Android :: AllowTaskReparenting And FLAG_ACTIVITY_CLEAR_TOP Conflict
Dec 14, 2009
I am using Android 2.0 and have the following situation:
CODE:..........
This activity belongs to a task that has a service running and is usually not killed, so even when I am in the home screen I see the task running on DDMS (I will call it Task A).
It is possible to start Activity A from another application (running on Task B). When it is launched, I assume Activity A is "reparented" to the Task A. I assume that, because the debugger stops on the breakpoint I have set on onCreate and I am debugging Task A only. Please, advise if this is not correct.
So at this point, as far as I can tell, Task A has only Activity A. When in this situation, the service running on Task A receives some event and puts a notification on the Notification bar. This notification, if clicked, will send an Intent that also starts Activity A (this Intent has flags FLAG_ACTIVITY_NEW_TASK and FLAG_ACTIVITY_CLEAR_TOP).
Now to the problem, what I expected is that, because of the CLEAR_TOP flag, Activity A would be destroyed and recreated, as it has standard launch mode. But what I observe is that another Activity A launches on top of the previous one. When I click BACK on the new instance of Activity A, the old instance is redisplayed, what for my use case is wrong. Note that this only happens when launching Activity A from another application. If I launch it from my application and click on the event on the notification bar, it is destroyed and relaunched.
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Oct 4, 2009
Before asking my doubt, let me clarify my understanding of allowTaskReparenting...
Suppose there exists a Task (say Task 1) and this task has an activity (say Activity 1) which wants to call my Activity (say Activity 2). Let my activity (activity 2) set the attribute allowTaskReparenting to true and let my activity have a specific taskAffinity(affinity1). When Activity1 calls my activity (activity2), my activity becomes part of the task1. But suppose another task (task2) is already present/created with the same taskAffinity as mine (affinity1) and an activity in that task (say activity3) tries to start my activity, my activity gets re- parented to task2.
Not sure if i was clear enough. If i were to rephrase my words...
If my activity has allowTaskReparenting set to true and an instance of my activity is already present in task1. If task2 with the same task affinity as my activity tries to start my activity, the EXISTING activity gets re-parented from task1 to task2.
My quesions:
(1) Is my understanding correct ?
(2) If I am correct then a single instance of my activity gets shifted from task1 to task2. So 2 activity objects of my activity are NOT created.
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Aug 17, 2010
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Intent intent = new Intent(this, MMConnection.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
this.startActivity(intent);
As I noticed that the transition was still a left to right animation, does someone know if there is a way to change system animation when starting an activity? Actually, I'd ideally like to have a right to left transition (like when the return button is tapped)
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A B C D
new stack
A B
But 'B' gets relaunched, its onCreate() method is called. Since B is already in the history stack, is there a way I can use this flag, but have it *not* recreate B, just onResume() it again? The reordering flags are kind of what I need too, but they won't pop C and D, just reshuffle the stack so B comes to the top, but I want C and D to go away.
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Code is here:
CODE:.................
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I'm writing an Android application that allows a user to maintain a list of products. In the EnterProductData activity, the user can enter information about the product into form fields, which will then save the info to a SQLite DB. The EnterProductData activity also allows the user to initiate a barcode scan via the Barcode Scanner app in order to capture the UPC code. The problem I'm facing is trying to set the value of the UPC text field in onActivityResult() once the barcode scan activity is complete and returns the value.
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EnterProductData.java
public class EnterProductData extends Activity {
private Button mScanButton;
private EditText mUPC;
private Button mSaveButton;
private Long mRowId;
private DbAdapter mDbHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mDbHelper = new DbAdapter(this);
mDbHelper.open();
setContentView(R.layout.enter_product_data);
mUPC = (EditText) findViewById(R.id.UPC);
mScanButton = (Button) findViewById(R.id.scanButton);
mSaveButton = (Button) findViewById(R.id.saveButton);
mRowId = (savedInstanceState == null) ? null :
(Long) savedInstanceState.getSerializable(DbAdapter.KEY_PRODUCT_ROWID);
if (mRowId == null) {
Bundle extras = getIntent().getExtras();
mRowId = extras != null ? extras.getLong(DbAdapter.KEY_PRODUCT_ROWID): null;}
populateFields();
mScanButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
IntentIntegrator.initiateScan(EnterProductData.this);}});
mSaveButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
setResult(RESULT_OK);
finish();}});
}private void populateFields() {
if (mRowId != null) {
Cursor product = mDbHelper.fetchProduct(mRowId);
startManagingCursor(product);
mUPC.setText(product.getString(
product.getColumnIndexOrThrow(DbAdapter.KEY_UPC))); //******}
}@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
saveState();
outState.putSerializable(DbAdapter.KEY_PRODUCT_ROWID, mRowId);
}@Override
protected void onPause() {
super.onPause();
saveState();
}@Override
protected void onResume() {
super.onResume();
populateFields();
}private void saveState() {String upc= mUPC.getText().toString();
if (mRowId == null) {
long id = mDbHelper.createProduct(mRowId, UPC);
if (id > 0) mRowId = id;
}} else {mDbHelper.updateProduct(mRowId, UPC);
}}protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch(requestCode) {
case IntentIntegrator.REQUEST_CODE: {
if (resultCode != RESULT_CANCELED) {
IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
if (scanResult != null) {
String upc = scanResult.getContents();
mUPC.setText(upc);
}}break;
}}}}
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CODE:.................
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CODE:............
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