Android Activity的4种启动模式详解（代码+截图）

最近研究android内核，学习到android activity的启动模式，掌握好启动模式，对activity的处理例如关闭和开启，以及数据间的传输有很大的帮助。

看此博文前，请花点时间先看一下一个博主写的：http://www.cnblogs.com/lwbqqyumidi/p/3771542.html，有助于下面理解。。

我们同4个activity的启动来看其中的原理。。。。。。

下面是xml文件（很简单）：

first.xml

其他的类似。。。。

通过standard启动：

4个activity的定义：

public class Activity1 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);Log.v("Standard", "activity1 oncreate");setContentView(R.layout.first);TextView textView=(TextView) findViewById(R.id.textView1);TextView textIdView=(TextView) findViewById(R.id.textIdView1);textView.setText(this.toString());textIdView.setText("current task id:"+this.getTaskId());Button bt=(Button) findViewById(R.id.button1);bt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent=new Intent(Activity1.this,Activity2.class);startActivity(intent);}});}@Overrideprotected void onStart() {super.onStart();Log.v("Standard", "activity1 onStart");}@Overrideprotected void onPause() {super.onPause();Log.v("Standard", "activity1 onPause");}@Overrideprotected void onStop() {super.onStop();Log.v("Standard", "activity1 onStop");}@Overrideprotected void onDestroy() {super.onDestroy();Log.v("Standard", "activity1 onDestroy");}}

public class Activity2 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.second);Log.v("SingleInstance", "activity2 oncreate");TextView textView=(TextView) findViewById(R.id.textView2);TextView textIdView=(TextView) findViewById(R.id.textIdView2);textView.setText(this.toString());textIdView.setText("current task id:"+this.getTaskId());Button bt = (Button) findViewById(R.id.button2);bt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(Activity2.this, Activity3.class);startActivity(intent);}});}@Overrideprotected void onStart() {super.onStart();Log.v("SingleInstance", "activity2 onStart");}@Overrideprotected void onPause() {super.onPause();Log.v("SingleInstance", "activity2 onPause");}@Overrideprotected void onStop() {super.onStop();Log.v("SingleInstance", "activity2 onStop");}@Overrideprotected void onDestroy() {super.onDestroy();Log.v("SingleInstance", "activity2 onDestroy");}}

public class Activity3 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.third);Log.v("SingleInstance", "activity3 oncreate");TextView textView=(TextView) findViewById(R.id.textView3);TextView textIdView=(TextView) findViewById(R.id.textIdView3);textView.setText(this.toString());textIdView.setText("current task id:"+this.getTaskId());Button bt = (Button) findViewById(R.id.button3);bt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(Activity3.this, Activity4.class);startActivity(intent);}});}@Overrideprotected void onStart() {super.onStart();Log.v("SingleInstance", "activity3 onStart");}@Overrideprotected void onPause() {super.onPause();Log.v("SingleInstance", "activity3 onPause");}@Overrideprotected void onStop() {super.onStop();Log.v("SingleInstance", "activity3 onStop");}@Overrideprotected void onDestroy() {super.onDestroy();Log.v("SingleInstance", "activity3 onDestroy");}}

public class Activity4 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.forth);Log.v("SingleInstance", "activity4 oncreate");TextView textView = (TextView) findViewById(R.id.textView4);TextView textIdView = (TextView) findViewById(R.id.textIdView4);textView.setText(this.toString());textIdView.setText("current task id:"+this.getTaskId());Button bt = (Button) findViewById(R.id.button4);//bt.setText("forth go to forth");bt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {//Intent intent = new Intent(Activity4.this, Activity4.class);Intent intent = new Intent(Activity4.this, Activity1.class);startActivity(intent);}});}@Overrideprotected void onStart() {super.onStart();Log.v("SingleInstance", "activity4 onStart");}@Overrideprotected void onPause() {super.onPause();Log.v("SingleInstance", "activity4 onPause");}@Overrideprotected void onStop() {super.onStop();Log.v("SingleInstance", "activity4 onStop");}@Overrideprotected void onDestroy() {super.onDestroy();Log.v("SingleInstance", "activity4 onDestroy");}}

