Job Scheduler TARE page implementation

A Job Scheduler policy page is needed in the TARE developer options
settings to allow developers to both view and edit the current values of
all the factors under the job scheduler policy. The page uses a dropdown
so that the user can easily switch between the different policies. For
the factors with subfactors, the user simply clicks on the factor and
the subfactors wil pop up under it.

Bug: 191877052

Test: Manual (open Settings > System > Developer Options > TARE >
JobScheduler and verify all factors are there)

Change-Id: Icea6cda5e4b59d1736f85defcb9532839c3720f5

src/com/android/settings/development/tare/DropdownActivity.java

@@ -18,6 +18,7 @@ package com.android.settings.development.tare;
 import android.app.Activity;
 import android.app.Fragment;
 import android.app.FragmentTransaction;
+import android.content.Intent;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.AdapterView;
@@ -34,15 +35,26 @@ import com.android.settings.R;
 public class DropdownActivity extends Activity {
 
     private Fragment mAlarmManagerFragment;
+    private Fragment mJobSchedulerFragment;
     private Spinner mSpinner;
+    static final String EXTRA_POLICY = "policy";
+    static final int POLICY_ALARM_MANAGER = 0;
+    static final int POLICY_JOB_SCHEDULER = 1;
+    private static final int DEFAULT_POLICY = POLICY_ALARM_MANAGER;
+
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.tare_dropdown_page);
 
+        // Determines what policy fragment to open up to
+        Intent intent = getIntent();
+        int policy = intent.getIntExtra(EXTRA_POLICY, DEFAULT_POLICY);
+
         mSpinner = findViewById(R.id.spinner);
         mAlarmManagerFragment = new AlarmManagerFragment();
+        mJobSchedulerFragment = new JobSchedulerFragment();
 
         String[] policies = getResources().getStringArray(R.array.tare_policies);
 
@@ -51,11 +63,14 @@ public class DropdownActivity extends Activity {
         arrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
         mSpinner.setAdapter(arrayAdapter);
 
+        mSpinner.setSelection(policy);
+        selectFragment(policy);
+
         mSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
             @Override
             public void onItemSelected(AdapterView<?> adapterView, View view, int position,
                     long id) {
-                openFragment(mAlarmManagerFragment);
+                selectFragment(position);
             }
 
             @Override
@@ -64,7 +79,21 @@ public class DropdownActivity extends Activity {
         });
     }
 
-    /** Selects the correct policy fragment to display */
+    /** Selects the correct policy fragment to display based on user selection */
+    private void selectFragment(int policy) {
+        switch (policy) {
+            case POLICY_ALARM_MANAGER:
+                openFragment(mAlarmManagerFragment);
+                break;
+            case POLICY_JOB_SCHEDULER:
+                openFragment(mJobSchedulerFragment);
+                break;
+            default:
+                openFragment(mAlarmManagerFragment);
+        }
+    }
+
+    /** Opens the correct policy fragment */
     private void openFragment(Fragment fragment) {
         FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
         fragmentTransaction.replace(R.id.frame_layout, fragment);