Add @Nullable annotation to the parameter of Object.equals() methods.

Those annotations could be inferred by some tools (like Kotlin), but the
https://checkerframework.org/ doesn't check inherited annotations
complaining about all equals() invocations that get nullable argument.

The change was generated by running

find . -name \*.java | xargs sed -i 's/public boolean equals(Object /public boolean equals(@Nullable Object /'

in the frameworks/base directory and by automatically adding and
formatting required imports if needed. No manual edits.

Bug: 170883422
Test: Annotation change only. Should have not impact.
Exempt-From-Owner-Approval: Mechanical change not specific to any component.
Change-Id: I5eedb571c9d78862115dfdc5dae1cf2a35343580

1 files changed, 2 insertions, 1 deletions

diff --git a/framework/java/android/bluetooth/BluetoothAudioConfig.java b/framework/java/android/bluetooth/BluetoothAudioConfig.java
index 9591a70b05..4c8b8c11fb 100644
--- a/framework/java/android/bluetooth/BluetoothAudioConfig.java
+++ b/framework/java/android/bluetooth/BluetoothAudioConfig.java
@@ -16,6 +16,7 @@
 
 package android.bluetooth;
 
+import android.annotation.Nullable;
 import android.os.Parcel;
 import android.os.Parcelable;
 
@@ -39,7 +40,7 @@ public final class BluetoothAudioConfig implements Parcelable {
     }
 
     @Override
-    public boolean equals(Object o) {
+    public boolean equals(@Nullable Object o) {
         if (o instanceof BluetoothAudioConfig) {
             BluetoothAudioConfig bac = (BluetoothAudioConfig) o;
             return (bac.mSampleRate == mSampleRate && bac.mChannelConfig == mChannelConfig