android 完全退出应用程序
16lz
2021-01-23
android退出应用程序会调用android.os.Process.killProcess(android.os.Process.myPid())或是System.exit(0),这只是针对第一个Activity(也就是入口的Activity)时生效。如果有A,B,C三个Activity,而想在B或C中Activity退出,调用上面的方法,往往会销毁当前的Activity返回上一个Activity。当然也可以逐个返回上一个Activity,直到跳转到入口的Activity,最后退出应用程序。但这样比较麻烦,而且逐个返回的体验并不友好。
网上比较流行的方法是定义栈,写一个ExitApplication类,利用单例模式管理Activity,在每个在Activity的onCreate()方法中调用ExitApplication.getInstance().addActivity(this)方法,在退出时调用ExitApplication.getInstance().exit()方法,就可以完全退出应用程序了。
ExitApplication类
代码如下:
view plain copy to clipboard print ?
- importjava.util.LinkedList;
- importjava.util.List;
- importandroid.app.Activity;
- importandroid.app.Application;
- publicclassExitApplicationextendsApplication {
- privateList activityList =newLinkedList();
- privatestaticExitApplication instance;
- privateExitApplication()
- {
- }
- //单例模式中获取唯一的ExitApplication实例
- publicstaticExitApplication getInstance()
- {
- if(null== instance)
- {
- instance =newExitApplication();
- }
- returninstance;
- }
- //添加Activity到容器中
- publicvoidaddActivity(Activity activity)
- {
- activityList.add(activity);
- }
- //遍历所有Activity并finish
- publicvoidexit()
- {
- for(Activity activity:activityList)
- {
- activity.finish();
- }
- System.exit(0);
- }
- }
- importjava.util.LinkedList;
- importjava.util.List;
- importandroid.app.Activity;
- importandroid.app.Application;
- publicclassExitApplicationextendsApplication{
- privateListactivityList=newLinkedList();
- privatestaticExitApplicationinstance;
- privateExitApplication()
- {
- }
- //单例模式中获取唯一的ExitApplication实例
- publicstaticExitApplicationgetInstance()
- {
- if(null==instance)
- {
- instance=newExitApplication();
- }
- returninstance;
- }
- //添加Activity到容器中
- publicvoidaddActivity(Activityactivity)
- {
- activityList.add(activity);
- }
- //遍历所有Activity并finish
- publicvoidexit()
- {
- for(Activityactivity:activityList)
- {
- activity.finish();
- }
- System.exit(0);
- }
- }
下面的三个类IndexActivity, BActivity,CActivity是简单的例子,分别是IndexActivity–>BActivity–>CActivity的跳转顺序。在每个Activity类中onCreate()方法中调用ExitApplication.getInstance().addActivity(Activity activity)方法。在任何一个Activity界面退出应用程序时,只要调用ExitApplication.getInstance().exit()方法,就可以在任何一个Activity中完全退出应用程序。
IndexActivity 类源代码:
- importandroid.app.Activity;
- importandroid.content.Intent;
- importandroid.os.Bundle;
- importandroid.view.View;
- importandroid.view.View.OnClickListener;
- importandroid.widget.Button;
- publicclassIndexActivityextendsActivity {
- /** Called when the activity is first created. */
- @Override
- publicvoidonCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- Button next=(Button)findViewById(R.id.next_to_b);
- next.setOnClickListener(nextClick);
- Button exit=(Button)findViewById(R.id.exit_main);
- exit.setOnClickListener(exitClick);
- ExitApplication.getInstance().addActivity(this);
- }
- OnClickListener nextClick=newOnClickListener() {
- @Override
- publicvoidonClick(View v) {
- // TODO Auto-generated method stub
- Intent intent=newIntent(IndexActivity.this,BActivity.class);
- startActivity(intent);
- }
- };
- OnClickListener exitClick=newOnClickListener() {
- @Override
- publicvoidonClick(View v) {
- // TODO Auto-generated method stub
- ExitApplication.getInstance().exit();
- }
- };
- }
- importandroid.app.Activity;
- importandroid.content.Intent;
- importandroid.os.Bundle;
- importandroid.view.View;
- importandroid.view.View.OnClickListener;
- importandroid.widget.Button;
- publicclassIndexActivityextendsActivity{
- /**Calledwhentheactivityisfirstcreated.*/
- @Override
- publicvoidonCreate(BundlesavedInstanceState){
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- Buttonnext=(Button)findViewById(R.id.next_to_b);
