incompatible types: MainActivity cannot be converted to LifecycleOwner

debugcn Published at Dev

Marwa Eltayeb

MainActivity cannot be converted to LifecycleOwner I used this as LiveCycle Owner, but it is rejected and I got an error as you see in the picture. I work on Api 25 and I this the problem may be related to this version This is info about my sdk

compileSdkVersion 25
buildToolsVersion '25.0.2'

This is my code:

private void retrieveTasks() {
    Log.d(TAG, "Actively retrieving the tasks from the DataBase");
    // Extract all this logic outside the Executor and remove the Executor
    // Fix compile issue by wrapping the return type with LiveData
    LiveData<List<TaskEntry>> tasks = mDb.taskDao().loadAllTasks();
    // Observe tasks and move the logic from runOnUiThread to onChanged
    tasks.observe(this, new Observer<List<TaskEntry>>() {
        @Override
        public void onChanged(@Nullable List<TaskEntry> taskEntries) {
            Log.d(TAG, "Receiving database update from LiveData");
            mAdapter.setTasks(taskEntries);
        }
    });
}

I put LiveData dependencies in my Gradle

compile "android.arch.lifecycle:extensions:1.0.0"
annotationProcessor "android.arch.lifecycle:compiler:1.0.0"

If anyone knows the reason for the problem, let me know please

AmrDeveloper

Good question

Fragments and Activities in Support Library 26.1.0 and later already implement the LifecycleOwner interface by default

but in version 25 you need to implement LifecycleOwner interface for example

public class MyActivity extends Activity implements LifecycleOwner {
    private LifecycleRegistry mLifecycleRegistry;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mLifecycleRegistry = new LifecycleRegistry(this);
        mLifecycleRegistry.markState(Lifecycle.State.CREATED);
    }

    @Override
    public void onStart() {
        super.onStart();
        mLifecycleRegistry.markState(Lifecycle.State.STARTED);
    }

    @NonNull
    @Override
    public Lifecycle getLifecycle() {
        return mLifecycleRegistry;
    }
}

Source : Handling lifecycles with lifecycle-aware components

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