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[FragmentStrictMode] Detect calls to Fragment#setRetainInstance #140

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[FragmentStrictMode] Detect calls to Fragment#setRetainInstance #140

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35c1280
Add detection for calls to Fragment#setRetainInstance
simonschiller Mar 12, 2021
d13cb82
Extend check to getRetainInstance method
simonschiller Mar 15, 2021
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6 changes: 6 additions & 0 deletions fragment/fragment/api/public_plus_experimental_current.txt
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Expand Up @@ -461,6 +461,7 @@ package androidx.fragment.app.strictmode {

@RestrictTo(androidx.annotation.RestrictTo.Scope.LIBRARY) public final class FragmentStrictMode {
method public static androidx.fragment.app.strictmode.FragmentStrictMode.Policy getDefaultPolicy();
method @RestrictTo(androidx.annotation.RestrictTo.Scope.LIBRARY) public static void onRetainInstanceUsage(androidx.fragment.app.Fragment);
method @RestrictTo(androidx.annotation.RestrictTo.Scope.LIBRARY) public static void onSetUserVisibleHint(androidx.fragment.app.Fragment);
method public static void setDefaultPolicy(androidx.fragment.app.strictmode.FragmentStrictMode.Policy);
}
Expand All @@ -476,12 +477,17 @@ package androidx.fragment.app.strictmode {
@RestrictTo(androidx.annotation.RestrictTo.Scope.LIBRARY) public static final class FragmentStrictMode.Policy.Builder {
ctor public FragmentStrictMode.Policy.Builder();
method public androidx.fragment.app.strictmode.FragmentStrictMode.Policy build();
method public androidx.fragment.app.strictmode.FragmentStrictMode.Policy.Builder detectRetainInstanceUsage();
method public androidx.fragment.app.strictmode.FragmentStrictMode.Policy.Builder detectSetUserVisibleHint();
method public androidx.fragment.app.strictmode.FragmentStrictMode.Policy.Builder penaltyDeath();
method public androidx.fragment.app.strictmode.FragmentStrictMode.Policy.Builder penaltyListener(androidx.fragment.app.strictmode.FragmentStrictMode.OnViolationListener);
method public androidx.fragment.app.strictmode.FragmentStrictMode.Policy.Builder penaltyLog();
}

@RestrictTo(androidx.annotation.RestrictTo.Scope.LIBRARY) public final class RetainInstanceUsageViolation extends androidx.fragment.app.strictmode.Violation {
ctor public RetainInstanceUsageViolation();
}

@RestrictTo(androidx.annotation.RestrictTo.Scope.LIBRARY) public final class SetUserVisibleHintViolation extends androidx.fragment.app.strictmode.Violation {
ctor public SetUserVisibleHintViolation();
}
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6 changes: 6 additions & 0 deletions fragment/fragment/api/restricted_current.txt
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Expand Up @@ -487,6 +487,7 @@ package androidx.fragment.app.strictmode {

@RestrictTo(androidx.annotation.RestrictTo.Scope.LIBRARY) public final class FragmentStrictMode {
method public static androidx.fragment.app.strictmode.FragmentStrictMode.Policy getDefaultPolicy();
method @RestrictTo(androidx.annotation.RestrictTo.Scope.LIBRARY) public static void onRetainInstanceUsage(androidx.fragment.app.Fragment);
method @RestrictTo(androidx.annotation.RestrictTo.Scope.LIBRARY) public static void onSetUserVisibleHint(androidx.fragment.app.Fragment);
method public static void setDefaultPolicy(androidx.fragment.app.strictmode.FragmentStrictMode.Policy);
}
Expand All @@ -502,12 +503,17 @@ package androidx.fragment.app.strictmode {
@RestrictTo(androidx.annotation.RestrictTo.Scope.LIBRARY) public static final class FragmentStrictMode.Policy.Builder {
ctor public FragmentStrictMode.Policy.Builder();
method public androidx.fragment.app.strictmode.FragmentStrictMode.Policy build();
method public androidx.fragment.app.strictmode.FragmentStrictMode.Policy.Builder detectRetainInstanceUsage();
method public androidx.fragment.app.strictmode.FragmentStrictMode.Policy.Builder detectSetUserVisibleHint();
method public androidx.fragment.app.strictmode.FragmentStrictMode.Policy.Builder penaltyDeath();
method public androidx.fragment.app.strictmode.FragmentStrictMode.Policy.Builder penaltyListener(androidx.fragment.app.strictmode.FragmentStrictMode.OnViolationListener);
method public androidx.fragment.app.strictmode.FragmentStrictMode.Policy.Builder penaltyLog();
}

