activity启动模式之singleInstance
一、简介
Log.d("C2", getTaskId()+"");里面的getTaskId()可以获取activity栈的编号
二、代码实例
结果图：
代码：
activity.C1
1 package activity; 2 3 4 5 6 7 import com.example.activityLaunchSingleInstance.R; 8 9 import android.app.Activity; 10 import android.content.Intent; 11 import android.os.Bundle; 12 import android.util.Log; 13 import android.view.View; 14 import android.view.View.OnClickListener; 15 import android.widget.Button; 16 17 18 19 public class C1 extends Activity implements OnClickListener{ 20 private Button btn_c1;//创建一个button对象 21 private Button btn_c2;//创建一个button对象 22 private Button btn_c3;//创建一个button对象 23 protected void onCreate(Bundle savedInstanceState) { 24 super.onCreate(savedInstanceState);//父类操作 25 setContentView(R.layout.activity_main);//引入名为activity_main的界面 26 Log.d("C1", getTaskId()+""); 27 setTitle("我是C1"); 28 btn_c1=(Button) findViewById(R.id.btn_c1);//找id为btn_openActivity的button 29 btn_c2=(Button) findViewById(R.id.btn_c2);//找id为btn_openActivity的button 30 btn_c3=(Button) findViewById(R.id.btn_c3);//找id为btn_openActivity的button 31 btn_c1.setOnClickListener(this); 32 btn_c2.setOnClickListener(this); 33 btn_c3.setOnClickListener(this); 34 } 35 @Override 36 public void onClick(View v) { 37 // TODO Auto-generated method stub 38 switch (v.getId()) { 39 case R.id.btn_c1: 40 Intent intent=new Intent(); 41 intent.setClass(C1.this, C1.class); 42 startActivity(intent); 43 break; 44 case R.id.btn_c2: 45 Intent intent2=new Intent(); 46 intent2.setClass(C1.this, C2.class); 47 startActivity(intent2); 48 break; 49 case R.id.btn_c3: 50 Intent intent3=new Intent(); 51 intent3.setClass(C1.this, C3.class); 52 startActivity(intent3); 53 break; 54 default: 55 break; 56 } 57 } 58 }
activity.C2
1 package activity; 2 3 4 5 6 7 import com.example.activityLaunchSingleInstance.R; 8 9 import android.app.Activity; 10 import android.content.Intent; 11 import android.os.Bundle; 12 import android.util.Log; 13 import android.view.View; 14 import android.view.View.OnClickListener; 15 import android.widget.Button; 16 import android.widget.Toast; 17 18 19 20 public class C2 extends Activity implements OnClickListener{ 21 private Button btn_c1;//创建一个button对象 22 private Button btn_c2;//创建一个button对象 23 private Button btn_c3;//创建一个button对象 24 protected void onCreate(Bundle savedInstanceState) { 25 super.onCreate(savedInstanceState);//父类操作 26 setContentView(R.layout.activity_main);//引入名为activity_main的界面 27 Log.d("C2", getTaskId()+""); 28 setTitle("我是C2"); 29 btn_c1=(Button) findViewById(R.id.btn_c1);//找id为btn_openActivity的button 30 btn_c2=(Button) findViewById(R.id.btn_c2);//找id为btn_openActivity的button 31 btn_c3=(Button) findViewById(R.id.btn_c3);//找id为btn_openActivity的button 32 btn_c1.setOnClickListener(this); 33 btn_c2.setOnClickListener(this); 34 btn_c3.setOnClickListener(this); 35 } 36 @Override 37 public void onClick(View v) { 38 // TODO Auto-generated method stub 39 switch (v.getId()) { 40 case R.id.btn_c1: 41 Intent intent=new Intent(); 42 intent.setClass(C2.this, C1.class); 43 startActivity(intent); 44 break; 45 case R.id.btn_c2: 46 Intent intent2=new Intent(); 47 intent2.setClass(C2.this, C2.class); 48 startActivity(intent2); 49 break; 50 case R.id.btn_c3: 51 Intent intent3=new Intent(); 52 intent3.setClass(C2.this, C3.class); 53 startActivity(intent3); 54 break; 55 default: 56 break; 57 } 58 } 59 60 @Override 61 protected void onNewIntent(Intent intent) { 62 // TODO Auto-generated method stub 63 super.onNewIntent(intent); 64 Toast.makeText(this, "onNewIntent", Toast.LENGTH_SHORT).show(); 65 Log.d("C2", "onNewIntent"); 66 } 67 }
activity.C3
1 package activity; 2 3 4 5 6 7 import com.example.activityLaunchSingleInstance.R; 8 9 import android.app.Activity; 10 import android.content.Intent; 11 import android.os.Bundle; 12 import android.util.Log; 13 import android.view.View; 14 import android.view.View.OnClickListener; 15 import android.widget.Button; 16 17 18 19 public class C3 extends Activity implements OnClickListener{ 20 private Button btn_c1;//创建一个button对象 21 private Button btn_c2;//创建一个button对象 22 private Button btn_c3;//创建一个button对象 23 protected void onCreate(Bundle savedInstanceState) { 24 super.onCreate(savedInstanceState);//父类操作 25 setContentView(R.layout.activity_main);//引入名为activity_main的界面 26 Log.d("C3", getTaskId()+""); 27 setTitle("我是C3"); 28 btn_c1=(Button) findViewById(R.id.btn_c1);//找id为btn_openActivity的button 29 btn_c2=(Button) findViewById(R.id.btn_c2);//找id为btn_openActivity的button 30 btn_c3=(Button) findViewById(R.id.btn_c3);//找id为btn_openActivity的button 31 btn_c1.setOnClickListener(this); 32 btn_c2.setOnClickListener(this); 33 btn_c3.setOnClickListener(this); 34 } 35 @Override 36 public void onClick(View v) { 37 // TODO Auto-generated method stub 38 switch (v.getId()) { 39 case R.id.btn_c1: 40 Intent intent=new Intent(); 41 intent.setClass(C3.this, C1.class); 42 startActivity(intent); 43 break; 44 case R.id.btn_c2: 45 Intent intent2=new Intent(); 46 intent2.setClass(C3.this, C2.class); 47 startActivity(intent2); 48 break; 49 case R.id.btn_c3: 50 Intent intent3=new Intent(); 51 intent3.setClass(C3.this, C3.class); 52 startActivity(intent3); 53 break; 54 default: 55 break; 56 } 57 } 58 }
/activityLaunchSingleInstance/AndroidManifest.xml
1 <manifest xmlns:android="http://schemas.android.com/apk/res/android" 2 package="com.example.activityLaunchSingleInstance" 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="singleInstance"> 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>