1.Android 4.3引入的wm工具：
a.获取Android设备屏幕分辨率： adb shell wm size
b.获取android设备屏幕密度： adb shell wm density
Wm.java
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BaseCommand {
...
public void onShowUsage(PrintStream out) {
out.println(
"usage: wm [subcommand] [options]\n" +
" wm size [reset|WxH]\n" +
" wm density [reset|DENSITY]\n" +
" wm overscan [reset|LEFT,TOP,RIGHT,BOTTOM]\n" +
"\n" +
"wm size: return or override display size.\n" +
"\n" +
"wm density: override display density.\n" +
"\n" +
"wm overscan: set overscan area for display.\n"
);
}
public void onRun()
throws Exception {
mWm =
IWindowManager.Stub.asInterface(ServiceManager.checkService(
Context.WINDOW_SERVICE));
if (mWm ==
null) {
System.err.println(NO_SYSTEM_ERROR_CODE);
throw new AndroidException("Can't connect to window manager; is the system running?"
);
}
String op =
nextArgRequired();
if (op.equals("size"
)) {
runDisplaySize();
} else if (op.equals("density"
)) {
runDisplayDensity();
} else if (op.equals("overscan"
)) {
runDisplayOverscan();
} else {
showError("Error: unknown command '" + op + "'"
);
return;
}
}
private void runDisplaySize()
throws Exception {
String size =
nextArg();
int w, h;
if (size ==
null) {
Point initialSize =
new Point();
Point baseSize =
new Point();
try {
mWm.getInitialDisplaySize(Display.DEFAULT_DISPLAY, initialSize);
mWm.getBaseDisplaySize(Display.DEFAULT_DISPLAY, baseSize);
System.out.println("Physical size: " + initialSize.x + "x" +
initialSize.y);
if (!
initialSize.equals(baseSize)) {
System.out.println("Override size: " + baseSize.x + "x" +
baseSize.y);
}
} catch (RemoteException e) {
}
return;
} else if ("reset"
.equals(size)) {
w = h = -1
;
} else {
int div = size.indexOf('x'
);
if (div <= 0 || div >= (size.length()-1
)) {
System.err.println("Error: bad size " +
size);
return;
}
String wstr = size.substring(0
, div);
String hstr = size.substring(div+1
);
try {
w =
Integer.parseInt(wstr);
h =
Integer.parseInt(hstr);
} catch (NumberFormatException e) {
System.err.println("Error: bad number " +
e);
return;
}
}
try {
if (w >= 0 && h >= 0
) {
// TODO(multidisplay): For now Configuration only applies to main screen.
mWm.setForcedDisplaySize(Display.DEFAULT_DISPLAY, w, h);
} else {
mWm.clearForcedDisplaySize(Display.DEFAULT_DISPLAY);
}
} catch (RemoteException e) {
}
}
private void runDisplayDensity()
throws Exception {
String densityStr =
nextArg();
int density;
if (densityStr ==
null) {
try {
int initialDensity =
mWm.getInitialDisplayDensity(Display.DEFAULT_DISPLAY);
int baseDensity =
mWm.getBaseDisplayDensity(Display.DEFAULT_DISPLAY);
System.out.println("Physical density: " +
initialDensity);
if (initialDensity !=
baseDensity) {
System.out.println("Override density: " +
baseDensity);
}
} catch (RemoteException e) {
}
return;
} else if ("reset"
.equals(densityStr)) {
density = -1
;
} else {
try {
density =
Integer.parseInt(densityStr);
} catch (NumberFormatException e) {
System.err.println("Error: bad number " +
e);
return;
}
if (density < 72
) {
System.err.println("Error: density must be >= 72"
);
return;
}
}
try {
if (density > 0
) {
// TODO(multidisplay): For now Configuration only applies to main screen.
mWm.setForcedDisplayDensity(Display.DEFAULT_DISPLAY, density);
} else {
mWm.clearForcedDisplayDensity(Display.DEFAULT_DISPLAY);
}
} catch (RemoteException e) {
}
}
...
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