Android事件处理

核心提示：", iev.code, *outKeycode, *outFlags, err); if (err != 0) { *outKeycode = 0; *outFlags = 0; } } else { *outKeycode = iev.code; } *outValue = iev.value; *out

", iev.code, *outKeycode, *outFlags, err); if (err != 0) { *outKeycode = 0; *outFlags = 0; } } else { *outKeycode = iev.code; } *outValue = iev.value; *outWhen = s2ns(iev.time.tv_sec) + us2ns(iev.time.tv_usec); return true; } else { if (res<0) { LOGW("could not get event (errno=%d)", errno); } else { LOGE("could not get event (wrong size: %d)", res); } continue; } } } } ... }

对于按键事件，调用 mDevices[i]->layoutMap->map进行映射。映射实际是由 KeyLayoutMap::map完成的，KeyLayoutMap类里读取配置文件qwerty.kl，由配置 文件 qwerty.kl 决定键值的映射关系。你可以通过修 改./development/emulator/keymaps/qwerty.kl来改变键值的映射关系。

JNI 函数

在 frameworks/base/services/jni/com_android_server_KeyInputQueue.cpp文 件中，向 JAVA提供了函数android_server_KeyInputQueue_readEvent，用于读 取输入设备事件。

C代码 < width="14" height="15" src="http://janla.javaeye.com/javascripts/syntaxhighlighter/clipboard_new.swf" pluginspage="http://www.macromedia.com/go/getflashplayer">

static jboolean

android_server_KeyInputQueue_readEvent(JNIEnv* env, jobject clazz,

jobject event)

{

gLock.lock();

sp hub = gHub;

if (hub == NULL) {

hub = new EventHub;

gHub = hub;

}

gLock.unlock();

int32_t deviceId;

int32_t type;

int32_t scancode, keycode;

uint32_t flags;

int32_t value;

nsecs_t when;

bool res = hub->getEvent(&deviceId, &type, &scancode, &keycode,

&flags, &value, &when);

env->SetIntField(event, gInputOffsets.mDeviceId, (jint)deviceId);

env->SetIntField(event, gInputOffsets.mType, (jint)type);

env->SetIntField(event, gInputOffsets.mScancode, (jint)scancode);

env->SetIntField(event, gInputOffsets.mKeycode, (jint)keycode);