- next.setOnClickListener(nextClick);
- Buttonexit=(Button)findViewById(R.id.exit_main);
- exit.setOnClickListener(exitClick);
- ExitApplication.getInstance().addActivity(this);
- }
- OnClickListenernextClick=newOnClickListener(){
- @Override
- publicvoidonClick(Viewv){
- //TODOAuto-generatedmethodstub
- Intentintent=newIntent(IndexActivity.this,BActivity.class);
- startActivity(intent);
- }
- };
- OnClickListenerexitClick=newOnClickListener(){
- @Override
- publicvoidonClick(Viewv){
- //TODOAuto-generatedmethodstub
- ExitApplication.getInstance().exit();
- }
- };
- }
BActivity 类源代码:
view plain copy to clipboard print ?- importandroid.app.Activity;
- importandroid.content.Intent;
- importandroid.os.Bundle;
- importandroid.view.View;
- importandroid.view.View.OnClickListener;
- importandroid.widget.Button;
- publicclassBActivityextendsActivity {
- @Override
- protectedvoidonCreate(Bundle savedInstanceState) {
- // TODO Auto-generated method stub
- super.onCreate(savedInstanceState);
- setContentView(R.layout.b);
- Button next_to_c=(Button)findViewById(R.id.next_to_c);
- next_to_c.setOnClickListener(next_to_cClick);
- Button exit_b=(Button)findViewById(R.id.exit_b);
- exit_b.setOnClickListener(exitClick);
- ExitApplication.getInstance().addActivity(this);
- }
- OnClickListener next_to_cClick=newOnClickListener() {
- @Override
- publicvoidonClick(View v) {
- // TODO Auto-generated method stub
- Intent intent=newIntent(BActivity.this,CActivity.class);
- startActivity(intent);
- }
- };
- OnClickListener exitClick=newOnClickListener() {
- @Override
- publicvoidonClick(View v) {
- // TODO Auto-generated method stub
- ExitApplication.getInstance().exit();
- }
- };
- }
- importandroid.app.Activity;
- importandroid.content.Intent;
- importandroid.os.Bundle;
- importandroid.view.View;
- importandroid.view.View.OnClickListener;
- importandroid.widget.Button;
- publicclassBActivityextendsActivity{
- @Override
- protectedvoidonCreate(BundlesavedInstanceState){
- //TODOAuto-generatedmethodstub
- super.onCreate(savedInstanceState);
- setContentView(R.layout.b);
- Buttonnext_to_c=(Button)findViewById(R.id.next_to_c);
- next_to_c.setOnClickListener(next_to_cClick);
- Buttonexit_b=(Button)findViewById(R.id.exit_b);
- exit_b.setOnClickListener(exitClick);
- ExitApplication.getInstance().addActivity(this);
- }
- OnClickListenernext_to_cClick=newOnClickListener(){
- @Override
- publicvoidonClick(Viewv){
- //TODOAuto-generatedmethodstub
- Intentintent=newIntent(BActivity.this,CActivity.class);
- startActivity(intent);
- }
- };
- OnClickListenerexitClick=newOnClickListener(){
- @Override
- publicvoidonClick(Viewv){
- //TODOAuto-generatedmethodstub
- ExitApplication.getInstance().exit();
- }
- };
- }
CActivity 类源代码:
view plain copy to clipboard print ?- importandroid.app.Activity;
- importandroid.os.Bundle;
- importandroid.view.View;
- importandroid.view.View.OnClickListener;
- importandroid.widget.Button;
- publicclassCActivityextendsActivity{
- @Override
- protectedvoidonCreate(Bundle savedInstanceState) {
- // TODO Auto-generated method stub
- super.onCreate(savedInstanceState);
- setContentView(R.layout.c);
- Button exit_c=(Button)findViewById(R.id.exit_c);
- exit_c.setOnClickListener(exitClick);
- ExitApplication.getInstance().addActivity(this);
- }
- OnClickListener exitClick=newOnClickListener() {
- @Override
- publicvoidonClick(View v) {
- // TODO Auto-generated method stub
- ExitApplication.getInstance().exit();
- //如果只是调用以下其中的一个方法,并不会完全退出应用
- //android.os.Process.killProcess(android.os.Process.myPid());
- //System.exit(0);
- }
- };
- }
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