Prefer std::string over String8

String8 is obsolete, only use std::string in the
input libraries now.

Bug: 64258224
Test: make, boot device, interact with UI
Change-Id: I0e610f8290438ab1e21e466288e3217015b49699
diff --git a/services/core/jni/com_android_server_input_InputManagerService.cpp b/services/core/jni/com_android_server_input_InputManagerService.cpp
index 21300ed..27c2fac 100644
--- a/services/core/jni/com_android_server_input_InputManagerService.cpp
+++ b/services/core/jni/com_android_server_input_InputManagerService.cpp
@@ -32,6 +32,7 @@
 #include <atomic>
 #include <cinttypes>
 #include <limits.h>
+#include <android-base/stringprintf.h>
 #include <android_runtime/AndroidRuntime.h>
 #include <android_runtime/Log.h>
 
@@ -65,6 +66,8 @@
 
 #define INDENT "  "
 
+using android::base::StringPrintf;
+
 namespace android {
 
 // The exponent used to calculate the pointer speed scaling factor.
@@ -198,7 +201,7 @@
 
     inline sp<InputManager> getInputManager() const { return mInputManager; }
 
-    void dump(String8& dump);
+    void dump(std::string& dump);
 
     void setVirtualDisplayViewports(JNIEnv* env, jobjectArray viewportObjArray);
     void setDisplayViewport(int32_t viewportType, const DisplayViewport& viewport);
@@ -240,7 +243,7 @@
     virtual void notifyConfigurationChanged(nsecs_t when);
     virtual nsecs_t notifyANR(const sp<InputApplicationHandle>& inputApplicationHandle,
             const sp<InputWindowHandle>& inputWindowHandle,
-            const String8& reason);
+            const std::string& reason);
     virtual void notifyInputChannelBroken(const sp<InputWindowHandle>& inputWindowHandle);
     virtual bool filterInputEvent(const InputEvent* inputEvent, uint32_t policyFlags);
     virtual void getDispatcherConfiguration(InputDispatcherConfiguration* outConfig);
@@ -347,28 +350,28 @@
     env->DeleteGlobalRef(mServiceObj);
 }
 
-void NativeInputManager::dump(String8& dump) {
-    dump.append("Input Manager State:\n");
+void NativeInputManager::dump(std::string& dump) {
+    dump += "Input Manager State:\n";
     {
-        dump.appendFormat(INDENT "Interactive: %s\n", toString(mInteractive.load()));
+        dump += StringPrintf(INDENT "Interactive: %s\n", toString(mInteractive.load()));
     }
     {
         AutoMutex _l(mLock);
-        dump.appendFormat(INDENT "System UI Visibility: 0x%0" PRIx32 "\n",
+        dump += StringPrintf(INDENT "System UI Visibility: 0x%0" PRIx32 "\n",
                 mLocked.systemUiVisibility);
-        dump.appendFormat(INDENT "Pointer Speed: %" PRId32 "\n", mLocked.pointerSpeed);
-        dump.appendFormat(INDENT "Pointer Gestures Enabled: %s\n",
+        dump += StringPrintf(INDENT "Pointer Speed: %" PRId32 "\n", mLocked.pointerSpeed);
+        dump += StringPrintf(INDENT "Pointer Gestures Enabled: %s\n",
                 toString(mLocked.pointerGesturesEnabled));
-        dump.appendFormat(INDENT "Show Touches: %s\n", toString(mLocked.showTouches));
-        dump.appendFormat(INDENT "Pointer Capture Enabled: %s\n", toString(mLocked.pointerCapture));
+        dump += StringPrintf(INDENT "Show Touches: %s\n", toString(mLocked.showTouches));
+        dump += StringPrintf(INDENT "Pointer Capture Enabled: %s\n", toString(mLocked.pointerCapture));
     }
-    dump.append("\n");
+    dump += "\n";
 
     mInputManager->getReader()->dump(dump);
-    dump.append("\n");
+    dump += "\n";
 
     mInputManager->getDispatcher()->dump(dump);
-    dump.append("\n");
+    dump += "\n";
 }
 
 bool NativeInputManager::checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) {
@@ -668,7 +671,7 @@
 }
 
 nsecs_t NativeInputManager::notifyANR(const sp<InputApplicationHandle>& inputApplicationHandle,
-        const sp<InputWindowHandle>& inputWindowHandle, const String8& reason) {
+        const sp<InputWindowHandle>& inputWindowHandle, const std::string& reason) {
 #if DEBUG_INPUT_DISPATCHER_POLICY
     ALOGD("notifyANR");
 #endif
@@ -680,7 +683,7 @@
             getInputApplicationHandleObjLocalRef(env, inputApplicationHandle);
     jobject inputWindowHandleObj =
             getInputWindowHandleObjLocalRef(env, inputWindowHandle);
-    jstring reasonObj = env->NewStringUTF(reason.string());
+    jstring reasonObj = env->NewStringUTF(reason.c_str());
 
     jlong newTimeout = env->CallLongMethod(mServiceObj,
                 gServiceClassInfo.notifyANR, inputApplicationHandleObj, inputWindowHandleObj,
@@ -1342,7 +1345,7 @@
     NativeInputManager* im = static_cast<NativeInputManager*>(data);
 
     ALOGW("Input channel object '%s' was disposed without first being unregistered with "
-            "the input manager!", inputChannel->getName().string());
+            "the input manager!", inputChannel->getName().c_str());
     im->unregisterInputChannel(env, inputChannel);
 }
 
@@ -1363,9 +1366,9 @@
     status_t status = im->registerInputChannel(
             env, inputChannel, inputWindowHandle, monitor);
     if (status) {
-        String8 message;
-        message.appendFormat("Failed to register input channel.  status=%d", status);
-        jniThrowRuntimeException(env, message.string());
+        std::string message;
+        message += StringPrintf("Failed to register input channel.  status=%d", status);
+        jniThrowRuntimeException(env, message.c_str());
         return;
     }
 
@@ -1390,9 +1393,9 @@
 
     status_t status = im->unregisterInputChannel(env, inputChannel);
     if (status && status != BAD_VALUE) { // ignore already unregistered channel
-        String8 message;
-        message.appendFormat("Failed to unregister input channel.  status=%d", status);
-        jniThrowRuntimeException(env, message.string());
+        std::string message;
+        message += StringPrintf("Failed to unregister input channel.  status=%d", status);
+        jniThrowRuntimeException(env, message.c_str());
     }
 }
 
@@ -1576,9 +1579,9 @@
 static jstring nativeDump(JNIEnv* env, jclass /* clazz */, jlong ptr) {
     NativeInputManager* im = reinterpret_cast<NativeInputManager*>(ptr);
 
-    String8 dump;
+    std::string dump;
     im->dump(dump);
-    return env->NewStringUTF(dump.string());
+    return env->NewStringUTF(dump.c_str());
 }
 
 static void nativeMonitor(JNIEnv* /* env */, jclass /* clazz */, jlong ptr) {