Bundle injection with Dagger Benoît Quenaudon @oldergod

public class InputActivity extends Activity { @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_input); final EditText editText = findViewById(R.id.edit_text); }a }b

public class InputActivity extends Activity { @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_input); final EditText editText = findViewById(R.id.edit_text); findViewById(R.id.button).setOnClickListener(v -> { }); }a }b

public class InputActivity extends Activity { @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_input); final EditText editText = findViewById(R.id.edit_text); findViewById(R.id.button).setOnClickListener(v -> { Intent intent = new Intent(InputActivity.this, OutputActivity.class); intent.putExtra(EXTRA_SOME_INPUT, editText.getText().toString()); }); }a }b

public class InputActivity extends Activity { @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_input); final EditText editText = findViewById(R.id.edit_text); findViewById(R.id.button).setOnClickListener(v -> { Intent intent = new Intent(InputActivity.this, OutputActivity.class); intent.putExtra(EXTRA_SOME_INPUT, editText.getText().toString()); InputActivity.this.startActivity(intent); }); }a }b

public class InputActivity extends Activity { @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_input); final EditText editText = findViewById(R.id.edit_text); findViewById(R.id.button).setOnClickListener(v -> { Intent intent = new Intent(InputActivity.this, OutputActivity.class); intent.putExtra(EXTRA_SOME_INPUT, editText.getText().toString()); InputActivity.this.startActivity(intent); }); }a }b

public class OutputActivity extends Activity { OutputPresenter presenter; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); }a }c

public class OutputActivity extends Activity { OutputPresenter presenter; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); String inputText = getIntent().getStringExtra(EXTRA_SOME_INPUT); presenter = new OutputPresenter(inputText); }a }c

public class OutputActivity extends Activity { @Inject OutputPresenter presenter; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); String inputText = getIntent().getStringExtra(EXTRA_SOME_INPUT); }a }c

public class OutputActivity extends Activity { @Inject OutputPresenter presenter; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); String inputText = getIntent().getStringExtra(EXTRA_SOME_INPUT); presenter.setInputText(inputText); }a }c

public class OutputActivity extends Activity { @Inject OutputPresenter presenter; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); String inputText = getIntent().getStringExtra(EXTRA_SOME_INPUT); presenter.setInputText(inputText); }a @Override protected void onStart() { super.onStart(); presenter.onStart(); } }c

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public class BundleService { private final Bundle data; public BundleService() { data = new Bundle(); }c public Object get(String key) { return data.get(key); }d public Bundle getAll() { return data; }f }e

public class BundleService { private final Bundle data; public BundleService(@Nullable Bundle savedState) { data = new Bundle(); if (savedState != null) { data.putAll(savedState); }a }c public Object get(String key) { return data.get(key); }d public Bundle getAll() { return data; }f }e

public class BundleService { private final Bundle data; public BundleService(@Nullable Bundle savedState, @Nullable Bundle intentExtras) { data = new Bundle(); if (savedState != null) { data.putAll(savedState); }a if (intentExtras != null) { data.putAll(intentExtras); }b }c public Object get(String key) { return data.get(key); }d public Bundle getAll() { return data; }f }e

public class BundleService { private final Bundle data; public BundleService(@Nullable Bundle savedState, @Nullable Bundle intentExtras) { data = new Bundle(); if (savedState != null) { data.putAll(savedState); }a if (intentExtras != null) { data.putAll(intentExtras); }b }c public Object get(String key) { return data.get(key); }d public Bundle getAll() { return data; }f }e

public abstract class BaseActivity extends Activity { private BundleService bundleService; @Override public void onCreate(@Nullable Bundle savedInstanceState) { bundleService = new BundleService(savedInstanceState, getIntent().getExtras()); super.onCreate(savedInstanceState); }a }d

public abstract class BaseActivity extends Activity { private BundleService bundleService; @Override public void onCreate(@Nullable Bundle savedInstanceState) { bundleService = new BundleService(savedInstanceState, getIntent().getExtras()); super.onCreate(savedInstanceState); }a public BundleService getBundleService() { return bundleService; }b }d

public abstract class BaseActivity extends Activity { private BundleService bundleService; @Override public void onCreate(@Nullable Bundle savedInstanceState) { bundleService = new BundleService(savedInstanceState, getIntent().getExtras()); super.onCreate(savedInstanceState); }a public BundleService getBundleService() { return bundleService; }b @Override protected void onSaveInstanceState(Bundle outState) { outState.putAll(bundleService.getAll()); super.onSaveInstanceState(outState); }c }d

public abstract class BaseActivity extends Activity { private BundleService bundleService; @Override public void onCreate(@Nullable Bundle savedInstanceState) { bundleService = new BundleService(savedInstanceState, getIntent().getExtras()); super.onCreate(savedInstanceState); }a public BundleService getBundleService() { return bundleService; }b @Override protected void onSaveInstanceState(Bundle outState) { outState.putAll(bundleService.getAll()); super.onSaveInstanceState(outState); }c }d

@Module public abstract class BundleModule { @Provides static BundleService provideBundleService(BaseActivity activity) { return activity.getBundleService(); } }

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@Qualifier @Retention(RUNTIME) public @interface SomeInput {}a

@Qualifier @Retention(RUNTIME) public @interface SomeInput {}a @Module public abstract class BundleModule { public static final String EXTRA_SOME_INPUT = "SOME_INPUT"; @Provides static BundleService provideBundleService(BaseActivity activity) { return activity.getBundleService(); } @Provides @SomeInput static String provideSomeInput(BundleService bundleService) { String style = (String) bundleService.get(EXTRA_SOME_INPUT); return style == null ? "Null" : style; } }

class OutputPresenter { private final String inputText; OutputPresenter(String inputText) { this.inputText = inputText; }a void onStart() { repository.doSomeWork(inputText); }b }c

class OutputPresenter { private final String inputText; @Inject OutputPresenter(String inputText) { this.inputText = inputText; }a void onStart() { repository.doSomeWork(inputText); }b }c

class OutputPresenter { private final String inputText; @Inject OutputPresenter(@SomeInput String inputText) { this.inputText = inputText; }a void onStart() { repository.doSomeWork(inputText); }b }c

class OutputPresenter { private final String inputText; @Inject OutputPresenter(@SomeInput String inputText) { this.inputText = inputText; }a void onStart() { repository.doSomeWork(inputText); }b }c

public class OutputActivity extends BaseActivity { OutputPresenter presenter; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_output); String inputText = getIntent().getStringExtra(EXTRA_SOME_INPUT); presenter = new OutputPresenter(inputText); }a @Override protected void onStart() { super.onStart(); presenter.onStart(); }b }c

public class OutputActivity extends BaseActivity { OutputPresenter presenter; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_output); String inputText = getIntent().getStringExtra(EXTRA_SOME_INPUT); presenter = new OutputPresenter(inputText); }a @Override protected void onStart() { super.onStart(); presenter.onStart(); }b }c

public class OutputActivity extends BaseActivity { @Inject OutputPresenter presenter; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_output); String inputText = getIntent().getStringExtra(EXTRA_SOME_INPUT); presenter = new OutputPresenter(inputText); }a @Override protected void onStart() { super.onStart(); presenter.onStart(); }b }c

public class OutputActivity extends BaseActivity { @Inject OutputPresenter presenter; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_output); }a @Override protected void onStart() { super.onStart(); presenter.onStart(); }b }c

public class OutputActivity extends BaseActivity { @Inject OutputPresenter presenter; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_output); }a @Override protected void onStart() { super.onStart(); presenter.onStart(); }b }c

Fin Benoît Quenaudon @oldergod