1.设置的源码-创建DisplayOutputManager实例
try {
mDisplayManagement = new DisplayOutputManager();
}catch (RemoteException doe) {
doe.printStackTrace();
}
2.设置的源码-设置分辨率
public void saveVideoMode(String videoMode){
Logger.d(TAG , "saveVideoMode, displayIntf = "+mMainDisplay_set+", videoMode = "+videoMode);
mDisplayManagement.setMode(mDisplayManagement.MAIN_DISPLAY,mMainDisplay_set, videoMode);
mDisplayManagement.setInterface(mDisplayManagement.MAIN_DISPLAY,mMainDisplay_set, true);
mUIHandler.postDelayed(new Runnable() {
@Override
public void run() {
mDisplayManagement.saveConfig();
}
}, 3000);
}
3.framework-DisplayOutputManager.java
public int saveConfig()
{
try {
return mService.saveConfig();
} catch (Exception e) {
Log.e(TAG, "Error save :" + e);
return -1;
}
}
public DisplayOutputManager() throws RemoteException {
IBinder b = ServiceManager.getService("display_device_management");
if(b == null) {
Log.e(TAG, "Unable to connect to display device management service! - is it running yet?");
return;
}
mWM = IWindowManager.Stub.asInterface(ServiceManager.checkService(
Context.WINDOW_SERVICE));
mService = IDisplayDeviceManagementService.Stub.asInterface(b);
try {
// Get main display interface
String[] display_iface = mService.listInterfaces(MAIN_DISPLAY);
if(DBG) Log.d(TAG, "main display iface num is " + display_iface.length);
if(display_iface != null && display_iface.length > 0) {
m_main_iface = new int[display_iface.length];
for(int i = 0; i < m_main_iface.length; i++) {
if(DBG) Log.d(TAG, display_iface[i]);
m_main_iface[i] = ifacetotype(display_iface[i]);
}
}
else
m_main_iface = null;
// Get aux display interface
display_iface = mService.listInterfaces(AUX_DISPLAY);
if(DBG) Log.d(TAG, "aux display iface num is " + display_iface.length);
if(display_iface != null && display_iface.length > 0) {
m_aux_iface = new int[display_iface.length];
for(int i = 0; i < m_aux_iface.length; i++) {
if(DBG) Log.d(TAG, display_iface[i]);
m_aux_iface[i] = ifacetotype(display_iface[i]);
}
}
else
m_aux_iface = null;
} catch (Exception e) {
Log.e(TAG, "Error listing Interfaces :" + e);
return;
}
}
4.framework-SystemServer.java
try {
Slog.i(TAG, "DisplayDeviceManagementService Service");
ServiceManager.addService(
"display_device_management",
new DisplayDeviceManagementService(context));
} catch (Throwable e) {
Slog.e(TAG, "Failure starting DisplayDeviceManagementService Service", e);
}
5.framework-DisplayDeviceManagementService.java
/**
* Constructs a new NetworkManagementService instance
*
* @param context Binder context for this service
*/
public DisplayDeviceManagementService(Context context) {
mContext = context;
if ("simulator".equals(SystemProperties.get("ro.product.device"))) {
return;
}
IntentFilter hdmiFilter = new IntentFilter();
hdmiFilter.addAction(ACTION_PLUGGED);
hdmiFilter.addAction(ACTION_CHANGE);
hdmiFilter.addAction("android.intent.action.DISPLAY_TOAST");
hdmiFilter.addAction(ACTION_TV_STANDBY);
mHdmiReceiver = new HdmiReceiver();
mContext.registerReceiver(mHdmiReceiver,hdmiFilter);
mConnector = new NativeDaemonConnector(
new DisplaydCallbackReceiver(), "displayd", 50, DISPLAYD_TAG, 160);
Thread thread = new Thread(mConnector, DISPLAYD_TAG);
thread.start();
if(DBG) Slog.d(TAG, "DisplayDeviceManagementService start");