@RestrictTo(androidx.annotation.RestrictTo.Scope.LIBRARY) public final class RetainInstanceUsageViolation extends androidx.fragment.app.strictmode.Violation {
ctor public RetainInstanceUsageViolation();
}

@RestrictTo(androidx.annotation.RestrictTo.Scope.LIBRARY) public final class SetUserVisibleHintViolation extends androidx.fragment.app.strictmode.Violation {
ctor public SetUserVisibleHintViolation();
}
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19 changes: 19 additions & 0 deletions .../fragment/src/androidTest/java/androidx/fragment/app/strictmode/FragmentStrictModeTest.kt
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Expand Up @@ -128,6 +128,25 @@ public class FragmentStrictModeTest {
}
}

@Test
public fun detectRetainInstanceUsage() {
var violation: Violation? = null
val policy = FragmentStrictMode.Policy.Builder()
.detectRetainInstanceUsage()
.penaltyListener { violation = it }
.build()
FragmentStrictMode.setDefaultPolicy(policy)

@Suppress("DEPRECATION")
StrictFragment().retainInstance = true
assertThat(violation).isInstanceOf(RetainInstanceUsageViolation::class.java)

violation = null
@Suppress("DEPRECATION")
StrictFragment().retainInstance
assertThat(violation).isInstanceOf(RetainInstanceUsageViolation::class.java)
}

@Test
public fun detectSetUserVisibleHint() {
var violation: Violation? = null
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2 changes: 2 additions & 0 deletions fragment/fragment/src/main/java/androidx/fragment/app/Fragment.java
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Expand Up @@ -1233,6 +1233,7 @@ public void onHiddenChanged(boolean hidden) {
*/
@Deprecated
public void setRetainInstance(boolean retain) {
FragmentStrictMode.onRetainInstanceUsage(this);
mRetainInstance = retain;
if (mFragmentManager != null) {
if (retain) {
Expand All @@ -1259,6 +1260,7 @@ public void setRetainInstance(boolean retain) {
*/
@Deprecated
final public boolean getRetainInstance() {
FragmentStrictMode.onRetainInstanceUsage(this);
return mRetainInstance;
}

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20 changes: 20 additions & 0 deletions fragment/fragment/src/main/java/androidx/fragment/app/strictmode/FragmentStrictMode.java
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Expand Up @@ -51,6 +51,7 @@ private enum Flag {
PENALTY_LOG,
PENALTY_DEATH,

DETECT_RETAIN_INSTANCE_USAGE,
DETECT_SET_USER_VISIBLE_HINT
}

Expand Down Expand Up @@ -142,6 +143,17 @@ public Builder penaltyListener(@NonNull OnViolationListener listener) {
return this;
}

/**
* Detects calls to #{@link Fragment#setRetainInstance} and
* #{@link Fragment#getRetainInstance()}.
*/
@NonNull
@SuppressLint("BuilderSetStyle")
public Builder detectRetainInstanceUsage() {
flags.add(Flag.DETECT_RETAIN_INSTANCE_USAGE);
return this;
}

/** Detects calls to #{@link Fragment#setUserVisibleHint}. */
@NonNull
@SuppressLint("BuilderSetStyle")
Expand Down Expand Up @@ -195,6 +207,14 @@ private static Policy getNearestPolicy(@Nullable Fragment fragment) {
return defaultPolicy;
}

@RestrictTo(RestrictTo.Scope.LIBRARY)
public static void onRetainInstanceUsage(@NonNull Fragment fragment) {
Policy policy = getNearestPolicy(fragment);
if (policy.flags.contains(Flag.DETECT_RETAIN_INSTANCE_USAGE)) {
handlePolicyViolation(fragment, policy, new RetainInstanceUsageViolation());
}
}

@RestrictTo(RestrictTo.Scope.LIBRARY)
public static void onSetUserVisibleHint(@NonNull Fragment fragment) {
Policy policy = getNearestPolicy(fragment);
Expand Down
24 changes: 24 additions & 0 deletions ...fragment/src/main/java/androidx/fragment/app/strictmode/RetainInstanceUsageViolation.java
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@@ -0,0 +1,24 @@
/*
* Copyright 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package androidx.fragment.app.strictmode;

import androidx.annotation.RestrictTo;

/** See #{@link FragmentStrictMode.Policy.Builder#detectRetainInstanceUsage()}. */
@RestrictTo(RestrictTo.Scope.LIBRARY) // TODO: Make API public as soon as we have a few checks
public final class RetainInstanceUsageViolation extends Violation {
}