1.BaseActivity

重寫onCreate()方法，新增下面程式碼，列印當前Activity名稱：

1. @Override
2. protectedvoid onCreate(@NullableBundle savedInstanceState){
3. super.onCreate(savedInstanceState);
4. Log.d("BaseActivity", getClass().getSimpleName());
5. }

增加ActivityCollector，管理Activity，程式碼如下：

1. publicclassActivityCollector{
2. publicstaticList<
   Activity> activities =newArrayList<>();
3. publicstaticvoid addActivity(Activity activity){
4.        activities.add(activity);
5. }
6. publicstaticvoid removeActivity(Activity activity){
7.        activities.remove(activity);
8. }
9. publicstaticvoid finishAll(){
10. for(Activity activity : activities){
11. if(!activity.isFinishing
    ()){
12.                activity.finish();
13. }
14. }
15. }
16. }

修改BaseActivity類，程式碼如下：

1. publicclassBaseActivityextendsAppCompatActivity{
2. @Override
3. protectedvoid onCreate(@NullableBundle savedInstanceState){
4. super.onCreate(savedInstanceState);
5. Log.d("BaseActivity", getClass().getSimpleName());
6. ActivityCollector.addActivity(
   this);
7. }
8. @Override
9. protectedvoid onDestroy(){
10. super.onDestroy();
11. ActivityCollector.removeActivity(this);
12. }
13. }

2.繼承BaseActivity，新增actionStart()方法

1. publicclassSecondActivityextendsBaseActivity{
2. publicstaticvoid actionStart(Context context,String data1,String data2){
3. Intent intent =newIntent(context,SecondActivity.class);
4.        intent.putExtra("param1", data1);
5.        intent.putExtra("param2", data2);
6.        context.startActivity(intent);
7. }
8. }

這樣寫的好處，啟動SecondActivity時，知道需要傳遞哪些引數，啟動程式碼如下：

1. SecondActivity.actionStart(FirstActivity.this,"data1","data2");