);//打开activity
34                 }
35             });
36             
37             btn_goB2=(Button) findViewById(R.id.btn_goB2);//找id为btn_openActivity的button
38             btn_goB2.setOnClickListener(new OnClickListener() {//设置button点击监听
39                 
40                 @Override
41                 public void onClick(View v) {//onclick事件
42                     // TODO Auto-generated method stub
43                     Intent intent=new Intent();//初始化intent
44                     intent.setClass(ActivityB2.this,ActivityB2.class);//连接
45                     startActivity(intent);//打开activity
46                 }
47             });
48         }
49      @Override
50     protected void onNewIntent(Intent intent) {
51         // TODO Auto-generated method stub
52         super.onNewIntent(intent);
53         Toast.makeText(this, "onNewIntent", Toast.LENGTH_SHORT).show();;
54     }
55 }

/activityLaunchSingleTop/AndroidManifest.xml

 1 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 2     package="com.example.activityLaunchSingleTop"
 3     android:versionCode="1"
 4     android:versionName="1.0" >
 5 
 6     <uses-sdk
 7         android:minSdkVersion="8"
 8         android:targetSdkVersion="19" />
 9 
10     <application
11         android:allowBackup="true"
12         android:icon="@drawable/ic_launcher"
13         android:label="@string/app_name"
14         android:theme="@style/AppTheme" >
15         <activity
16             android:name="activityLaunchSingleTop.MainActivity"
17             android:label="@string/app_name" >
18             <intent-filter>
19                 <action android:name="android.intent.action.MAIN" />
20 
21                 <category android:name="android.intent.category.LAUNCHER" />
22             </intent-filter>
23         </activity>
24         
25         <activity android:name="activityLaunchSingleTop.ActivityB2" android:launchMode="singleTop"></activity>
26     </application>
27 
28 </manifest>

/activityLaunchSingleTop/res/layout/activity_main.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6 
 7     <TextView
 8         android:id="@+id/tV_B1"
 9         android:layout_width="match_parent"
10         android:layout_height="96dp"
11         android:text="@string/tV_B1"
12         android:textAppearance="?android:attr/textAppearanceLarge" />
13 
14     <Button
15         android:id="@+id/btn_goB1"
16         android:layout_width="match_parent"
17         android:layout_height="50dp"
18         android:layout_weight="0.00"
19         android:text="@string/btn_goB1" />
20 
21     <Button
22         android:id="@+id/btn_goB2"
23         android:layout_width="match_parent"
24         android:layout_height="wrap_content"
25         android:text="@string/btn_goB2" />
26 
27 </LinearLayout>

/activityLaunchSingleTop/res/layout/activity_b2.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6 
 7     <TextView
 8         android:id="@+id/tV_B2"
 9         android:layout_width="match_parent"
10         android:layout_height="96dp"
11         android:text="@string/tV_B2"
12         android:textAppearance="?android:attr/textAppearanceLarge" />
13 
14     <Button
15         android:id="@+id/btn_goB1"
16         android:layout_width="match_parent"
17         android:layout_height="50dp"
18         android:layout_weight="0.00"
19         android:text="@string/btn_goB1" />
20 
21     <Button
22         android:id="@+id/btn_goB2"
23         android:layout_width="match_parent"
24         android:layout_height="wrap_content"
25         android:text="@string/btn_goB2" />
26 
27 </LinearLayout>