AndroidManifest.xml的配置：

        <!-- standard -->        <activity android:name="pers.running203.androidlaunchmodetest.standard.activity.Activity1">            <intent-filter >                <action android:name="android.intent.action.MAIN"/>                <category android:name="android.intent.category.LAUNCHER"/>            </intent-filter>        </activity>        <activity android:name="pers.running203.androidlaunchmodetest.standard.activity.Activity2"></activity>        <activity android:name="pers.running203.androidlaunchmodetest.standard.activity.Activity3"></activity>        <activity android:name="pers.running203.androidlaunchmodetest.standard.activity.Activity4"></activity>

我们通过其打出来的日志来分析通过standard模式启动的过程：

启动顺序：

activity1->activity2->activity3->activity4->activity1

返回退出：

总结：activity的启动模式如果使用standard，那么每启动一个activity就会生成一个activity对象，将每个activity入栈，后退关闭时，需要一个个返回关闭，最先启动的最后关闭。

通过singleTop启动：

4个activity的定义：

public class Activity1 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);Log.v("SingleTop", "activity1 oncreate");setContentView(R.layout.first);TextView textView=(TextView) findViewById(R.id.textView1);TextView textIdView=(TextView) findViewById(R.id.textIdView1);textView.setText(this.toString());textIdView.setText("current task id:"+this.getTaskId());Button bt=(Button) findViewById(R.id.button1);bt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent=new Intent(Activity1.this,Activity2.class);startActivity(intent);}});}@Overrideprotected void onStart() {super.onStart();Log.v("SingleTop", "activity1 onStart");}@Overrideprotected void onPause() {super.onPause();Log.v("SingleTop", "activity1 onPause");}@Overrideprotected void onStop() {super.onStop();Log.v("SingleTop", "activity1 onStop");}@Overrideprotected void onDestroy() {super.onDestroy();Log.v("SingleTop", "activity1 onDestroy");}}

public class Activity2 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.second);Log.v("SingleTop", "activity2 oncreate");TextView textView=(TextView) findViewById(R.id.textView2);TextView textIdView=(TextView) findViewById(R.id.textIdView2);textView.setText(this.toString());textIdView.setText("current task id:"+this.getTaskId());Button bt = (Button) findViewById(R.id.button2);bt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(Activity2.this, Activity3.class);startActivity(intent);}});}@Overrideprotected void onStart() {super.onStart();Log.v("SingleTop", "activity2 onStart");}@Overrideprotected void onPause() {super.onPause();Log.v("SingleTop", "activity2 onPause");}@Overrideprotected void onStop() {super.onStop();Log.v("SingleTop", "activity2 onStop");}@Overrideprotected void onDestroy() {super.onDestroy();Log.v("SingleTop", "activity2 onDestroy");}}

public class Activity3 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.third);Log.v("SingleTop", "activity3 oncreate");TextView textView=(TextView) findViewById(R.id.textView3);TextView textIdView=(TextView) findViewById(R.id.textIdView3);textView.setText(this.toString());textIdView.setText("current task id:"+this.getTaskId());Button bt = (Button) findViewById(R.id.button3);bt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(Activity3.this, Activity4.class);startActivity(intent);}});}@Overrideprotected void onStart() {super.onStart();Log.v("SingleTop", "activity3 onStart");}@Overrideprotected void onPause() {super.onPause();Log.v("SingleTop", "activity3 onPause");}@Overrideprotected void onStop() {super.onStop();Log.v("SingleTop", "activity3 onStop");}@Overrideprotected void onDestroy() {super.onDestroy();Log.v("SingleTop", "activity3 onDestroy");}}

