当我尝试更改android:background活动的 XML 文件时遇到了这个问题。
Information:Gradle tasks [:app:assembleDebug]
C:\Users\Valentin\AndroidStudioProjects\CedarRestaurants4\CedarRestaurants3\app\src\main\res\layout\activity_dynamic_view_ordering.xml
Error:error: 'drawable/delete' is incompatible with attribute android:background (attr) reference|color.
Error:'drawable/delete' is incompatible with attribute android:background (attr) reference|color.
Error:failed linking file resources.
Error:java.util.concurrent.ExecutionException: java.util.concurrent.ExecutionException: com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details
Error:java.util.concurrent.ExecutionException: com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details
Error:com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details
Error:Execution failed for task ':app:processDebugResources'.
> Failed to execute aapt
Information:BUILD FAILED in 4s
Information:7 errors
Information:0 warnings
Information:See complete output in console
我的活动的 XML 文件： …
我正在开发一个具有动态视图数量的活动的应用程序。我遇到的问题是我不知道如何在 Firebase 中获取数组的大小。
这是我的代码供参考：
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_confirm_order);
parentLinearLayout = (LinearLayout) findViewById(R.id.parent_linear_layout);
final FirebaseAuth mAuth = FirebaseAuth.getInstance();
final DatabaseReference mCartReference = FirebaseDatabase.getInstance().getReference().child(mAuth.getCurrentUser().getUid().toString()).child("cart");
SharedPreferences mPrefs = getSharedPreferences("label", 0);
mString = mPrefs.getString("tabletIdNum", "default_value_if_variable_not_found");
appContext = getApplicationContext();
// generate items from sortedCart into Views
// for(int i = 0; i < mCartReference.child((mString)).child("sortedCart").size(); i++){
// generate number of views here
// }
Button confirmButton = findViewById(R.id.confirmOrderButton);
confirmButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ArrayList<String> items = new ArrayList<>(); …