To exit multiple activities.

To exit multiple activities.
1. Use the List set method

Use list to save activity instances and then kill them one by one

Import java. util. using list; import java. util. list; import android. app. activity; import android. app. alertDialog; import android. app. application; import android. content. dialogInterface; import android. content. intent; public class SysApplication extends Application {private List <Activity> mList = new extenlist <Activity> (); private static SysApplication instance; private SysApplication () {} public synchronized Static SysApplication getInstance () {if (null = instance) {instance = new SysApplication ();} return instance;} // add Activitypublic void addActivity (Activity activity) {mList. add (activity);} public void exit () {try {for (Activity activity: mList) {if (activity! = Null) activity. finish () ;}} catch (Exception e) {e. printStackTrace ();} finally {// System. exit (0); // remove this} @ Overridepublic void onLowMemory () {super. onLowMemory (); System. gc () ;}} added similar code in the onCreate method of each Activity: public void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); SysApplication. getInstance (). addActivity (this );}

To exit the program, call:

SysApplication.getInstance().exit();

In short, you can add reference of each Activity to a global linked list in singleton mode. Each time you exit a program and call System. exit (0), you must first call the finish method of the Activity in the linked list.

Advantages: simple implementation and clear logic

2. Use Broadcast

Recommended !! Convenient !!

The basic logic is: Define a BaseActivity, bind broadcast to this Activity, and call finish () in the onReceive method of the broadcast; then all subsequent activities inherit this Activity, and send broadcast when exiting, exit BaseActivity. The parent activity exits and the Child activity exits.

The Code is as follows:

Import android. content. broadcastReceiver; import android. content. context; import android. content. intent; import android. content. intentFilter; import android. support. v7.app. appCompatActivity; public class BaseActivity extends AppCompatActivity {protected BroadcastReceiver broadcastReceiver = new BroadcastReceiver () {@ Override public void onReceive (Context context, Intent intent) {finish ();}}; @ Override public void onResume () {super. onResume (); // register the broadcast IntentFilter filter = new IntentFilter (); filter in the current activity. addAction ("ExitApp"); this. registerReceiver (this. broadcastReceiver, filter) ;}@ Override protected void onDestroy () {// TODO Auto-generated method stub super. onDestroy (); // unbind this. unregisterReceiver (this. broadcastReceiver );}}

An Activity instance:

Import android. content. intent; import android. support. v7.app. appCompatActivity; import android. OS. bundle; import android. util. log; import android. view. keyEvent; import android. view. view; import android. widget. button; import android. widget. toast; public class ActivityC extends BaseActivity {Button btn; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_activity_c); SysApplication. getInstance (). addActivity (this); btn = (Button) findViewById (R. id. acticityc_btn); // close all activity btn. setOnClickListener (new View. onClickListener () {@ Override public void onClick (View view) {}});}/*** capture the mobile phone physical menu key */private long exitTime = 0; @ Override public boolean onKeyDown (int keyCode, KeyEvent event) {if (keyCode = KeyEvent. KEYCODE_BACK) {// & event. getAction () = KeyEvent. ACTION_DOWN if (System. currentTimeMillis ()-exitTime)> 2000) {Toast. makeText (getApplicationContext (), "exit the program again", Toast. LENGTH_SHORT ). show (); exitTime = System. currentTimeMillis () ;}else {myExit () ;}return true ;}return super. onKeyDown (keyCode, event);} protected void myExit () {// second exit method // SysApplication. getInstance (). exit (); Intent intent = new Intent (); intent. setAction ("ExitApp"); this. sendBroadcast (intent); // super. finish () ;}@ Override protected void onStop () {super. onStop (); Log. I ("tag", "ActivityC-onStop") ;}@ Override protected void onDestroy () {super. onDestroy (); Log. I ("tag", "ActivityC-onDestroy ");}}

This is called at the exit:

Private long exitTime = 0; @ Override public boolean onKeyDown (int keyCode, KeyEvent event) {if (keyCode = KeyEvent. KEYCODE_BACK) {// & event. getAction () = KeyEvent. ACTION_DOWN if (System. currentTimeMillis ()-exitTime)> 2000) {Toast. makeText (getApplicationContext (), "exit the program again", Toast. LENGTH_SHORT ). show (); exitTime = System. currentTimeMillis () ;}else {myExit () ;}return true ;}return super. onKeyDown (keyCode, event);} protected void myExit () {// second exit method // SysApplication. getInstance (). exit (); Intent intent = new Intent (); intent. setAction ("ExitApp"); this. sendBroadcast (intent); // super. finish ();}

Advantages: Convenient and convenient !! You only need to send a broadcast at the exit !!

This is the output when I exit:

08-09 15:33:48.869 26919-26919/example.com.closeapp I/tag: MainActivity-onPause08-09 15:33:49.279 26919-26919/example.com.closeapp I/tag: MainActivity-onStop08-09 15:33:51.569 26919-26959/example.com.closeapp D/OpenGLRenderer: endAllStagingAnimators on 0x55850598b0 (RippleDrawable) with handle 0x558504151008-09 15:33:56.079 26919-26919/example.com.closeapp I/tag: MainActivity-onDestroy08-09 15:33:56.089 26919-26919/example.com.closeapp I/tag: ActivityB-onDestroy08-09 15:33:56.399 26919-26919/example.com.closeapp I/tag: ActivityC-onDestroy