hzuapps#4 提交实验4代码

students/com171408901141/app/src/main/AndroidManifest.xml

@@ -16,10 +16,11 @@
         </activity>
         <activity
             android:name=".Com1714080901141MainActivity"
-            android:label="@string/app_name">
+            android:label="@string/app_name"
+            android:launch="singleTask">
+
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>

students/com171408901141/app/src/main/java/edu/hzuapps/androidlabs/com1714080901141/Com1714080901141DialogActivity.java

@@ -9,14 +9,17 @@
 public class Com1714080901141DialogActivity extends Com1714080901141BaseActivity {
 
     @Override
-    protected void onCreate(Bundle savedInstanceState) {
+    protected void onCreate(Bundle savedInstanceState) {//This is DialogActivity's onCreate function.
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_dialog);
         Button select_yes=(Button) findViewById(R.id.hope_to_exit);
         Button select_no=(Button) findViewById(R.id.regret_to_exit);
         select_no.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
+                Intent intent=new Intent(Com1714080901141DialogActivity.this,Com1714080901141MainActivity.class);
+                //Its launcher is singleTask,so it will start the old one instead of a new one.
+                startActivity(intent);
                 finish();//exit dialog activity
 
             }
@@ -28,6 +31,5 @@ public void onClick(View v) {
                 Com1714080901141ActivityCollector.finishAll();//exit all activity
             }
         });
-
     }
 }

students/com171408901141/app/src/main/java/edu/hzuapps/androidlabs/com1714080901141/Com1714080901141MainActivity.java

@@ -42,11 +42,10 @@ public boolean onNavigationItemSelected(@NonNull MenuItem item) {
     public void onBackPressed() {
         Intent intent=new Intent(Com1714080901141MainActivity.this,Com1714080901141DialogActivity.class);
         startActivity(intent);
-    }
-
+    };
 
     @Override
-    protected void onCreate(Bundle savedInstanceState) {
+    protected void onCreate(Bundle savedInstanceState) {//This is MainActivity's onCreate function.
         super.onCreate(savedInstanceState);
         exit=false;
         setContentView(R.layout.activity_main);