public class Activity4 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.forth);Log.v("SingleTop", "activity4 oncreate");TextView textView = (TextView) findViewById(R.id.textView4);TextView textIdView = (TextView) findViewById(R.id.textIdView4);textView.setText(this.toString());textIdView.setText("current task id:"+this.getTaskId());Button bt = (Button) findViewById(R.id.button4);bt.setText("forth go to forth");bt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(Activity4.this, Activity4.class);startActivity(intent);}});}@Overrideprotected void onStart() {super.onStart();Log.v("SingleTop", "activity4 onStart");}@Overrideprotected void onPause() {super.onPause();Log.v("SingleTop", "activity4 onPause");}@Overrideprotected void onStop() {super.onStop();Log.v("SingleTop", "activity4 onStop");}@Overrideprotected void onDestroy() {super.onDestroy();Log.v("SingleTop", "activity4 onDestroy");}}

AndroidManifest.xml的配置：

        <!--singleTop -->        <activity android:launchMode="singleTop" android:name="pers.running203.androidlaunchmodetest.singletop.activity.Activity1">            <intent-filter >                <action android:name="android.intent.action.MAIN"/>                <category android:name="android.intent.category.LAUNCHER"/>            </intent-filter>        </activity>        <activity android:launchMode="singleTop" android:name="pers.running203.androidlaunchmodetest.singletop.activity.Activity2"></activity>        <activity android:launchMode="singleTop" android:name="pers.running203.androidlaunchmodetest.singletop.activity.Activity3"></activity>        <activity android:launchMode="singleTop" android:name="pers.running203.androidlaunchmodetest.singletop.activity.Activity4"></activity>

启动顺序：

activity1->activity2->activity3->activity4->activity4

返回退出：

总结：activity的启动模式如果使用singleTop时，如果一个activity生成对象放于栈顶，这时如果要启动一个相同的activity对象，不会重新生成该activity对象，而是直接从栈顶去该activity对象出来使用，同样返回关闭时，需要将每个activity依次后退关闭，最终才能将程序关闭。

通过singleTask启动：

4个activity的定义：

public class Activity1 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);Log.v("SingleTask", "activity1 oncreate");setContentView(R.layout.first);TextView textView=(TextView) findViewById(R.id.textView1);TextView textIdView=(TextView) findViewById(R.id.textIdView1);textView.setText(this.toString());textIdView.setText("current task id:"+this.getTaskId());Button bt=(Button) findViewById(R.id.button1);bt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent=new Intent(Activity1.this,Activity2.class);startActivity(intent);}});}@Overrideprotected void onStart() {super.onStart();Log.v("SingleTask", "activity1 onStart");}@Overrideprotected void onPause() {super.onPause();Log.v("SingleTask", "activity1 onPause");}@Overrideprotected void onStop() {super.onStop();Log.v("SingleTask", "activity1 onStop");}@Overrideprotected void onDestroy() {super.onDestroy();Log.v("SingleTask", "activity1 onDestroy");}}

public class Activity2 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.second);Log.v("SingleTask", "activity2 oncreate");TextView textView=(TextView) findViewById(R.id.textView2);TextView textIdView=(TextView) findViewById(R.id.textIdView2);textView.setText(this.toString());textIdView.setText("current task id:"+this.getTaskId());Button bt = (Button) findViewById(R.id.button2);bt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(Activity2.this, Activity3.class);startActivity(intent);}});}@Overrideprotected void onStart() {super.onStart();Log.v("SingleTask", "activity2 onStart");}@Overrideprotected void onPause() {super.onPause();Log.v("SingleTask", "activity2 onPause");}@Overrideprotected void onStop() {super.onStop();Log.v("SingleTask", "activity2 onStop");}@Overrideprotected void onDestroy() {super.onDestroy();Log.v("SingleTask", "activity2 onDestroy");}}

