Android - get INSTALL_NON_MARKET_APPS boolean -

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i trying around install_non_market_apps option has 2 different versions. pre-17 api level , 17+. null pointer exception when run this:

boolean unknownsource = false; if (build.version.sdk_int < 17) {     unknownsource = settings.secure.getint(null, settings.secure.install_non_market_apps, 0) == 1; } else {     unknownsource = settings.global.getint(null, settings.global.install_non_market_apps, 0) == 1; }

i believe api level 3 settings.system variable depreciated , changed on settings.secure , in api level 17 changed on settings.global.

also, believe method call requires context content resolver.

boolean unknownsource = false; if (build.version.sdk_int < 3) {     unknownsource = settings.system.getint(getcontentresolver(), settings.system.install_non_market_apps, 0) == 1; } else if (build.version.sdk_int < 17) {     unknownsource = settings.secure.getint(getcontentresolver(), settings.secure.install_non_market_apps, 0) == 1; } else {     unknownsource = settings.global.getint(getcontentresolver(), settings.global.install_non_market_apps, 0) == 1; }

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