分辨率修改涉及两个概念：密度和尺寸

每个项目密度定义路径：

customize/customer_cfg/sp8810ga/res/system.prop

# 1 => add volume control in in-call screen

ro.sprd.volume_control_icon = 1

#LCD_Density for WGVA

ro.sf.lcd_density =240

dalvik.vm.heapsize=32m

ro.opengles.version=131072

搜索ro.sf.lcd_density关键字，

device/samsung/system.prop，vendor/sprd/hsdroid/system.prop

也有定义！

验证结果：

最终生成的build.prop文件

#LCD_Density for WVGA

ro.sf.lcd_density = 240

来自customize下的修改值！

手机目录system/build.prop通过adb导出来，

修改其中的值，再push进相应目录下的build.prop，重新开机，显示预先效果！

尺寸修改：

frameworks/base/core/java/android/content/res/CompatibilityInfo.java

publicstatic final int DEFAULT_PORTRAIT_WIDTH = 320;

publicstatic final int DEFAULT_PORTRAIT_HEIGHT = 480;

四组数据效果比较：

1)、正常效果：

DEFAULT_PORTRAIT_WIDTH = 320;DEFAULT_PORTRAIT_HEIGHT =480;ro.sf.lcd_density = 240;

2)、正常效果：

DEFAULT_PORTRAIT_WIDTH = 480;DEFAULT_PORTRAIT_HEIGHT =800;ro.sf.lcd_density = 240;

3)、界面显示正常，系列显示图标变小：

DEFAULT_PORTRAIT_WIDTH = 480;DEFAULT_PORTRAIT_HEIGHT =800;ro.sf.lcd_density = 160;

4)、部分界面显示不全(如锁)，系列显示图标变小：

DEFAULT_PORTRAIT_WIDTH = 320;DEFAULT_PORTRAIT_HEIGHT =480;ro.sf.lcd_density = 160;

结论：

ro.sf.lcd_density影响分辨率的关键因素，

目前四个等级的屏幕密度等级，

决定每个APK选取res下的不同资源文件。

如主流屏幕drawable-hdpi(密度240)、drawable-mdpi(密度160)等；

相关说明：

frameworks/base/core/java/android/util/DisplayMetrics.java

private static int getDeviceDensity() {

// qemu.sf.lcd_density can be used to overridero.sf.lcd_density

// when running in the emulator, allowing for dynamicconfigurations.

// The reason for this is that ro.sf.lcd_density is write-once andis

// set by the init process when it parses build.prop beforeanything else.

return SystemProperties.getInt("qemu.sf.lcd_density",

SystemProperties.getInt("ro.sf.lcd_density",DENSITY_DEFAULT));

}

frameworks/base/services/surfaceflinger/DisplayHardware/DisplayHardware.cpp

#

if(property_get("qemu.sf.lcd_density", property, NULL)<= 0) {

if (property_get("ro.sf.lcd_density", property, NULL)<= 0) {

LOGW("ro.sf.lcd_density not defined, using 160 dpi bydefault.");

strcpy(property, "160");

}

} else{

# mDpiX = mDpiY = atoi(property);

}

上面表示：

如果没有设置ro.sf.lcd_density的值，那么选择DENSITY_DEFAULT的默认定义；

再看DENSITY_DEFAULT定义处：

#

publicstatic final int DENSITY_LOW = 120;

#

publicstatic final int DENSITY_MEDIUM = 160;

#

publicstatic final int DENSITY_HIGH = 240;

#

publicstatic final int DENSITY_XHIGH = 320;

#     publicstatic final int DENSITY_DEFAULT = DENSITY_MEDIUM;