Differences
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smd:laboratoare:06 [2021/04/21 20:15] adriana.draghici [External storage] |
smd:laboratoare:06 [2021/05/20 21:30] (current) adriana.draghici [Shared preferences] |
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| <note important>Android API Level 29 introduced important changes to how storage is accessed, driven by the need for increased privacy. | <note important>Android API Level 29 introduced important changes to how storage is accessed, driven by the need for increased privacy. | ||
| - | It provided Scoped Storage([[https://developer.android.com/training/data-storage#scoped-storage|documentation]][[https://www.raywenderlich.com/9577211-scoped-storage-in-android-10-getting-started|tutorial]]). Api Level 30 also introduced some updates related to storage, check [[https://developer.android.com/about/versions/11/privacy/storage|this link]] for some information about them. </note> | + | It provided **Scoped Storage** ([[https://developer.android.com/training/data-storage#scoped-storage|documentation]], [[https://www.raywenderlich.com/9577211-scoped-storage-in-android-10-getting-started|tutorial]]). Api Level 30 also introduced some updates related to storage, check [[https://developer.android.com/about/versions/11/privacy/storage|this link]] for some information about them. </note> |
| ====Internal Storage==== | ====Internal Storage==== | ||
| Line 93: | Line 93: | ||
| sharedPref = this.getSharedPreferences("mysettings", Context.MODE_PRIVATE); | sharedPref = this.getSharedPreferences("mysettings", Context.MODE_PRIVATE); | ||
| // or | // or | ||
| - | sharedPref = PreferenceManager.getDefaultSharedPreferences(context); | + | sharedPref = PreferenceManager.getDefaultSharedPreferences(context); //!!! recently deprecated in API level 29 |
| </code> | </code> | ||
| Line 160: | Line 160: | ||
| Provide the functionality from tasks 1 and 2 using internal storage instead of external. | Provide the functionality from tasks 1 and 2 using internal storage instead of external. | ||
| * You can choose to store the file using one of the methods described in the [[smd:laboratoare:06##internal_storage|Internal Storage]] section. | * You can choose to store the file using one of the methods described in the [[smd:laboratoare:06##internal_storage|Internal Storage]] section. | ||
| - | * Log the path of the file, try to access it from the command line. | + | * Log the path of the file, try to access it from the command line (adb shell). |
| ==== Task 5 - Shared preferences ==== | ==== Task 5 - Shared preferences ==== | ||
| Line 170: | Line 170: | ||
| * When the user selects an item from the spinner, store it as a shared preference. Use [[https://developer.android.com/reference/android/widget/AdapterView.html#setOnItemSelectedListener(android.widget.AdapterView.OnItemSelectedListener)|setOnItemSelectedListener]]. | * When the user selects an item from the spinner, store it as a shared preference. Use [[https://developer.android.com/reference/android/widget/AdapterView.html#setOnItemSelectedListener(android.widget.AdapterView.OnItemSelectedListener)|setOnItemSelectedListener]]. | ||
| * When the user clicks Download, use an external or internal path, depending on the value stored in the shared preferences. If the value is "Undefined", show a toast telling the user to choose a type of storage. | * When the user clicks Download, use an external or internal path, depending on the value stored in the shared preferences. If the value is "Undefined", show a toast telling the user to choose a type of storage. | ||
| + | |||
| + | <spoiler Example > | ||
| + | <code java> | ||
| + | private String getStorageType() { | ||
| + | SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this); | ||
| + | return sharedPref.getString(getString(R.string.storage_type_key), "undefined"); | ||
| + | } | ||
| + | |||
| + | private void storeStorageType(String type) | ||
| + | SharedPreferences.Editor editor = PreferenceManager.getDefaultSharedPreferences(this).edit(); | ||
| + | editor.putString(getString(R.string.storage_type_key), type); | ||
| + | editor.apply(); | ||
| + | } | ||
| + | |||
| + | private class StorageTypeSelectedListener implements AdapterView.OnItemSelectedListener { | ||
| + | |||
| + | @Override | ||
| + | public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) { | ||
| + | String selectedItem = adapterView.getItemAtPosition(i).toString(); | ||
| + | Log.d(TAG, "Selected storage type: " + selectedItem); | ||
| + | storeStorageType(selectedItem); | ||
| + | } | ||
| + | |||
| + | @Override | ||
| + | public void onNothingSelected(AdapterView<?> adapterView) { | ||
| + | } | ||
| + | } | ||
| + | </code> | ||
| + | </spoiler> | ||
| | | ||
| Image manipulation code snippets: | Image manipulation code snippets: | ||
| Line 197: | Line 226: | ||
| * [[https://developer.android.com/guide/topics/data/data-storage|Android Data Storage documentation]] | * [[https://developer.android.com/guide/topics/data/data-storage|Android Data Storage documentation]] | ||
| * [[https://developer.android.com/about/versions/11/privacy/storage|Storage updates in Android 11]] | * [[https://developer.android.com/about/versions/11/privacy/storage|Storage updates in Android 11]] | ||
| - | * {{lab6-skel.zip|}} | + | * {{lab6_skel.zip|}} |