public class Activity3 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.third);Log.v("SingleTask", "activity3 oncreate");TextView textView=(TextView) findViewById(R.id.textView3);TextView textIdView=(TextView) findViewById(R.id.textIdView3);textView.setText(this.toString());textIdView.setText("current task id:"+this.getTaskId());Button bt = (Button) findViewById(R.id.button3);bt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(Activity3.this, Activity4.class);startActivity(intent);}});}@Overrideprotected void onStart() {super.onStart();Log.v("SingleTask", "activity3 onStart");}@Overrideprotected void onPause() {super.onPause();Log.v("SingleTask", "activity3 onPause");}@Overrideprotected void onStop() {super.onStop();Log.v("SingleTask", "activity3 onStop");}@Overrideprotected void onDestroy() {super.onDestroy();Log.v("SingleTask", "activity3 onDestroy");}}

public class Activity4 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.forth);Log.v("SingleTask", "activity4 oncreate");TextView textView = (TextView) findViewById(R.id.textView4);TextView textIdView = (TextView) findViewById(R.id.textIdView4);textView.setText(this.toString());textIdView.setText("current task id:"+this.getTaskId());Button bt = (Button) findViewById(R.id.button4);//bt.setText("forth go to forth");bt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {//Intent intent = new Intent(Activity4.this, Activity4.class);Intent intent = new Intent(Activity4.this, Activity2.class);startActivity(intent);}});}@Overrideprotected void onStart() {super.onStart();Log.v("SingleTask", "activity4 onStart");}@Overrideprotected void onPause() {super.onPause();Log.v("SingleTask", "activity4 onPause");}@Overrideprotected void onStop() {super.onStop();Log.v("SingleTask", "activity4 onStop");}@Overrideprotected void onDestroy() {super.onDestroy();Log.v("SingleTask", "activity4 onDestroy");}}

AndroidManifest.xml的配置：

        <!-- singleTask -->        <activity android:launchMode="singleTask" android:name="pers.running203.androidlaunchmodetest.singletask.activity.Activity1">            <intent-filter >                <action android:name="android.intent.action.MAIN"/>                <category android:name="android.intent.category.LAUNCHER"/>            </intent-filter>        </activity>        <activity android:launchMode="singleTask" android:name="pers.running203.androidlaunchmodetest.singletask.activity.Activity2"></activity>        <activity android:launchMode="singleTask" android:name="pers.running203.androidlaunchmodetest.singletask.activity.Activity3"></activity>        <activity android:launchMode="singleTask" android:name="pers.running203.androidlaunchmodetest.singletask.activity.Activity4"></activity>

启动顺序：

activity1->activity2->activity3->activity4->activity1

返回退出：

启动顺序：

activity1->activity2->activity3->activity4->activity4->activity4->activity4

返回退出：

启动顺序：

activity1->activity2->activity3->activity4->activity2

总结：activity的启动模式如果使用singleTask时，启动activity时，生成activity对象，并依次入栈，当一个activity想跳转到另外一个activity时，不会马上生成对象，而是从栈里寻找是否已经存在该activity对象，如果存在，将栈顶activity对象依次出栈，并且销毁，直到得到该activity对象。返回退出时，依次将栈顶activity对象出栈销毁，最后退出程序。

通过singleTask启动：

4个activity的定义：

public class Activity1 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);Log.v("SingleInstance", "activity1 oncreate");setContentView(R.layout.first);TextView textView=(TextView) findViewById(R.id.textView1);TextView textIdView=(TextView) findViewById(R.id.textIdView1);textView.setText(this.toString());textIdView.setText("current task id:"+this.getTaskId());Button bt=(Button) findViewById(R.id.button1);bt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent=new Intent(Activity1.this,Activity2.class);startActivity(intent);}});}@Overrideprotected void onStart() {super.onStart();Log.v("SingleInstance", "activity1 onStart");}@Overrideprotected void onPause() {super.onPause();Log.v("SingleInstance", "activity1 onPause");}@Overrideprotected void onStop() {super.onStop();Log.v("SingleInstance", "activity1 onStop");}@Overrideprotected void onDestroy() {super.onDestroy();Log.v("SingleInstance", "activity1 onDestroy");}}