}6.mk文件搜索displayd：find ./ -name "*.mk" | xargs grep -rn displayd
7.经过上一步搜索，/system/displayd/模块下搜索:grep -rn "saveConfig" ./
8.分析DisplayManager.cpp的saveConfig方法即可
void DisplayManager::saveConfig(void) {
FILE *fd = NULL;
struct displaynode *node;
char buf[BUFFER_LENGTH];
char tvdpi[BUFFER_LENGTH];
struct file_base_paramer base_paramer;
memset(&base_paramer,0,sizeof(base_paramer));
fd = fopen(DISPLAY_CONFIG_FILE, "w");
if(fd != NULL) {
for(node = main_display_list; node != NULL; node = node->next) {
memset(node->savemode, 0, MODE_LENGTH);
memcpy(node->savemode, node->mode, MODE_LENGTH);
memset(buf, 0 , BUFFER_LENGTH);
sprintf(buf, "display=%d,iface=%d,enable=%d,mode=%s\n", node->property, node->type, node->enable, node->mode);
fwrite(buf, 1, strlen(buf), fd);
}
for(node = aux_display_list; node != NULL; node = node->next) {
memset(node->savemode, 0, MODE_LENGTH);
memcpy(node->savemode, node->mode, MODE_LENGTH);
memset(buf, 0 , BUFFER_LENGTH);
sprintf(buf, "display=%d,iface=%d,enable=%d,mode=%s\n", node->property, node->type, node->enable, node->mode);
fwrite(buf, 1, strlen(buf), fd);
}
fflush(fd);
fclose(fd);
}
sync();
int file;
const char *baseparameterfile = GetBaseparameterFile();
if (!baseparameterfile) {
ALOGW("base paramter file can not be find");
return;
}
file = open(baseparameterfile, O_RDWR);
if (file < 0) {
ALOGW("base paramter file can not be opened");
return;
}
// caculate file's size and read it
unsigned int length = lseek(file, 0L, SEEK_END);
lseek(file, 0L, SEEK_SET);
if(length < sizeof(base_paramer)) {
ALOGE("BASEPARAME data's length is error\n");
close(file);
return;
}
read(file, (void*)&base_paramer, sizeof(file_base_paramer));
for(node = main_display_list; node != NULL; node = node->next) {
if(node->type == DISPLAY_INTERFACE_HDMI) {
if(node->mode) {
base_paramer.hdmi.type = node->type;
base_paramer.hdmi.interlaced = 0;
if (strstr(node->mode, "YCbCr420"))
base_paramer.hdmi.interlaced |= HDMI_VIDEO_YUV420;
if (strchr(node->mode, 'p')) {
sscanf(node->mode, "%dx%dp-%d",
&base_paramer.hdmi.xres,
&base_paramer.hdmi.yres,
&base_paramer.hdmi.refresh);
} else if (strchr(node->mode, 'i')) {
sscanf(node->mode, "%dx%di-%d",
&base_paramer.hdmi.xres,
&base_paramer.hdmi.yres,
&base_paramer.hdmi.refresh);
base_paramer.hdmi.interlaced |= 1;
} else if (strcmp(node->mode,"auto") == 0) {
base_paramer.hdmi.xres = 0;
base_paramer.hdmi.yres = 0;
base_paramer.hdmi.refresh = 0;
}
ALOGD("[%s] hdmi_mode %s\n", __FUNCTION__,node->mode);
}
} else if(node->type == DISPLAY_INTERFACE_TV) {
if(node->mode) {
sscanf(node->mode, "%dx%di-%d",
&base_paramer.tve.xres,
&base_paramer.tve.yres,
&base_paramer.tve.refresh);
base_paramer.tve.interlaced = 1;
ALOGD("[%s] tve_mode %s\n", __FUNCTION__,node->mode);
}
}
}
lseek(file, 0L, SEEK_SET);
write(file, (char*)(&base_paramer), sizeof(base_paramer));
close(file);
sync();
ALOGD("[%s] hdmi:%d,%d,%d,%d,%d,%d\n", __FUNCTION__,
base_paramer.hdmi.xres,
base_paramer.hdmi.yres,
base_paramer.hdmi.interlaced,
base_paramer.hdmi.type,
base_paramer.hdmi.refresh,
base_paramer.hdmi.reserve);
ALOGD("[%s] tve:%d,%d,%d,%d,%d,%d\n", __FUNCTION__,
base_paramer.tve.xres,
base_paramer.tve.yres,
base_paramer.tve.interlaced,
base_paramer.tve.type,
base_paramer.tve.refresh,
base_paramer.tve.reserve);
}
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