activity启动模式之singleTask
activity启动模式之singleTask
一、简介
如果另外一个应用调用了C2,C2在栈底,如果这个程序里面再嗲用C1,C3,C2,那么这个C2就是调用onNewIntant的,C1和C3都被销毁了;
另一个程序>c2>c1>c3>c2,实际只剩:另一个程序>c2。
二、代码实例
效果图:
上面就是调用了onNewIntent方法的情况
代码:
activity.C1
1 package activity; 2 3 4 5 6 import com.example.activityLaunchSingleTask.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 C1 extends Activity implements OnClickListener{ 18 private Button btn_c1;//创建一个button对象 19 private Button btn_c2;//创建一个button对象 20 private Button btn_c3;//创建一个button对象 21 protected void onCreate(Bundle savedInstanceState) { 22 super.onCreate(savedInstanceState);//父类操作 23 setContentView(R.layout.activity_main);//引入名为activity_main的界面 24 setTitle("我是C1"); 25 btn_c1=(Button) findViewById(R.id.btn_c1);//找id为btn_openActivity的button 26 btn_c2=(Button) findViewById(R.id.btn_c2);//找id为btn_openActivity的button 27 btn_c3=(Button) findViewById(R.id.btn_c3);//找id为btn_openActivity的button 28 btn_c1.setOnClickListener(this); 29 btn_c2.setOnClickListener(this); 30 btn_c3.setOnClickListener(this); 31 } 32 @Override 33 public void onClick(View v) { 34 // TODO Auto-generated method stub 35 switch (v.getId()) { 36 case R.id.btn_c1: 37 Intent intent=new Intent(); 38 intent.setClass(C1.this, C1.class); 39 startActivity(intent); 40 break; 41 case R.id.btn_c2: 42 Intent intent2=new Intent(); 43 intent2.setClass(C1.this, C2.class); 44 startActivity(intent2); 45 break; 46 case R.id.btn_c3: 47 Intent intent3=new Intent(); 48 intent3.setClass(C1.this, C3.class); 49 startActivity(intent3); 50 break; 51 default: 52 break; 53 } 54 } 55 }
activity.C2
1 package activity; 2 3 4 5 6 import com.example.activityLaunchSingleTask.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 import android.widget.Toast; 15 16 17 18 public class C2 extends Activity implements OnClickListener{ 19 private Button btn_c1;//创建一个button对象 20 private Button btn_c2;//创建一个button对象 21 private Button btn_c3;//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_main);//引入名为activity_main的界面 25 setTitle("我是C2"); 26 btn_c1=(Button) findViewById(R.id.btn_c1);//找id为btn_openActivity的button 27 btn_c2=(Button) findViewById(R.id.btn_c2);//找id为btn_openActivity的button 28 btn_c3=(Button) findViewById(R.id.btn_c3);//找id为btn_openActivity的button 29 btn_c1.setOnClickListener(this); 30 btn_c2.setOnClickListener(this); 31 btn_c3.setOnClickListener(this); 32 } 33 @Override 34 public void onClick(View v) { 35 // TODO Auto-generated method stub 36 switch (v.getId()) { 37 case R.id.btn_c1: 38 Intent intent=new Intent(); 39 intent.setClass(C2.this, C1.class); 40 startActivity(intent); 41 break; 42 case R.id.btn_c2: 43 Intent intent2=new Intent(); 44 intent2.setClass(C2.this, C2.class); 45 startActivity(intent2); 46 break; 47 case R.id.btn_c3: 48 Intent intent3=new Intent(); 49 intent3.setClass(C2.this, C3.class); 50 startActivity(intent3); 51 break; 52 default: 53 break; 54 } 55 } 56 57 @Override 58 protected void onNewIntent(Intent intent) { 59 // TODO Auto-generated method stub 60 super.onNewIntent(intent); 61 Toast.makeText(this, "onNewIntent", Toast.LENGTH_SHORT).show(); 62 } 63 }
activity.C3
1 package activity; 2 3 4 5 6 import com.example.activityLaunchSingleTask.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 C3 extends Activity implements OnClickListener{ 18 private Button btn_c1;//创建一个button对象 19 private Button btn_c2;//创建一个button对象 20 private Button btn_c3;//创建一个button对象 21 protected void onCreate(Bundle savedInstanceState) { 22 super.onCreate(savedInstanceState);//父类操作 23 setContentView(R.layout.activity_main);//引入名为activity_main的界面 24 setTitle("我是C3"); 25 btn_c1=(Button) findViewById(R.id.btn_c1);//找id为btn_openActivity的button 26 btn_c2=(Button) findViewById(R.id.btn_c2);//找id为btn_openActivity的button 27 btn_c3=(Button) findViewById(R.id.btn_c3);//找id为btn_openActivity的button 28 btn_c1.setOnClickListener(this); 29 btn_c2.setOnClickListener(this); 30 btn_c3.setOnClickListener(this); 31 } 32 @Override 33 public void onClick(View v) { 34 // TODO Auto-generated method stub 35 switch (v.getId()) { 36 case R.id.btn_c1: 37 Intent intent=new Intent(); 38 intent.setClass(C3.this, C1.class); 39 startActivity(intent); 40 break; 41 case R.id.btn_c2: 42 Intent intent2=new Intent(); 43 intent2.setClass(C3.this, C2.class); 44 startActivity(intent2); 45 break; 46 case R.id.btn_c3: 47 Intent intent3=new Intent(); 48 intent3.setClass(C3.this, C3.class); 49 startActivity(intent3); 50 break; 51 default: 52 break; 53 } 54 } 55 }
/activityLaunchSingleTask/AndroidManifest.xml
1 <manifest xmlns:android="http://schemas.android.com/apk/res/android" 2 package="com.example.activityLaunchSingleTask" 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="activity.C1" 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 <activity android:name="activity.C2" android:launchMode="singleTask"> 25 <intent-filter> 26 <action android:name="com.example.activityLaunchSingleTask" /> 27 <category android:name="android.intent.category.DEFAULT" /> 28 </intent-filter> 29 </activity> 30 <activity android:name="activity.C3"></activity> 31 </application> 32 33 </manifest>
/activityLaunchSingleTask/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 <Button 8 android:id="@+id/btn_c1" 9 android:layout_width="match_parent" 10 android:layout_height="50dp" 11 android:layout_weight="0.00" 12 android:text="@string/btn_c1" /> 13 14 <Button 15 android:id="@+id/btn_c2" 16 android:layout_width="match_parent" 17 android:layout_height="wrap_content" 18 android:text="@string/btn_c2" /> 19 20 <Button 21 android:id="@+id/btn_c3" 22 android:layout_width="match_parent" 23 android:layout_height="wrap_content" 24 android:text="@string/btn_c3" /> 25 26 </LinearLayout>