public class Activity2 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.second);Log.v("SingleInstance", "activity2 oncreate");TextView textView=(TextView) findViewById(R.id.textView2);TextView textIdView=(TextView) findViewById(R.id.textIdView2);textView.setText(this.toString());textIdView.setText("current task id:"+this.getTaskId());Button bt = (Button) findViewById(R.id.button2);bt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(Activity2.this, Activity3.class);startActivity(intent);}});}@Overrideprotected void onStart() {super.onStart();Log.v("SingleInstance", "activity2 onStart");}@Overrideprotected void onPause() {super.onPause();Log.v("SingleInstance", "activity2 onPause");}@Overrideprotected void onStop() {super.onStop();Log.v("SingleInstance", "activity2 onStop");}@Overrideprotected void onDestroy() {super.onDestroy();Log.v("SingleInstance", "activity2 onDestroy");}}

public class Activity3 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.third);Log.v("SingleInstance", "activity3 oncreate");TextView textView=(TextView) findViewById(R.id.textView3);TextView textIdView=(TextView) findViewById(R.id.textIdView3);textView.setText(this.toString());textIdView.setText("current task id:"+this.getTaskId());Button bt = (Button) findViewById(R.id.button3);bt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(Activity3.this, Activity4.class);startActivity(intent);}});}@Overrideprotected void onStart() {super.onStart();Log.v("SingleInstance", "activity3 onStart");}@Overrideprotected void onPause() {super.onPause();Log.v("SingleInstance", "activity3 onPause");}@Overrideprotected void onStop() {super.onStop();Log.v("SingleInstance", "activity3 onStop");}@Overrideprotected void onDestroy() {super.onDestroy();Log.v("SingleInstance", "activity3 onDestroy");}}

public class Activity4 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.forth);Log.v("SingleInstance", "activity4 oncreate");TextView textView = (TextView) findViewById(R.id.textView4);TextView textIdView = (TextView) findViewById(R.id.textIdView4);textView.setText(this.toString());textIdView.setText("current task id:"+this.getTaskId());Button bt = (Button) findViewById(R.id.button4);//bt.setText("forth go to forth");bt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {//Intent intent = new Intent(Activity4.this, Activity4.class);Intent intent = new Intent(Activity4.this, Activity1.class);startActivity(intent);}});}@Overrideprotected void onStart() {super.onStart();Log.v("SingleInstance", "activity4 onStart");}@Overrideprotected void onPause() {super.onPause();Log.v("SingleInstance", "activity4 onPause");}@Overrideprotected void onStop() {super.onStop();Log.v("SingleInstance", "activity4 onStop");}@Overrideprotected void onDestroy() {super.onDestroy();Log.v("SingleInstance", "activity4 onDestroy");}}

AndroidManifest.xml的配置：

        <!--singleInstance -->        <activity android:launchMode="singleInstance" android:name="pers.running203.androidlaunchmodetest.singleinstance.activity.Activity1">            <intent-filter >                <action android:name="android.intent.action.MAIN"/>                <category android:name="android.intent.category.LAUNCHER"/>            </intent-filter>        </activity>        <activity android:launchMode="singleInstance" android:name="pers.running203.androidlaunchmodetest.singleinstance.activity.Activity2"></activity>        <activity android:launchMode="singleInstance" android:name="pers.running203.androidlaunchmodetest.singleinstance.activity.Activity3"></activity>        <activity android:launchMode="singleInstance" android:name="pers.running203.androidlaunchmodetest.singleinstance.activity.Activity4"></activity>

启动顺序：

activity1->activity2->activity3->activity4->activity1

返回退出：

总结：activity的启动模式如果使用singleInstance时，没启动一个activity，android系统会单独给每个activity对象一个栈结构，用于存放该activity对象。如果启动的activity已经有存在栈中，还是会生成activity对象，存入该栈。退出返回时，最先将当前栈里的activity对象出栈销毁，再依次后退销毁其他的栈里的activity对象。

至此全部总结完毕，如果我理解有错误，欢迎指正，在此先谢过，如果能帮到你，请给我点一下赞，谢谢。

项目源码请去http://download.csdn.net/download/qq_33678647/10033374下载！！