activity启动模式之singleInstance

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

 package activity;

 import com.example.activityLaunchSingleInstance.R;

 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;

 public class C1 extends Activity implements OnClickListener{
     private Button btn_c1;//创建一个button对象
     private Button btn_c2;//创建一个button对象
     private Button btn_c3;//创建一个button对象
      protected void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);//父类操作
             setContentView(R.layout.activity_main);//引入名为activity_main的界面
             Log.d("C1", getTaskId()+"");
             setTitle("我是C1");
             btn_c1=(Button) findViewById(R.id.btn_c1);//找id为btn_openActivity的button
             btn_c2=(Button) findViewById(R.id.btn_c2);//找id为btn_openActivity的button
             btn_c3=(Button) findViewById(R.id.btn_c3);//找id为btn_openActivity的button
             btn_c1.setOnClickListener(this);
             btn_c2.setOnClickListener(this);
             btn_c3.setOnClickListener(this);
         }
     @Override
     public void onClick(View v) {
         // TODO Auto-generated method stub
         switch (v.getId()) {
         case R.id.btn_c1:
             Intent intent=new Intent();
             intent.setClass(C1.this, C1.class);
             startActivity(intent);
             break;
         case R.id.btn_c2:
             Intent intent2=new Intent();
             intent2.setClass(C1.this, C2.class);
             startActivity(intent2);
             break;
         case R.id.btn_c3:
             Intent intent3=new Intent();
             intent3.setClass(C1.this, C3.class);
             startActivity(intent3);
             break;
         default:
             break;
         }
     }
 }

activity.C2

 package activity;

 import com.example.activityLaunchSingleInstance.R;

 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.Toast;

 public class C2 extends Activity implements OnClickListener{
     private Button btn_c1;//创建一个button对象
     private Button btn_c2;//创建一个button对象
     private Button btn_c3;//创建一个button对象
      protected void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);//父类操作
             setContentView(R.layout.activity_main);//引入名为activity_main的界面
             Log.d("C2", getTaskId()+"");
             setTitle("我是C2");
             btn_c1=(Button) findViewById(R.id.btn_c1);//找id为btn_openActivity的button
             btn_c2=(Button) findViewById(R.id.btn_c2);//找id为btn_openActivity的button
             btn_c3=(Button) findViewById(R.id.btn_c3);//找id为btn_openActivity的button
             btn_c1.setOnClickListener(this);
             btn_c2.setOnClickListener(this);
             btn_c3.setOnClickListener(this);
         }
     @Override
     public void onClick(View v) {
         // TODO Auto-generated method stub
         switch (v.getId()) {
         case R.id.btn_c1:
             Intent intent=new Intent();
             intent.setClass(C2.this, C1.class);
             startActivity(intent);
             break;
         case R.id.btn_c2:
             Intent intent2=new Intent();
             intent2.setClass(C2.this, C2.class);
             startActivity(intent2);
             break;
         case R.id.btn_c3:
             Intent intent3=new Intent();
             intent3.setClass(C2.this, C3.class);
             startActivity(intent3);
             break;
         default:
             break;
         }
     }

     @Override
     protected void onNewIntent(Intent intent) {
         // TODO Auto-generated method stub
         super.onNewIntent(intent);
         Toast.makeText(this, "onNewIntent", Toast.LENGTH_SHORT).show();
         Log.d("C2", "onNewIntent");
     }
 }

activity.C3

 package activity;

 import com.example.activityLaunchSingleInstance.R;

 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;

 public class C3 extends Activity implements OnClickListener{
     private Button btn_c1;//创建一个button对象
     private Button btn_c2;//创建一个button对象
     private Button btn_c3;//创建一个button对象
      protected void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);//父类操作
             setContentView(R.layout.activity_main);//引入名为activity_main的界面
             Log.d("C3", getTaskId()+"");
             setTitle("我是C3");
             btn_c1=(Button) findViewById(R.id.btn_c1);//找id为btn_openActivity的button
             btn_c2=(Button) findViewById(R.id.btn_c2);//找id为btn_openActivity的button
             btn_c3=(Button) findViewById(R.id.btn_c3);//找id为btn_openActivity的button
             btn_c1.setOnClickListener(this);
             btn_c2.setOnClickListener(this);
             btn_c3.setOnClickListener(this);
         }
     @Override
     public void onClick(View v) {
         // TODO Auto-generated method stub
         switch (v.getId()) {
         case R.id.btn_c1:
             Intent intent=new Intent();
             intent.setClass(C3.this, C1.class);
             startActivity(intent);
             break;
         case R.id.btn_c2:
             Intent intent2=new Intent();
             intent2.setClass(C3.this, C2.class);
             startActivity(intent2);
             break;
         case R.id.btn_c3:
             Intent intent3=new Intent();
             intent3.setClass(C3.this, C3.class);
             startActivity(intent3);
             break;
         default:
             break;
         }
     }
 }

/activityLaunchSingleInstance/AndroidManifest.xml

 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.example.activityLaunchSingleInstance"
     android:versionCode="1"
     android:versionName="1.0" >

     <uses-sdk
         android:minSdkVersion="8"
         android:targetSdkVersion="19" />

     <application
         android:allowBackup="true"
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"
         android:theme="@style/AppTheme" >
         <activity
             android:name="activity.C1"
             android:label="@string/app_name" >
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
         <activity android:name="activity.C2" android:launchMode="singleInstance">
             <intent-filter>
                 <action android:name="com.example.activityLaunchSingleTask" />
                 <category android:name="android.intent.category.DEFAULT" />
             </intent-filter>
         </activity>
         <activity android:name="activity.C3"></activity>
     </application>

 </manifest>