升级android app sdk

安装apk时出现：“此应用专为旧版Android打造，因此可能无法正常运行”

弹窗代码:AppWarnings.java

public void showDeprecatedTargetDialogIfNeeded(ActivityRecord r) {
    if (r.appInfo.targetSdkVersion < Build.VERSION.MIN_SUPPORTED_TARGET_SDK_INT) {
        mUiHandler.showDeprecatedTargetDialog(r);
    }
}

Build.VERSION.MIN_SUPPORTED_TARGET_SDK_INT值：

public static final int MIN_SUPPORTED_TARGET_SDK_INT = SystemProperties.getInt(
               "ro.build.version.min_supported_target_sdk", 0);

adb shell获取属性值:

getprop ro.build.version.min_supported_target_sdk

修改build.gradle: buildToolsVersion